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Acta Ichthyologica et Piscatoria
Journal Prestige (SJR): 0.303

Citation Impact (citeScore): 1
Number of Followers: 5

This is an Open Access Journal

Open Access journal
ISSN (Print) 0137-1592 - ISSN (Online) 1734-1515
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[58 journals]

Can stocking with advanced European grayling fry strengthen its
populations in the wild'
- Abstract: Acta Ichthyologica et Piscatoria 54: 165-176
  DOI : 10.3897/aiep.54.124289
  Authors : Mladen Avramović, Jan Turek, Pavel Lepič, Mariusz Szmyt, Jan Pastejřík, Tomáš Randák : European grayling, Thymallus thymallus (Linnaeus, 1758) (Actinopterygii: Salmoniformes: Salmonidae), represents one of the highly attractive riverine fishing species in Europe. Its populations have declined in the Czech Republic due to various adverse factors. Current approaches for strengthening these populations based on restocking with artificially reared 1+ or 2+ old individuals have proven to be ineffective. This study focuses on the possibilities of supporting or restoring these populations by reintroducing two-month-old, fast-growing fry reared in ponds. In June 2021, 5400 advanced fry marked with Alizarin Red (ARS) were introduced into three free-flowing South Bohemian streams. The recapture rates and biometric data (length and weight) of stocked grayling were assessed at the release sites as well as further downstream. The first electrofishing monitoring was conducted at the end of the growing season (October) and after their first winter (March). Water temperature and flow rate at the stocking sites were monitored throughout the growing season. The substantial number of recaptured individuals across all monitored sites suggests that the fry successfully adapted to their new habitat and significantly contributed to the composition of local fish communities. Downstream movement of stocked fry correlated with lower water temperatures and higher flows. Our findings demonstrate that some introduced individuals successfully overwintered at all three reintroduction sites. Marking with ARS has proven to be a very effective non-invasive method of group marking juvenile fish and is suitable for monitoring stocking programs. The production and stocking of fast-growing advanced fry of European grayling is thus a promising strategy for revitalizing and strengthening the populations of this threatened fish in running waters. HTML XML PDF
  PubDate: Fri, 2 Aug 2024 13:54:32 +0300
Chilomycterus reticulatus (Actinopterygii: Tetraodontiformes: Diodontidae)
in the southern Sicilian waters, central Mediterranean Sea
- Abstract: Acta Ichthyologica et Piscatoria 54: 157-163
  DOI : 10.3897/aiep.54.121303
  Authors : Bruno Zava, Maria Corsini-Foka, Danilo Scannella, Gianni Insacco, Alan Deidun, Valentina Crobe, Fausto Tinti : A recently discovered fish specimen representing the family Diodontidae has been documented in the waters off Mazara del Vallo in southwest Sicily, Italy. A detailed description of the morphological and meristic characteristics of the specimen is reported. Molecular identification was performed through sequence analysis of the Cytochrome Oxidase subunit I (COI). The specimen was identified as Chilomycterus reticulatus (Linnaeus, 1758) both morphologically and genetically. The finding marks the third confirmed record of Chilomycterus reticulatus in the Mediterranean Sea and Italian waters. The significance of the presence of this uncommon fish in the basin is briefly discussed, shedding light on its occurrence and potential implications. HTML XML PDF
  PubDate: Fri, 19 Jul 2024 15:44:44 +030
Records of Isistius sp. (Elasmobranchii: Squaliformes: Dalatiidae), from
the Azores archipelago, inferred by fresh bite marks in dolphins
- Abstract: Acta Ichthyologica et Piscatoria 54: 151-155
  DOI : 10.3897/aiep.54.123825
  Authors : Luís M. D. Barcelos, João B. Barreiros, João P. Barreiros : The marine waters around the Azores archipelago have been studied for quite a long time. Deeper areas, however, were historically poorly accessible and only now previously unreported species are recorded regularly. Our monitoring efforts of the Azorean ichthyofauna have recently revealed two cases of indirect evidence of the presence of a cookiecutter shark (Isistius sp.). The evidence, documented photographically, was in the form of explicit bite marks on two dolphins representing two separate species: the Atlantic spotted dolphin, Stenella frontalis (Cuvier, 1829) and the short-beaked common dolphin, Delphinus delphis Linnaeus, 1758. The two dolphins swam close to Terceira Island. No specimens have yet been collected. The shape, and size of the wounds observed suggest that they were inflicted by a cookiecutter shark. The fresh state of the injuries suggests they were sustained recently in the proximity of the Azores. HTML XML PDF
  PubDate: Mon, 1 Jul 2024 17:45:34 +0300
A new record of an armored searobin, Paraheminodus kamoharai
(Actinopterygii: Perciformes: Triglidae), from Taiwan, with a checklist of
peristediines (Peristediinae) from Taiwan
- Abstract: Acta Ichthyologica et Piscatoria 54: 131-137
  DOI : 10.3897/aiep.54.119501
  Authors : Yo Su, Ching-Feng Lin, Tah-Wei Chu : A single specimen of a rare species of armored searobin, Paraheminodus kamoharai Kawai, Imamura et Nakaya, 2004, is recorded from Taiwan, South China Sea, for the first time. While this particular species has been recorded in the Philippines and Japan, it has never been found in Taiwan. Therefore, our specimen fills the distribution gap of this species in the western Pacific Ocean. A detailed description of the specimen is provided and compared to the data of type specimens. Additionally, a checklist of species recorded from Taiwan is provided. Currently, 20 peristediine species under six genera are recorded from Taiwan’s EEZ. HTML XML PDF
  PubDate: Fri, 14 Jun 2024 14:27:08 +030
Additional records of the little sleeper shark, Somniosus rostratus
(Elasmobranchii: Squaliformes: Somniosidae), in Mediterranean Sea
- Abstract: Acta Ichthyologica et Piscatoria 54: 139-150
  DOI : 10.3897/aiep.54.121813
  Authors : Gianni Insacco, Bruno Zava, Filippo Spadola, Danilo Scannella, Alan Deidun, Franco Cigala-Fulgosi, Massimiliano Valastro, Antonio Di Natale, Corrado Piccinetti, Maria Corsini-Foka : This study investigates the distribution and morphometrics of the little sleeper shark, Somniosus rostratus (Risso, 1827), in the Mediterranean Sea. Ten sharks caught as bycatch between 2009 and 2019 in the northern sectors of the Strait of Sicily, the south Tyrrhenian Sea, the northwestern Ionian Sea, and the south Adriatic Sea using drifting longlines, as well as five retrieved from the Tripoli (Libya) marketplace, were morphologically confirmed to represent S. rostratus. The sharks exhibited typical characteristics for this species and were all caught from deep waters, indicating a potential mesopelagic habit. The study also utilized literature reviews and global databases for a comprehensive mapping of S. rostratus distribution in the Mediterranean Sea, which revealed sporadic occurrences in the eastern Mediterranean and an absence in the north Adriatic Sea. Morphometric data provided insights into the reproductive characteristics of S. rostratus. The study highlights the ecological significance of the Strait of Sicily (Central Mediterranean Sea) for the species, indicating it as a likely spawning area, and underscores the impact of the interactions between sharks and pelagic drifting swordfish fisheries in the Mediterranean, which result in increased mortality rates for threatened shark and ray species. Prioritizing conservation measures for endangered elasmobranch populations is crucial for maintaining marine ecosystem balance and ensuring fishery resource sustainability. HTML XML PDF
  PubDate: Fri, 14 Jun 2024 14:26:48 +030
Discovery of a ribbon goby, Oxymetopon compressus (Actinopterygii:
Gobiiformes: Microdesmidae) in Indian waters: A new westernmost record for
the genus Oxymetopon
- Abstract: Acta Ichthyologica et Piscatoria 54: 125-129
  DOI : 10.3897/aiep.54.118272
  Authors : Sivakumar Ragul, Gopalan Mahadevan, Arumugam Murugan, Ronald Fricke : In October 2023, a single specimen of Oxymetopon compressus Chan, 1966 was retrieved from a discarded catch at the Mudasal Odai fish landing center on the southeast coast of India. This study marks the first record of the genus Oxymetopon in Indian waters, accompanied by a novel maximum length record. Oxymetopon compressus, closely resembles its congener, Oxymetopon formosum Fourmanoir, 1967 in having low supraorbital crest and head markings, but differs in having relatively a higher number of anal fin rays, 29 (vs. 27 in O. formosum). The anal fin count of O. compressus (29) is found higher than the Oxymetopon curticauda Prokofiev, 2016 (21–23) and Oxymetopon filamentosum Fourmanoir, 1967 (26), whereas it is found lower than the Oxymetopon cyanoctenosum Klausewitz et Condé, 1981 and Oxymetopon typus Bleeker, 1861 (31). This study describes the distinctive morphological and coloration patterns of the recorded species. HTML XML PDF
  PubDate: Tue, 28 May 2024 17:51:25 +030
New report and range extension of invasive suckermouth armored catfishes
of the genus Pterygoplichthys (Actinopterygii: Siluriformes: Loricariidae)
in the Yucatan Peninsula
- Abstract: Acta Ichthyologica et Piscatoria 54: 109-114
  DOI : 10.3897/aiep.54.117474
  Authors : Miriam Soria-Barreto, Demián Hinojosa-Garro, Jesús Elías García-López, Ricardo Efraín Góngora Chin : Commonly known as suckermouth armored catfishes or pleco, Pterygoplichthys spp. are a group of invasive fishes that are widely distributed in several countries, including Mexico. This paper reports the first records of suckermouth armored catfishes in the Candelaria River, thereby expanding its distribution within the Yucatan Peninsula. Fifteen individuals were collected from three sites in the upper and middle parts of the basin. They represented two phenotypically distinct species of catfishes: (vermiculate) Pterygoplichthys disjunctivus (Weber, 1991) and (spotted) Pterygoplichthys pardalis (Castelnau, 1855). Adults and juveniles were caught in lotic ecosystems in 2023 during the dry and rainy seasons. Results suggest that the invasive process of the Candelaria River is linked to the San Pedro River upper basin, in El Petén, Guatemala, through floodings enhanced by hurricanes, allowing these species to disperse. These records highlight the importance of connectivity between adjacent watersheds for the dispersal and expansion of these invasive fishes, mainly from rivers neighboring Guatemala. However, further research is necessary to explore the dynamics and connectivity between aquatic ecosystems and the possible mechanisms that promote the invasion of these fishes in this region. HTML XML PDF
  PubDate: Mon, 20 May 2024 20:48:38 +030
First records of two species of snake eels, Aplatophis chauliodus and
Ophichthus hyposagmatus (Actinopterygii: Anguilliformes: Ophichthidae),
from Mexico
- Abstract: Acta Ichthyologica et Piscatoria 54: 103-108
  DOI : 10.3897/aiep.54.119085
  Authors : Luis Fernando Del Moral-Flores, Armando T. Wakida-Kusunoki, Rafael Ramos-Hernández, Arturo George-Zamora : We report herewith the presence of two species of rare snake eels, Aplatophis chauliodus Böhlke, 1956 (499 mm in total length [TL]) and Ophichthus hyposagmatus McCosker et Böhlke, 1984 (486 mm TL), in Mexican waters of the Gulf of Mexico. Both species were caught using bottom longline at a depth of 50 to 100 m in sandy bottoms in Veracruz, Mexico. Both records are the first for Mexico and the westernmost in the Gulf of Mexico. HTML XML PDF
  PubDate: Mon, 20 May 2024 10:50:05 +030
Taxonomic characterization of five species of emperor fishes
(Actinopterygii: Eupercaria: Lethrinidae) based on external morphology,
- Abstract: Acta Ichthyologica et Piscatoria 54: 115-124
  DOI : 10.3897/aiep.54.118586
  Authors : Ehsan Damadi, Faezeh Yazdani Moghaddam, Mehdi Ghanbarifardi : Species of the genus Lethrinus, commonly referred to as emperor fishes, mainly distributed in the Indo–West Pacific, including the Persian Gulf and Gulf of Oman are poorly known. It is difficult to characterize them morphologically, as there are no distinguishing meristic features for the majority of species. We studied the morphological features of 65 specimens representing the genus Lethrinus to define and identify the species involved. Among the morphological characters commonly considered in this type of study, we also included new, previously undescribed characters. The results of Tukey’s post hoc HSD test for metric and meristic variables, which showed significant differences between species in ANOVA, indicate that most metric traits and the number of scale rows above the lateral line differ significantly among the five morphotypes distinguished. Principal component analysis (PCA) and discriminant function analysis (DFA) effectively showed the morphometric variation between these morphotypes. The characteristics of body depth, head length, pectoral fin length, and caudal fin length are the most distinguishing diagnostic at the species level. We determined that the collected fish specimens represented: Lethrinus borbonicus Valenciennes, 1830, Lethrinus crocineus Smith, 1959, Lethrinus lentjan (Lacepède, 1802), Lethrinus microdon Valenciennes, 1830, and Lethrinus nebulosus (Forsskål, 1775). We also confirmed their validity as distinct species. Notably, L. crocineus, previously known only from the western Indian Ocean (Africa and Socotra), is now reported for the first time from the Persian Gulf and the Gulf of Oman. Lastly, a distribution map for the Lethrinus species is included. HTML XML PDF
  PubDate: Mon, 20 May 2024 08:17:44 +030
First records of two siluriform fishes: Bagrichthys micranodus
(Actinopterygii: Siluriformes: Bagridae) and Pangasianodon hypophthalmus
(Pangasiidae) from Sumatra, Indonesia
- Abstract: Acta Ichthyologica et Piscatoria 54: 95-101
  DOI : 10.3897/aiep.54.119948
  Authors : Kunto Wibowo, Muslim Muslim, Muhammad Afrisal, Agus Priyadi, Ruby V. Kusumah, Lukman Lukman : A bagrid catfish, Bagrichthys micranodus Roberts, 1989, has been reliably reported only from Borneo Island, whereas a pangasiid catfish, Pangasianodon hypophthalmus (Sauvage, 1878), originally from the Mekong and Chao Phraya rivers, has been widely introduced for aquaculture throughout southeast Asia. However, an ichthyofaunal survey of Cala Lake, South Sumatra, disclosed significant distribution extensions for both species, that of B. micranodus being the first from a land mass other than Borneo Island. Additionally, P. hypophthalmus was recorded from a natural freshwater habitat, outside the controlled environments of aquaculture facilities. The specimens are described in detail and comparisons are made with closely related species. HTML XML PDF
  PubDate: Thu, 4 Apr 2024 14:27:21 +0300
A new species of Sarcotaces (Copepoda: Cyclopoida: Philichthyidae) from
Antimora rostrata (Actinopterygii: Gadiformes: Moridae)
- Abstract: Acta Ichthyologica et Piscatoria 54: 87-94
  DOI : 10.3897/aiep.54.108526
  Authors : Wojciech Piasecki, Geoffrey A. Boxshall : Parasitic copepods of the genus Sarcotaces occur in galls inside the skeletal musculature of fishes. The gall, hosting a highly metamorphosed drop-shaped female contains also a black fluid capable of staining the fish tissues during filleting. Their marine fish hosts are globally distributed and until recently, eight nominal species have been described from fish hosts representing eight fish families. Females are quite similar in their morphology, therefore the males are used for the species determination. The aim of this study was to provide a detailed morphological characterization of the Sarcotaces specimens found in muscles of the blue antimora, Antimora rostrata (Günther, 1878) originating from deep open waters of the Atlantic. The present paper describes and illustrates Sarcotaces antimori sp. nov. The new species differs from its congeners in the shape of the cephalothorax, relative proportions and structure of the caudal rami, and in the setal formula of the antennulae of the male. HTML XML PDF
  PubDate: Fri, 29 Mar 2024 14:46:15 +020
Dynamics of fish community structure in the Yeosu Coast, Korea: A
comprehensive analysis of daily set-net catch data during 2008–2022
- Abstract: Acta Ichthyologica et Piscatoria 54: 75-86
  DOI : 10.3897/aiep.54.112388
  Authors : Seong Yong Moon, Mi Hee Lee, Kyung-Mi Jung, Myung Sung Koo : This study focuses on the Yeosu Coast, a critical ecological and economic zone on the Korean Peninsula. We conducted a comprehensive analysis of fish data obtained from daily set nets for the period of 2008–2022 (excluding 2017) to investigate variations in fish composition and community structure over a 15-year period. The catches were characterized by a prevalence of warm-water fish species, reflecting the temperate and subtropical character of the Yeosu Coast. The total catch during the study period was 3210.8 tonnes, with 2010 and 2016 registering the highest and lowest catches, respectively. Our analysis identified sea surface temperature as a primary factor correlated with these changes in species composition. The two dominant species, Scomberomorus niphonius (Cuvier, 1832) and Engraulis japonicus Temminck et Schlegel, 1846 together accounted for a remarkable 78.9% of the total catch. Notably, the Shannon–Weaver diversity index values were lower in 2015 than in 2008, indicating potential shifts in the community structure. Our analysis identified sea surface temperature as the most dominant factor that influenced these changes in species composition. Furthermore, we highlight the significant threats posed by climate change and the increasing number of jellyfish challenging fisheries on the Yeosu Coast. These threats have the potential to result in diminished set-net catches and declining biodiversity within this valuable ecosystem. Our findings underscore the importance of monitoring and addressing these ecological shifts to ensure the long-term sustainability of Yeosu Coast fisheries. HTML XML PDF
  PubDate: Fri, 15 Mar 2024 14:42:32 +020
Reproductive features of data-deficient yellowfin snapper, Lutjanus
xanthopinnis (Actinopterygii: Eupercaria: Lutjanidae), from east-coast of
Peninsular Malaysia: Implications for sustainable fisheries management
- Abstract: Acta Ichthyologica et Piscatoria 54: 63-74
  DOI : 10.3897/aiep.54.112995
  Authors : Md Moshiur Rahman, Nur Asma Ariffin, Ying Giat Seah, Tun Nurul Aimi Mat Jaafar, Muhammad Hanif Fadzli, Ahasan Habib : Understanding the reproductive biology of fishes is crucial to making accurate and scientifically sound recommendations for fisheries management. The presently reported study is the first to report the reproductive characteristics of the data-deficient and recently described yellowfin snapper, Lutjanus xanthopinnis Iwatsuki, Tanaka et Allen, 2015, collected from the eastern South China Sea, Malaysia. A total of 572 fish specimens were sampled monthly from March 2022 to April 2023 using a gillnet and a trawl net. Subsequently, these specimens were measured and weighed. Their total length (TL) ranged from 15.3 to 26.8 cm (19.25 ± 2.04 cm; mean ± SD). Their body weight (WB) ranged from 53.5 g to 279.7 g (114.5 ± 40.3 g; mean ± SD). For the reproductive biology study, the following parameters were determined: the sex ratio, gonadosomatic index (GSI), hepatosomatic index (HSI), spawning period, fecundity, condition factor (K), length at maturity, and the gonadal maturity stages. In the sex ratio, males (M) were significantly dominant over females (F) (M:F = 1:0.75) (χ2 = 11.18). Consequently, the monthly mean GSI of pooled sex revealed a consistent trend from January to August, indicating spawning seasons with peak periods in March and April. The batch fecundity of 67 mature females (16.0–25.2 cm TL; 64.5– 279.3 g W), was determined to range from 16 405 to 94 357 oocytes. The fecundity increased with gonad weight in contrast to weight and length. The length at first maturity of females and males was 14.53 and 20.56 cm, respectively. Females matured earlier than males. Macroscopic and histological examination of gonads revealed monthly variation in the ratio of gonad stages for males and females. This study offers crucial data on the reproductive biology of L. xanthopinnis, which will help with sustainable fishery management in this area and can be used as a reference for the management of similar fish populations in other regions of the world. HTML XML PDF
  PubDate: Mon, 26 Feb 2024 18:14:07 +020
Identification of pen shells (Bivalvia: Ostreida: Pinnidae) collected off
northern Iloilo, Philippines using their morphological characters
- Abstract: Acta Ichthyologica et Piscatoria 54: 49-61
  DOI : 10.3897/aiep.54.112465
  Authors : Cheryl Jela, Harold M. Monteclaro, Nathaniel C. Añasco, Gerald F. Quinitio, Ricardo P. Babaran : This study describes morphological characteristics of pen shells collected along the coast of northern Iloilo, Philippines. A total of 380 pen shell individuals with intact shells and their adductor muscles were carefully examined and measured. Eleven species were studied, namely: Atrina pectinata (Linnaeus, 1767), Atrina inflata (Dillwyn, 1817), Atrina vexillum (Born, 1778), Atrina seminuda (Lamarck, 1819), Atrina rigida ([Lightfoot], 1786), Pinna bicolor Gmelin, 1791, Pinna atropurpurea Sowerby, 1825, Pinna deltodes Menke, 1843, Pinna muricata Linnaeus, 1758, Pinna incurva Gmelin, 1791, and Pinna nobilis Linnaeus, 1758. The species were identified based on the nine characteristics of the valve for the genus Pinna and eight for the genus Atrina. These characteristics were then correlated with their adductor muscles’ morphology. Analysis of variance revealed that the three most dominant species investigated under genus Atrina, namely Atrina pectinata, Atrina inflata, and Atrina vexillum, were found to be significantly different in the eight characters of the valve (P < 0.05). Moreover, three representative Pinna species, Pinna bicolor, Pinna atropurpurea, and Pinna deltodes, were significantly (P < 0.05) different based on shell width, dorsal posterior shell margin, sulcus width, and dorsal posterior margin to dorsal nacreous margin. The observed high correlation (P < 0.05) between adductor muscle properties and different shell length characteristics for five dominant species can be used as a predictor of growth and suggests that the increase in the size of adductor muscle correlates to the increase in the size of the mentioned shell characteristics. No previous study of this kind was conducted in the Philippines. This work provides relevant information for related biological research on other pen shell species and for the management of pen shell resources in northern Iloilo and, possibly, other regions in the world. HTML XML PDF
  PubDate: Mon, 19 Feb 2024 08:31:20 +020
Evaluation of large-scale marking with alizarin red S in different age
rainbow trout fry for nonlethal field identification
- Abstract: Acta Ichthyologica et Piscatoria 54: 43-48
  DOI : 10.3897/aiep.54.117547
  Authors : Jan Turek, Pavel Lepič, Adam Bořík, Petra Galicová, Petra Nováková, Mladen Avramović, Tomáš Randák : Fry of rainbow trout, Oncorhynchus mykiss (Walbaum, 1792), was subjected to one-hour and four hours immersion in Alizarin red S (ARS) bath 150 mg · L–1. The experiment involved seven age groups (40, 50, 60, 70, 80, 90, and 100 days) and was conducted to estimate the minimal age of salmonids for mass marking with ARS bath enabling subsequent effective, simple field nonlethal identification, based on fin rays checking. The fish were examined at the ages of 200 and 300 days. The results showed a high retention level of ARS traces in caudal fin rays ensured satisfactory visibility and quick detection. A success rate of marking detection was>90% at 200 and 300 days of age and the fish were immersed in ARS solution from 60 days of age (685°D). This treatment provided better results in fish bathed for four hours. Recognition of marks using a laser pointer and protective glasses was successful even in fish, with a 3.5–5.0 times length increase compared to the marking time. The results indicate a high potential for ARS marking and its field identification for juvenile salmonids, which can significantly expand the possibilities of field experiments. HTML XML PDF
  PubDate: Tue, 13 Feb 2024 07:07:37 +020
First Southern Hemisphere record of the longnosed stargazer, Ichthyscopus
lebeck (Actinopterygii: Perciformes: Uranoscopidae)
- Abstract: Acta Ichthyologica et Piscatoria 54: 37-41
  DOI : 10.3897/aiep.54.113513
  Authors : Gino V. Limmon, Kunto Wibowo, Teguh Peristiwady, Ruby V. Kusumah, Muhammad Afrisal : Two specimens (290.2 and 309.5 mm in standard length) of the longnosed stargazer, Ichthyscopus lebeck (Bloch et Schneider, 1801), were recently collected from Jakarta Bay, Jakarta, Indonesia. Described more than two centuries ago, I. lebeck has hitherto been documented exclusively from the Northern Hemisphere, encompassing the Arabian Sea, southern coastal India, the Bay of Bengal, the Andaman Sea, and Singapore. The present paper documents the first record of the species in the Southern Hemisphere. Detailed descriptions of these specimens are provided, contributing valuable insights into the characteristics of I. lebeck in the newly reported locality. HTML XML PDF
  PubDate: Mon, 5 Feb 2024 07:37:41 +0200
Relations between morphological traits and body weight of shortbelly eel,
Dysomma anguillare (Actinopterygii: Anguilliformes: Synaphobranchidae),
from coastal waters of Zhoushan, East China Sea, determined by
multivariate analyses
- Abstract: Acta Ichthyologica et Piscatoria 54: 27-36
  DOI : 10.3897/aiep.54.114014
  Authors : Ziyan Zhu, Tianyan Yang, Sige Wang : The shortbelly eel, Dysomma anguillare Barnard, 1923, is an essential component in the food chain of the marine ecosystem and plays an important role in nearshore fisheries and biodiversity in the East China Sea. In order to provide theoretical support for fishery resource assessment and sustainable utilization of D. anguillare, an important bycatch in the offshore area of China, the relations between morphological traits and body weight were investigated based on the measurement of 28 metric traits for the first time. The correlation analysis showed that 25 morphological traits were significantly (P < 0.05) correlated with the logarithm of body weight (lgX0), in which the correlation coefficient of the total length (X1) was the largest with the extremely high significance (P < 0.01). The optimum multiple regression equation of morphological traits was constructed after deleting redundant independent variables: lgX0 = 0.367 + 0.003X1 + 0.010X7 – 0.010X8 + 0.011X10 + 0.042X14 + 0.006X15 + 0.024X19 – 0.004X23. The total length (X1) had the highest positive direct relation with lgX0 (0.699), which was in accordance with the results of determinate coefficient analysis, while the indirect effect of body height (X7) through lower jaw length (X19) to lgX0 was the greatest. The gray correlation analysis indicated that body length (X2) and distance from snout to dorsal fin origin (X22) were the most closely related to body weight. The comprehensive comparison showed that X1, X2, and X22 should be used as the ideal morphometric traits for measuring the body weight of D. anguillare, and the conclusions obtained from this study will provide valuable references for fishery resource management of this commercial fish species. HTML XML PDF
  PubDate: Wed, 31 Jan 2024 18:13:31 +020
First record of Triacanthidae Bleeker, 1859 (Actinopterygii:
Tetraodontiformes) from the Red Sea
- Abstract: Acta Ichthyologica et Piscatoria 54: 21-25
  DOI : 10.3897/aiep.54.115071
  Authors : M. P. Goutham-Bharathi, T. K. Sirajudheen, Ronald Grech Santucci, Ronald Fricke, Mark Dimech : The Tetraodontiform family Triacanthidae Bleeker, 1859 is recorded for the first time from the Red Sea. Fishing experiments employing a commercial shrimp trawler off Jizan, Saudi Arabia, revealed species occurrences of short-nosed tripodfish, Triacanthus biaculeatus (Bloch, 1786) at depths ranging from about 11 to 34 m. Currently, this species has only been found in shallow sandy/muddy habitats in the southern Red Sea. Further surveys are imperative to demonstrate the actual distribution of short-nosed tripodfish across a wider range of environmental gradients along the Red Sea. HTML XML PDF
  PubDate: Mon, 29 Jan 2024 14:39:31 +020
Genetic diversity of three consecutive selective breeding generations in
Pseudobagrus vachellii (Actinopterygii: Siluriformes: Bagridae)
- Abstract: Acta Ichthyologica et Piscatoria 54: 13-20
  DOI : 10.3897/aiep.54.105627
  Authors : Huan Wang, Guoqing Duan, Huaxing Zhou : Pseudobagrus vachellii (Richardson, 1846) is a commercially important freshwater fish species in China. To understand the effects of artificial breeding on the genetic diversity of three consecutive P. vachellii breeding populations (F1, F2, and F3) since 2012, a genetic analysis was conducted using polymorphic microsatellite markers. The mean allele number, expected heterozygosity, observed heterozygosity, and the polymorphic information content from generation F1 to F3 decreased from 7.75 to 5.63, from 0.77 to 0.63, from 0.83 to 0.77, and from 0.72 to 0.58, respectively. Analysis of molecular variance showed greater genetic divergence within the three generations (93.67%) than that among the generations (6.33%), and the overall differentiation level was moderate. Additionally, the lowest genetic differentiation was between F2 and F3 (Fst = 0.0484), and the highest was between F1 and F3 (Fst = 0.12864). Inbreeding occurred in each generation and was the highest in generation F3. Structural analysis showed that the three P. vachellii generations were most likely divided into two different genetic clusters. Although genetic diversity declined slightly in the mass selection lines after three breeding generations, overall genetic diversity was maintained at a relatively high level. To minimize the loss of genetic diversity and inbreeding in the subsequent breeding process, a moderate number of parents can be used for each generation. Information regarding the genetic diversity and structure of the selective P. vachellii breeding generations obtained in this study will be useful for future broodstock management and selective breeding programs. HTML XML PDF
  PubDate: Mon, 29 Jan 2024 14:37:50 +020
Feeding habits of Pacific anchovy, Engraulis japonicus (Actinopterygii:
Clupeiformes: Engraulidae), captured off the southern coasts of Korea
- Abstract: Acta Ichthyologica et Piscatoria 54: 1-11
  DOI : 10.3897/aiep.54.109601
  Authors : Seong Yong Moon, Heeyong Kim : Understanding the feeding ecology of anchovies in the southern waters of Korea is crucial for improving ecosystem management. However, to date, few studies have examined seasonal changes in the diet of Pacific anchovy, Engraulis japonicus Temminck et Schlegel, 1846, in Korean waters, with the majority of these focusing on the larval and adult stages. The presently reported study provides updates on the feeding habits of E. japonicus off the southern coast of Korea. We analyzed 347 individuals. One-way analysis of similarity was performed to evaluate the differences in diet composition among size classes and seasons of E. japonicus, and correspondence analysis was conducted using the matrix of the percentage by number (%N) data for prey with occurrence of less than 10% to determine the distribution of prey across all size classes and each season. The diet of E. japonicus was investigated according to season and four size classes. The fork length of these specimens ranged from 5.4 to 14.1 cm. A total of 55 prey taxa of varying sizes between 0.33 mm (diatom Coscinodiscus spp.) and 5.8 mm (fish larvae) were recorded. Anchovies were exclusively planktivorous, and copepods were the most common prey, comprising 82.1% of the identified food items and 84.3% of anchovy stomach contents analyzed. However, their occurrence and abundance varied according to season and Pacific anchovy size class. According to the percentage of the index of relative importance (%IRI), the most important prey items were the copepods Calanus sinicus (48.0%), Paracalanus orientalis (31.7%), bivalve larvae (5.8%), Ditrichocorycaeus affinis (4.2%), and calanoid copepods (2.4%). Analysis of similarities and similarity percentage analysis indicated that a distinct diet of Pacific anchovy in the southern waters of Korea is potentially driven by differences in hydrological conditions. Correspondence analysis revealed that anchovies had the most significant impact on the differences between size classes. The results deepen our understanding of prey species diversity and intraspecific food competition off the southern coast of Korea. HTML XML PDF
  PubDate: Thu, 18 Jan 2024 14:19:43 +020

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