Pakistan Journal of Marine Sciences 2022-01-12T20:02:56+00:00 Dr Qadeer Muhammad Ali Open Journal Systems <p><strong>Aim and Scope</strong></p> <p>The Pakistan Journal of Marine Sciences (Print ISSN 1019-8415, Online ISSN 2710-4583, CODEN PJMSE8) a bi-annual journal is an official publication of The Marine Reference Collection and Resource Centre, University of Karachi.</p> <p>PJMS is dedicated to publish original research papers in the broad field of Ocean Sciences. All the major aspects of marine science are covered in PJMS including zoology, botany, geology, chemistry, physiology, systematic, ecology, physical oceanography and fisheries. The journal is abstracted and indexed by ASFA, BIOSIS, PASTIC, Chemical Abstracts, Current Contents, Oceanic Abstracts and Zoological Records.</p> WINNERS AND LOSERS: POST CONFLICT BIODIVERSITY IN ‎THE STRESSED ECOSYSTEM OF KHOR AL-ZUBAIR, IRAQ 2022-01-03T10:58:12+00:00 Malik Hassan Ali‎ Nadia Al-Mudaffar‎ Hanaa Hussein Mohammed‎ Brian Helmuth Amanda Dwyer <p>A rapid assessment of biodiversity in the immediate wake of civil conflict and other disasters is critical to inform recovery efforts. We report on the first surveys of aquatic biodiversity in Khor Al-Zubair (KAZ) in southern Iraq, following the cessation of recent violence in the region. This site is in the midst of ongoing environmental changes due to climate change and reductions in water flow from the Tigris and Euphrates rivers, which have led to increases in salinity in the KAZ. Monthly surveys of biodiversity were conducted in 2017-2018 and compared to historical data from the site obtained from a literature survey. Results indicate a loss of 80% of species richness, suggesting a fundamental and potential catastrophic decline in species diversity resulting from largely anthropogenic drivers.</p> 2021-12-31T00:00:00+00:00 Copyright (c) 2021 Malik Hassan Ali‎, Nadia Al-Mudaffar‎, Hanaa Hussein Mohammed‎, Brian Helmuth, Amanda M. Dwyer THE FIRST ASSESSMENT ON METAL CONTAMINATION IN ‎THE CRITICALLY ENDANGERED SAWBACK ANGEL SHARK ‎‎(SQUATINA ACULEATA) FROM NORTH-EASTERN ‎MEDITERRANEAN 2022-01-03T11:42:23+00:00 Funda Turan‎ Mehmet Lütfi Yola‎ Aysegul Ergenler Cemal Turan <p>A Sawback angel shark (<em>Squatina aculeata</em>) classified as “Critically Endangered” Global Red List by the IUCN (2017) and CITES (2017) is one of the threated elasmobranch groups and the increased pollution in the marine environment negatively impact angel shark species. Despite this, limited information exists about the effects of toxic chemical contamination in angel sharks. Therefore, present study was conducted to elucidate heavy metal accumulation in <em>Squatina aculeata</em> captured from the Iskenderun Bay, North-Eastern Mediterranean by electrochemical technique. Arsenic (As), Mercury (Hg), Copper (Cu), Iron (Fe), Zinc (Zn) and Mangan (Mn) were found by electrochemical analyzer. Among the gill and liver tissue samples of <em>S. aculeata</em>, Fe and Zn were detected as highest concentrations followed by As, Hg, Mn and Cu; Among the muscle tissue of <em>S. aculeata,</em> Fe and Zn were detected as highest followed by Hg, As, Mn and Cu. Average total arsenic contents in <em>S. aculeata</em> was 7.5416±0.6548 μg g<sup>-1</sup>, which exceeded maximum limit legalized for any kind of food. Similarly, Total mercury average content in <em>S. aculeata</em> was 19.9942±1.6116 μg g <sup>-1</sup>, which exceeded the proposed limit value which is 0.2-2 μg g<sup>-1</sup>, confirming that the consumption of <em>S. aculeata</em> is a high risk threating the health of consumer. These results confirmed that the metal contamination in North-Eastern Mediterranean area may pose a potential threat to the sustainability of <em>S. aculeata</em> in marine ecosystem and the concentrations detected is the above the safety limits for angel shark that should be taken into consideration regarding human consumption.</p> 2021-12-31T00:00:00+00:00 Copyright (c) 2021 Funda Turan, Mehmet Lütfi Yola‎, Aysegul Ergenler, Cemal Turan ESTIMATION OF GROWTH PATTERN AND FORM FACTOR OF TORPEDO SCAD MEGALASPIS CORDYLA (LINNAEUS, 1758) IN THE BAY OF BENGAL, BANGLADESH 2022-01-12T20:02:56+00:00 Most. Shakila Sarmin Tanjin Tanjin Md. Ashekur Rahman Md. Rabiul Hasan Wasim Sabbir Md. Asadujjaman Md. Rashedul Kabir Mondol Kazi Ahsan Habib Md. Yeamin Hossain <div class="t pg-2m0 pg-2x0 pg-2h3 pg-2y3 pg-2ff2 pg-2fs0 pg-2fc0 pg-2sc0 pg-2ls0 pg-2ws0">The horse mackerel, Megalaspis cordyla is one of the commercially valuable fish species in the Bay of Bengal. This study was defined the growth pattern and form factor (a3.0) of M. cordyla in the Bay of Bengal. Total of 105 specimens were analyzed, caught from the Bay of Bengal during January to December 2020. Total length (TL) was measured by measuring board with 0.01 cm and body weight (BW) was taken by digital balance with 0.01 g accuracy. The TL and BW varied between 16.8 to 41.0 cm<br>and 67.15 to 544.0 g, respectively. The length-weight relationship (LWR) was significantly related (p &lt; 0.0001), with r2 value 0.984. The evaluated allometric coefficient (b) was 2.50 that indicated negative allometric growth (&lt; 3.0) in the Bay of Bengal. The estimated a3.0 was 0.0102 for M. cordyla in the Bay of Bengal. The assessed a3.0 was varied from 0.0069 to 0.0182 in worldwide waterbodies. The computed median (0.0102) and 95% confidence limit (0.0099-0.0132) specified that M. cordyla poses the<br>typical torpedo body shape ‘fusiform’. This study will provide information on growth pattern and form factor as well as body shape alternation between geographic distributions which would be effective for its stock assessment and management in the<br>Bay of Bengal and else-where.</div> 2021-12-31T00:00:00+00:00 Copyright (c) 2021 Most. Shakila Sarmin, Sumaya Tanjin, Md. Ashekur Rahman, Md. Rabiul Hasan, Wasim Sabbir, Md. Asadujjaman, Md. Rashedul Kabir Mondol, Kazi Ahsan Habib, Md. Yeamin Hossain RE-DISCRIPTION OF CALAPPA EXANTHEMATOSA ALCOCK ‎AND ANDERSON, 1894 (CRUSTACEA: DECAPODA: ‎CALAPPIDAE) FROM THE COASTAL WATERS OF PAKISTAN 2022-01-10T06:30:51+00:00 Hamid Badar Osmani Farah Naz Noor Us Saher <p>The box crab <em>Calappa exanthematosa </em>Alcock and Anderson, (1894) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;re-described from the coastal waters of Pakistan. <em>C. exanthematosa</em> was collected as a bycatch during the shrimp trawling. This species previously synonymised under &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>C. japonica </em>Ortmann, (1892) from the Bay of Bengal, (type locality Japan), since 1937 to till date (Galil, 1997; Spiridinov and Apel, 2007). Ng <em>et al</em>., (2011) re-described and illustrated the<em> C exanthematosa </em>after comparison of freshly collected specimen of <em>Calappa japonica</em> from the Gulf of Oman and India and revealed that the both species have resemblance to each other, but few marked differences exist between both species. Current study re-described the morphological characteristic of <em>C. exanthematosa </em>from the coastal waters of Pakistan.</p> 2021-12-31T00:00:00+00:00 Copyright (c) 2021 Hamid Badar Osmani, Farah Naz, Noor Us Saher ESTIMATION OF CONDITION FACTOR OF BENGAL TONGUE ‎SOLE (CYNOGLOSSUS CYNOGLOSSUS) IN THE BAY OF ‎BENGAL, BANGLADESH 2022-01-10T06:46:38+00:00 Sumaya Tanjin Md. Ashekur Rahman Minhaz Uddin Biplob Kumer Sarker Most. Shakila Sarmin‎ Zannatul Mawa‎ Md. Ataur Rahman‎ Obaidur Rahman Md. Abdus Samad Kazi Ahsan Habib Md. Yeamin Hossain <p>The Bay of Bengal is rich with its biological diversity, which plays an important role in the country's economic and social development. This study describes the condition factor of <em>Cynoglossus cynoglossus</em> in the Bay of Bengal, Bangladesh. Samples were collected from the Bay of Bengal during January to December 2020. Body weight (BW) of fishes were taken by an electric balance with 0.01 g precision, and total length (TL) was measured using a measuring board to the nearest 0.1 cm accuracy. The Fulton’s condition factor was estimated by the equation: <em>K<sub>F</sub></em> =100 <em>× (BW/TL<sup>3</sup>)</em>. Total length and body weight ranged from 10.0-38.7 cm (mean ± SD = 24.24 ± 6.30) and 9.1-280.6 g (98.44 ± 57.79), respectively. The value of Fulton’s condition factor was observed as 0.6469 (SD = 0.1148), indicating unstable physiological condition of fish in Bay of Bengal. The outcomes of this study will be helpful for sustainable management of <em>C. cynoglossus</em> in the Bay of Bengal and use as baseline information for further studies.</p> 2021-12-31T00:00:00+00:00 Copyright (c) 2021 Sumaya Tanjin, Md. Ashekur Rahman, Minhaz Uddin, Biplob Kumer Sarker, Most. Shakila Sarmin‎, Zannatul Mawa‎, Md. Ataur Rahman‎, Obaidur Rahman, Md. Abdus Samad, Kazi Ahsan Habib, Md. Yeamin Hossain