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	J. of Fisheries (Followers: 1)

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Journal of Fisheries
Number of Followers: 1

This is an Open Access Journal

Open Access journal
ISSN (Print) 2311-729X - ISSN (Online) 2311-3111
Published by BdFISH

[1 journal]

Pathology of systemic multiple bacterial infections and peritonitis in
hatchery-produced African catfish Clarias gariepinus (Burchell, 1822)
larvae
- Authors: Thangapalam Jawahar Abraham, Harresh Adikesavalu, Sayani Banerjee
  Pages: 101204 - 101204
  Abstract: Diseases are the major problems that have a significant impact on African catfish Clarias gariepinus seed production. This study reports the necropsy, microscopy, bacteriology and histopathology of diseased catfish larvae that experienced mass mortalities (>80%). The gill filaments of diseased larvae revealed no ectoparasites. The intestines had no parasitic association. About 35 – 40% of the dead larvae had ruptured abdomen. The affected larvae had abdominal haemorrhages and disintegrated intestine with marked degenerative and inflammatory changes, which indicated peritonitis. Bacteria including Aeromonas veronii, Edwardsiella tarda and Pseudomonas putida were isolated from the haemorrhagic exudates of diseased catfish larvae. Histopathology demonstrated dense melanomacrophage aggregates in the spleen. The intestine had extensive degeneration, basophilic margination and disintegration of the mucosal layer. The kidney section suggested a suppurative infection with necrosis of haematopoietic tissue, inflammation of the epithelial tissue, vacuolar degenerations and hypoplastic haematopoietic tissue. Aeromonas veronii and E. tarda immersion challenge at 5×106 cells mL–1 yielded no mortalities under laboratory conditions. Nevertheless, the hatchery management measures and the laboratory analyses supported peritonitis with systemic multiple bacterial infections in the observed large-scale motilities of excessively fed larvae.
  PubDate: 2022-02-20
  DOI: 10.17017/j.fish.300
  Issue No: Vol. 10, No. 1 (2022)
Some aspects of the reproductive biology of Labeo victorianus (Boulenger,
1901) from Kuja-Migori River basin, Kenya
- Authors: Elijah Kembenya, Albert Getabu, James Njiru, Reuben Omondi
  Pages: 101205 - 101205
  Abstract: Labeo victorianus is an endemic species to Lake Victoria basin and also a species threatened with extinction status. This study investigated reproductive biology of L. victorianus from Kuja- Migori River basin, Kenya with a view to determining the length weight relationship (LWR), condition factor, fecundity, egg diameter gonado-somatic index (GSI), length at 50% maturity (LM50) and sex ratio. Sampling was done by electrofishing from January 2018 to June 2019. The LWR showed a negative allometric pattern (p < 0.05). The mean condition factor for combined sexes was 1.02. Fecundity ranged from 47842 – 101902 eggs (mean ± SD: 83663 ± 2605 eggs) and correlated highly with body size (r2 = 0.9137). Egg diameter ranged from 0.5 – 0.7 mm. Mean GSI was 6.3 ± 1.6 and 2.8 ± 0.45 for females and males respectively. The LM50 was estimated at 18 cm total length (TL) and 20 cm TL for males and females respectively. Sex ratio did not differ from the expected 1:1. This species has a high fecundity with small sized eggs and males attain sexual maturity earlier than females. The findings of this study provide useful information towards sustainable conservation of L. victorianus in the Lake Victoria basin.
  PubDate: 2022-03-19
  DOI: 10.17017/j.fish.345
  Issue No: Vol. 10, No. 1 (2022)
Evaluation of the reproductive cycle and gonadal development in the
climbing perch, Anabas testudineus (Bloch, 1792) in captivity
- Authors: Chokki Veettil Priyatha, Kumari Chidambaran Chitra
  Pages: 101206 - 101206
  Abstract: The climbing perch Anabas testudineus, the most demanded indigenous fish species of India, were used for the evaluation of reproductive strategy and gonadal development at first maturation under the controlled laboratory condition. In both sexes, four distinct gonadal developmental stages namely preparatory, pre-spawning, spawning, and post-spawning were identified based on the gonadosomatic index (GSI), hepatosomatic index (HSI), gonadal morphology, and the levels of serum sex hormones. The spawning stage was identified from July and August and the fecundity ranged from 6500–11000 eggs. The GSI exhibited a significant increase from preparatory to pre-spawning and spawning stages, and maintained high until August. The HSI was maintained the same during preparatory, pre-spawning, and spawning stages while increased in post-spawning stage in both sexes. Serum estrogen and testosterone levels increased significantly during pre-spawning, and spawning stages in both sexes. Fecundity showed a positive correlation with the length, weight, and ovary weight. Histological sections showed that male A. testudineus were group-synchronous spawners. Both sexes showed discrete reproductive cycles characterized by distinct changes in gonadal size, sex hormones and gonadal indices. This study will bridge the gap of insufficient knowledge to support the best practices suitable for the A. testudineus culture and survival under captivity.
  PubDate: 2022-03-24
  DOI: 10.17017/j.fish.364
  Issue No: Vol. 10, No. 1 (2022)
Phenotypic characterization, genetic analysis and antibiotic sensitivity
of Aeromonas hydrophila isolates causing dropsy in cultured Labeo rohita
from Punjab, Pakistan
- Authors: Fatima Sughra, Muhammad Hafeez-ur-Rehman, Farzana Abbas, Imran Altaf, Saira Razzaq, Sidra Kanwal, Muhammad Inayat, Iqra Anwer, Muhammad Akram
  Pages: 101207 - 101207
  Abstract: Motile Aeromonas septicemia (MAS) is a common freshwater fish disease and major threat to the aquaculture in Pakistan. The present study was carried out on suspected fish samples to isolate and characterize local strains of Aeromonas hydrophila, a key pathogen responsible for the said disease in aquacultured fishes. A total of ninety suspected fish specimens were collected from fish farms in Kasur, Okara and Gujranwala districts of Punjab, Pakistan from June 2018 to April 2019. The specimens were processed and A. hydrophila strains were isolated. The primary identification of sixty seven isolates were verified by colony morphology, microscopy and phenotypic characterization with ten biochemical reactions. The A. hydrophila strains of test samples were molecularly characterized by polymerase chain reaction (PCR) using 16S rRNA at desired size of 356bp. The PCR amplified product was subjected to DNA sequencing and phylogenetic analysis showed homology with related strains of Aeromonas spp. By antibiotic sensitivity test, the isolates were checked for nine antibiotics in which the pathogen was sensitive to four and resistant to five drugs. Results of genetic analysis confirmed strains as A. hydrophila which are useful to take preventive measures against the said disease.
  PubDate: 2022-03-25
  DOI: 10.17017/j.fish.382
  Issue No: Vol. 10, No. 1 (2022)
On the investigation of electroanaesthesia in Labeo rohita under DC and
PDC electric field
- Authors: Nabanita Chakraborty, Aakash De, Sandip Kumar Ghosh, Tarun Kumar De
  Pages: 101208 - 101208
  Abstract: This study investigates electroanaesthesia under Direct Current (DC) and three low frequency Pulsed Direct current (PDC) of 1 Hz, 3 Hz and 6 Hz in Labeo rohita. All the current types in this study were effective in anaesthetizing L. rohita with fast induction and rapid recovery period in all fishes. The threshold value of voltage gradient (V cm–1) for inducing anaesthesia was higher in DC than PDCs. Opercular movements were significantly lower during anaesthesia, significantly higher one minute after recovery in all current types and reduced significantly in DC, PDC 1 Hz and PDC 3 Hz after 10 min of recovery from anaesthesia. Blood glucose level returned to the near control values after 8 hours of exposure in all current types in this study. DC sharp rise and PDC 3Hz may be preferred for inducing anaesthesia considering the recommended criteria of anaesthetic induction and recovery time. Result of this study indicates that electroanaesthesia technique with fast induction and rapid recovery may proffer a cost effective, safe and ecofriendly alternative for aquaculture activities in L. rohita.
  PubDate: 2022-04-05
  DOI: 10.17017/j.fish.359
  Issue No: Vol. 10, No. 1 (2022)