Journal of Fisheries <p>The <em>Journal of Fisheries</em> is a double blind peer reviewed open access journal published by BdFISH that provides rapid publication of articles in all areas of fisheries science. The journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. All issues (full) of the <a title="Journal of Fisheries" href="" target="_blank" rel="noopener">Journal of Fisheries</a> are also available on <a title="Journal of Fisheries also availabel on BdFISH Document" href="" target="_blank" rel="noopener">BdFISH Document</a>.</p> <p><strong>Journal of Fisheries at a glance</strong></p> <ul> <li class="show">ISSN: 2311-3111 (Online) and 2311-729X (Print)</li> <li class="show">Year of launching: December, 2013</li> <li class="show">Editor-in-Chief: Professor M Nazrul Islam</li> <li class="show">Journal policy: Open Access, Peer Reviewed, Online First!</li> <li class="show">Article publishing cost: Free of cost</li> <li class="show">Journal issues: 3 issues in a year (April, August, and December), accepted article is published online as Online First! and will be included in the contents of the upcoming issue</li> <li class="show">Journal operation financed by: BdFISH</li> <li class="show">Web: <a title="Journal of Fisheries" href="" target="_blank" rel="noopener"></a></li> </ul> <p>&nbsp;</p> BdFISH, Department of Fisheries, University of Rajshahi, Rajshahi 6205, Bangladesh en-US Journal of Fisheries 2311-729X Microbiological assessment of Nile tilapia Oreochromis niloticus collected from different super shops and local market in Dhaka, Bangladesh <p>The present study was conducted to detect the bacterial contamination of Nile tilapia <em>Oreochromis niloticus</em> collected from super shops and local market of Bangladesh. The sample specimens were collected from three super shops in Dhaka city <em>viz.</em> Agora, Shwapno and Prince Bazar and one local market (Savar Bazar). Samples were analysed to determine some pathogenic bacterial genera through the isolation and enumeration from different organs. The isolates were identified as <em>Escherichia coli</em>, <em>Salmonella</em> spp., <em>Shigella</em> spp. and <em>Vibrio</em> spp. by conventional culture method, biochemical tests and PCR assay. Total Viable Bacterial Counts (TVBC) were also determined. Fishes were found to be contaminated within a range between 6×10<sup>4</sup> to 1.6×10<sup>6</sup> cfu g<sup>–1</sup>. The load of <em>E. coli</em> and <em>Shigella</em> spp. were higher than that of <em>Salmonella</em> spp. and <em>Vibrio</em> spp. in all the studied samples. The study concludes that more precautions are required for personnel hygiene during fish processing and handling in order to prevent assemblage of pathogenic bacteria in super shops as well as local fish markets of Bangladesh.</p> Shilpi Sarkar Shuvra Kanty Dey Md. Ashraful Islam Nipu Parsha Shanjana Brishti Md. Baki Billah Copyright (c) 2020 Journal of Fisheries 2020-06-27 2020-06-27 Population dynamics of bearded croaker Johnius dussumieri (Cuvier, 1830) from Pakistani waters <p>In this study the length frequency data of 2510 bearded croaker <em>Johnius dussumieri</em> (Cuvier, 1830), collected from the coast of Pakistan during 2015, were analysed. Total length of the specimens (male and female combined) varied from 4 to 25 cm with dominant individuals ranged between 12 and 15 cm whereas the body weight varied between 3 and 155 g. The length frequency data were analysed for the estimation of population dynamics and the power coefficient <em>b</em> of length weight relationship was estimated as 2.83. Other measurements were as follows: asymptotic length, <em>L<sub>∞ </sub></em>= 26.25 cm; growth coefficient, <em>K</em> = 1.00 year<sup>–1</sup>; total mortality, <em>Z</em> = 2.43 year<sup>–1</sup>; and natural mortality, <em>M</em> = 1.82 year<sup>–1</sup>. The fishing mortality (<em>F</em>) and exploitation ratio (<em>E</em>) were 0.61 year<sup>–1</sup> and 0.251 respectively. The Biological Reference Points (BRPs) with Gulland method for this fishery (<em>F</em><sub>opt</sub>) was estimated 1.82 year<sup>–1</sup> which is higher than current fish mortality. Therefore the present study shows that the <em>J. dussumieri</em> fishery is safe in Pakistan.</p> Abdul Baset Qun Liu Baochao Liao Abdul Waris Han Yanan Zhang Qingqing Imtiaz Ahmad Copyright (c) 2020 Journal of Fisheries 2020-06-07 2020-06-07 Seasonal variation of cladocera in a perennial pond, Ambajogai (Maharashtra), India <p>A systematic investigation on seasonal variations of cladocera in Udayan Sarovar, a perennial pond&nbsp; near Swami Ramanand Teerth Mahavidyalaya at Ambajogai (Maharashtra, India) was carried out for a period of one year from June 2018 to May 2019. A total of 9 species of cladocera were identified. The cladoceran diversity fluctuated seasonally and the maximum number of 240 organisms L<sup>–1</sup> was recorded during month of April and minimum number of 22 organisms L<sup>–1</sup> during the month of September.</p> Vishwas Balasaheb Sakhare Ashwini Dnyandeo Chalak Copyright (c) 2020 Journal of Fisheries 2020-05-28 2020-05-28 Age, length-weight relationships and condition factors of endemic Antalya barb Capoeta antalyensis (Battalgil, 1943) <p>The aim of this study was to determine the length-weight, length-length relationships (LWR and LLR) and condition factors of Antalya barb <em>Capoeta antalyensis</em>, an endemic species to Turkey. The specimens (<em>N</em> = 125) were caught using the gill nets in the Sorgun Dam (Aksu, Isparta). The age of the study specimens varied between one and six years. The total length and body weight of the specimens varied from 17.7 – 36.7 cm and 57.03 – 526.91 g respectively. A negative allometric growth (<em>b</em> = 2.7743) was recorded for the species whereas the LWR and total length (TL) – fork length (FL) equations were <em>W</em> = 0.0203 × TL<sup>2.7743</sup> (<em>R<sup>2</sup></em> = 0.95) and <em>TL</em> = 0.402 + <em>FL</em> × 1.061 (<em>R<sup>2</sup></em> = 0.99) respectively. The condition factor was determined for every specimen. In light of the results obtained in the study this species may be considered for aquaculture ensuring sustainable population in the wild. This study provides new information that can play an important role in the sustainable management this species.</p> Soner Çetinkaya Rahmi Uysal Vedat Yegen Mustafa Ceylan Ufuk Akçimen Fuat Bilgin Copyright (c) 2020 Journal of Fisheries 2020-05-26 2020-05-26 Behavioural differences between breeding and nonbreeding pairs of protandry monogamous false clown anemonefish Amphiprion ocellaris <p>Anemonefishes are some of the most popular marine ornamental fishes. Due to the adverse impacts of commercial fishing on the wild populations of anemonefishes, a more suitable and efficient captive breeding programme must be promoted. In the wild, anemonefishes are protandrous sex-changing fish, but when two immature individuals with ambisexual gonads are raised together in captivity, the two differentiate directly into a male and a female, to form a breeding pair. However, not all the formed pairs spawn, explaining the great care required in captive breeding. This behaviour appears to be counter-adaptative, as anemonefish social groups form randomly in the wild, and such phenomenon would disturb their breeding success. This study evaluated the behavioural and physiological differences between breeding and nonbreeding pairs of false clown anemonefish <em>Amphiprion ocellaris</em> under captive conditions. Behavioural observations revealed that nonbreeding females monopolized the shelter provided, whereas breeding females allowed breeding males to use the shelter and the pair frequently stayed together in the shelter. Both nonbreeding and breeding females possessed mature ovarian tissue and similar level of plasma estradiol concentrations, but nonbreeding males had a smaller amount of testicular tissue and lower plasma 11-ketotestosterone levels compared to breeding males.</p> Eri Iwata Tasuku Yoshida Tetsuya Abe Kou Takahara Koji Masuda Copyright (c) 2020 Journal of Fisheries 2020-05-25 2020-05-25