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  Subjects -> WATER RESOURCES (Total: 160 journals)
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Aquatic Science and Technology
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2168-9148
Published by Macrothink Institute Homepage  [47 journals]
  • Reviewer Acknowledgements

    • Authors: Maggie Liu
      Abstract: Aquatic Science and Technology (AST) would like to acknowledge the following reviewers for their assistance with peer review of manuscripts for this issue. Many authors, regardless of whether AST publishes their work, appreciate the helpful feedback provided by the reviewers. Their comments and suggestions were of great help to the authors in improving the quality of their papers. Each of the reviewers listed below returned at least one review for this issue.Reviewers for Volume 9, Number 2Analía Ale, Instituto Nacional de Limnologia (CONICET, UNL), ArgentinaIgor Z. Zubrzycki, Hanyang University, PolishTai-Sheng Cheng, National University of Taiwan, Taiwan Maggie LiuAquatic Science and TechnologyMacrothink Institute*************************************5348 Vegas Dr.#825Las Vegas, Nevada 89108United StatesTel: 1-702-953-1852 ext. 524Fax: 1-702-420-2900E-mail 1: ast@macrothink.orgE-mail 2: ast@macrothink.comWebsite: http://ast.macrothink.org
      PubDate: Wed, 30 Jun 2021 00:00:00 -070
       
  • Age, Growth, and Natural Mortality of Whitebone Porgy, Calamus Leucosteus,
           From the Southeastern United States

    • Authors: Michael L. Burton; Jennifer C. Potts, Ariel Poholek, Jordan Page, Dalton Knight
      Abstract: Ages of whitebone porgy (Calamus leucosteus) (n = 559) from southeastern U. S. commercial and recreational fisheries from 1975 – 2017 were determined using sectioned otoliths. Opaque zones were annular, forming April – July (peaking in June). Ages ranged from 2 – 19 years, and the largest fish measured 513 mm TL (total length, mm). Body size relationships were: TL = 1.09 FL + 16.07 (n = 469, r2 = 0.97), FL = 0.89 TL – 6.39 (n= 469, r2 = 0.97), W = 2.8 x 10-5 TL2.91 (n = 462), and W = 6.8 x 10-5 FL2.82 (n = 417) where W is total weight (grams, g) and FL is fork length (mm). The von Bertalanffy growth equations were Lt = 365 (1 - e-0.35 (t + 1.37)) (n = 559) for all areas combined, Lt = 365 (1 - e-0.55(t + 0.00)) (n = 185) for fish from North Carolina through Cape Canaveral, Florida, and Lt = 368 (1 - e-0.25 (t + 2.51)) (n = 374) for fish from southeast Florida. Mean size-at-age was significantly different between regions for ages 4 – 9, (92% of total samples). Point estimates of natural mortality were M = 0.22 and M = 0.30 for northern- and southern-region fish, respectively, while age-specific estimates of M were 0.85 – 0.55 y-1 for ages 2– 19 for the northern region and 0.41 – 0.26 (ages 2-14) for southern region fish. This study presents updated life history parameters for whitebone porgy from the Atlantic waters off the southeastern United States.
      PubDate: Thu, 25 Mar 2021 03:43:30 -070
       
  • Evaluating the Potential for Rearing Walleye in Lined Ponds Filled with
           Well Water

    • Authors: Matthew J. Ward; Nathan A. Pool, Chad R. Haabala, Ryan A. Rasmus
      Abstract: Walleye (Sander vitreus) fingerlings (30 to 35 mm) are commonly reared in ponds filled with surface (i.e., lake) water, but the use of ground (i.e., well) water would provide increased biosecurity. We assessed the potential for using well water to rear walleye by comparing plankton and water quality over 30 days between organically fertilized lined ponds that were filled with either unfiltered lake or well water. All ponds were inoculated with plankton that originated from Blue Dog Lake, filled by May 15, 2020, and remained fishless. Zooplankton density and body size were consistently reduced in well ponds suggesting that fry survival and growth would be reduced. Initially, well ponds exhibited higher ammonia-nitrogen and alkalinity, but lower pH owing to the inherent chemistry of the well water. Later, reduced ammonia-nitrogen combined with increased dissolved oxygen and pH suggest that decomposition of the organic fertilizer occurred slower in well ponds. A phytoplankton bloom was successfully initiated but was difficult to maintain despite consistently lower zooplankton density in well ponds. While the use of well water would enhance biosecurity, these data suggest that walleye fingerling production would be reduced relative to lined ponds filled with productive, lake water. Increasing organic fertilizer, supplementing with liquid 28N:0P:0K, and/or filling ponds earlier (e.g., 30 days) may provide a more favorable environment for walleye culture in lined ponds filled with well water.
      PubDate: Fri, 19 Mar 2021 00:00:00 -070
       
  • Evaluation Study on the Growth Performance of Four Local Strains of Nile
           Tilabia (Oreochromis niloticus) in Sudan

    • Authors: Ahmed. M Musa; Elnuman. B. mohammed, Afra. A.Abd alla, Wael. m. Alfatih, Abdelgadir. M. manofal
      Abstract: The study was conducted at the fish farm of the Department of Fish Sciences, Faculty of Agricultural Technology and Fish Sciences, Al-Neelain University. The purpose of the study is to compare the growth performance of different local strains of Nile tilapia (Oreochromis niloticus) to provide the necessary information for conducting research leading to genetic improvement of the locally farmed Nile tilapia. Fish fry used in the study were spawned by brooders collected from, Jebel Aulia Dam Reservoir (White Nile strain A) , Sennar Dam Reservoir (Sennar strain B), Lake Nubia (Halfa strain C) and khashm elgirba reservoier( Khashm elgirba strain D). The study was conducted for six weeks in twelve happas, each stocked with 30 fry in three replicates for each strain, averaging 5 g. Fish were fed by diet with a protein level of 35%. Statistical analysis showed Sennar strain was the best growth rate with a percent weight gain of 1529%, followed by white nile strain with a percent weight gain of 1114%, followed by khashm elgerba strain with a percent weight gain of 993% and finally Halfa strain with a percent weight gain of 829%. Daily Growth Rate gain was 0.9g/day for sennar strain, followed by other strain with no significant(≥0.05). Food Conversion Ratios (FCR) were best in sennar and white nile strain ,survival rate with the same no significant(≥0.05) between treatments. finally results indicated that there is significant( ≤ 0.05) between treatments so sennar and white nile strains is better than two strains in this study.
      PubDate: Mon, 04 Jan 2021 00:00:00 -080
       
 
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