Pakistan Journal of Marine Sciences <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> en-US (Dr Qadeer Muhammad Ali) (Dr Farhana S. Ghory & Dr. Sumera Farooq) Sat, 31 Dec 2022 00:00:00 +0000 OJS 60 MODELLING CURRENT AND FUTURE DISTRIBUTION OF THE INVASIVE SILVER-CHEEKED TOADFISH LAGOCEPHALUS SCELERATUS IN THE MEDITERRANEAN SEA <p>The progress in species distribution modeling has brought new insights<br>into biological invasion management. The present study aims to model the potential<br>current geographic distribution and future expansion of silver-cheeked toadfish<br>Lagocephalus sceleratus in the Mediterranean Sea. Coordinates of 98 occurrence records<br>of L. sceleratus in the Mediterranean were used, and marine climatic variables were<br>collected from the global databases. Fifteen modeling techniques were tested, and<br>weighted ensemble averaging of the model replicates was built. AUC values for each<br>model ranged from 0.61 for rpart to 0.99 for rf, and TSS values varied from 0.41 for mlp<br>to 0.95 for rf. Based on the cutoff values of TSS and AUC, the seven modelling<br>algorithms were used for ensemble modeling. The maximum seawater temperature at<br>minimum depth explained strong biological importance to the current adaptation, and the<br>salinity contributed the most to the future adaptation. The ensemble forecasting of<br>suitable habitats of L. sceleratus for current distribution modeling revealed that<br>L. sceleratus dominantly occurred in the middle and eastern parts of coastal areas of the<br>Mediterranean. The future distribution was extended to the western part of coastal areas<br>of the Mediterranean, classifying the high suitability of these areas for its future<br>distribution. The suitable bioclimatic envelope of L. sceleratus under the present study is<br>predicted to widen because of climate change. The likely regions of invasion and the<br>areas at risk for a potential future invasion of L. sceleratus indicate that prompt, effective<br>practical actions by resource managers should be undertaken to mitigate its impacts and<br>spread.</p> Cemal Turan, Servet Ahmet Doğdu Copyright (c) 2023 Cemal Turan, Servet Ahmet Doğdu Sat, 31 Dec 2022 00:00:00 +0000 EFFECT OF FREEZING PERIOD ON CHEMICALCOMPOSITION, MICROBIAL LOAD AND SOME PATHOGENICBACTERIA OF NILE TILAPIA (OREOCHROMIS NILOTICUS) <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1ya pg-1ff2 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0"><span class="pg-1ff1">This study evaluated the effects of freezing periods on nutritional values,</span></div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1yb pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">microbial loads, and some pathogenic bacteria in Nile Tilapia (<span class="pg-1ff4">Oreochromis niloticus</span>). 8</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1yc pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">kg. Samples were collected from El-mawourda Fish Market in Khartoum State, for four</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1yd pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">experimental treatments. The treatments were conducted on the period 0 day, 7 days, 15</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1ye pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">days and 21 days. It is noticed that the freezing period effect on the nutritional value,</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1yf pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">microbial load and some pathogenic bacteria of Nile tilapia (<span class="pg-1ff4">Oreochromis niloticus</span>)</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y10 pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">revealed that the lowest average nutritional assessment of Nile tilapia (<span class="pg-1ff4">Oreochromis</span></div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y11 pg-1ff4 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">niloticus<span class="pg-1ff1">) observed for protein 20% at the third period of freezing (21 days), and minerals</span></div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y12 pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">were calcium, phosphorus, magnesium, iron, sodium and potassium (5.6 – 2.7%, 4.8 –</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y13 pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">2.9%, 2.6 – 2.9%, 1.1 – 0.71%, 4.5 – 2.8%) respectively. The result of this study clarified</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y14 pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">that the freezing period has a considerable consequence (p ≤ 0.05) on the chemical</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y15 pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">composition, microbial load and same pathogenic bacteria (<span class="pg-1ff4">E. coli</span> and <span class="pg-1ff4">Salmonella</span>) of</div> <div class="t pg-1m0 pg-1x1 pg-1h2 pg-1y16 pg-1ff1 pg-1fs0 pg-1fc0 pg-1sc0 pg-1ls0 pg-1ws0">Nile tilapia (<span class="pg-1ff4">Oreochromis niloticus</span>).</div> Hassan M. Yagoub Copyright (c) 2023 Hassan M. Yagoub Sat, 31 Dec 2022 00:00:00 +0000 A NEW SPECIES OF PHILOMETRA REPORTED FROM THE OVARIES OF EDIBLE FISH EPINEPHELUS BLEEKERI (VAILLANT 1878) OF THE KARACHI COAST <p>Nutritionally, fish meat is identified as healthiest meat all over the world.<br>Nutriments that are essential for healthy diet can be easily drive from fishes. Beside fish<br>meat there are various type of derivatives that we can obtain from them. Economically<br>fish industry is considered as backbone for any country. Approximately, 45,000 species<br>of helminth parasites cause pathogenicity in vertebrate hosts that are known to man.<br>Parasite that belong to family Philometridae usually invade different body organs and<br>cavities of various fishes. Parasite that cause pathogenicity in reproductive organs of fish<br>ultimately cause disturbance in their release of reproductive hormones, mating behavior,<br>difficulty in spawning and ultimately number of fry production is declined.<br>This research was conducted on the nematode parasites of marine fish Epinephelus<br>bleekeri (Vaillant 1878) from Karachi coast during January,2021 to December,2021. In<br>this one year research, a new species of nematode Philometra bleekerii n.sp. was<br>recorded from the reproductive organs of marine fish Epinephelus bleekeri (Vaillant<br>1878).</p> A.G. Rizwana, Sumbul Zulfiqar Copyright (c) 2023 A.G. Rizwana, Sumbul Zulfiqar Sat, 31 Dec 2022 00:00:00 +0000 ESTIMATION OF POPULATION STRUCTURE, GROWTH AND CONDITION OF LATES CALCARIFER (BLOCH, 1790) IN THE BAY OF BENGAL <p>The current study illustrates the life-history traits; including length<br>frequency distribution (LFD), length-weight and length-length relationship (LWR and<br>LLR), condition factors (allometric, KA; Fulton’s, KF; relative condition, KR; relative<br>weight, WR), and natural mortality (Mw) of Lates calcarifer from the Bay of Bengal,<br>Bangladesh. A total of 103 individuals were randomly collected from January to<br>December 2021 using traditional fishing gear including Koral net and gill net. For each<br>individual, total length (TL), standard length (SL), and total body weight (BW) were<br>measured with measuring scale to 0.1 cm and digital balance to 0.1 g precision,<br>respectively. The TL size class 84.0 cm was a numerically dominant group in the<br>population. The b value of LWR (TL vs. BW) indicated positive allometric growth<br>(b=3.28) pattern in the Bay of Bengal. Likewise, the b value of LLR indicated also the<br>same growth pattern. Among the four types of condition factors, KF is the best-suited tool<br>for evaluating the well-being of L. calcarifer. Additionally, WR exhibited significant<br>divergence from 100 (P&lt; 0.0001), defining an imbalanced habitat. The calculated Mw was<br>0.23 year-1 for L. calcarifer. Therefore, these findings would be used in the future for the<br>improved management of this species in the Bay of Bengal as well as for connecting<br>ecosystems.</p> Nur-E-Farjana Ilah, Md. Joynal Abedin, Md. Ashekur Rahman, Md. Abul Kalam Azad, Most. Taslima Khatun, Md. Asadujjaman, Md. Abdus Samad, Kazi Ahsan Habib, Md. Nowsher Ali, Most. Shakila Sarmin Copyright (c) 2023 Nur-E-Farjana Ilah, Md. Joynal Abedin, Md. Ashekur Rahman, Md. Abul Kalam Azad, Most. Taslima Khatun, Md. Asadujjaman, Md. Abdus Samad, Kazi Ahsan Habib, Md. Nowsher Ali, Most. Shakila Sarmin Sat, 31 Dec 2022 00:00:00 +0000 MORPHOMETRIC RELATIONSHIP OF PERNA VIRIDIS LINNAEUS, (1758) FROM THE MANORA CHANNEL, COASTAL WATERS OF PAKISTAN <p>Perna viridis (Green Mussels) is characterized by fast-growing, found in<br>large clusters, one of the dominant bio-fouling organisms, native to West Indo Pacific<br>region and commonly distributed along the Southeast Indian and Asian coast. They are<br>found in the shallow sublittoral water up to a depth of 15 m and be able to tolerate an<br>extensive range of environmental situation i.e. tolerate temperatures range of 15-32.5C.<br>Green mussels were collected from the navigation buoy in Manora Channel and brought<br>to the research laboratory. Samples were washed to remove the sand, vegetation, and<br>other particles. Morphometric measurements were measured to the nearest gram. The<br>result revealed that the shell length ranged between 0.60-7.4 cm, the width range between<br>0.10-2.9 cm, and the weight range between 0.037-15.549 g. In all morphometric<br>relationships, the validation of the “b” values was significantly different from the<br>isometric value. Significant correlation variation was observed in all variables whereas<br>the highest correlation values were observed in the length-width (n-224, r2 = 0.966) and<br>the lowest was observed in width-total weight (n-224, r2 = 0.85). The analysis of variance<br>(ANOVA) revealed that all variables showed significantly different (DF=1, p&lt;0.000).</p> Farah Naz, Nuzhat Afsar, Ambareen Abbas, Hafsa Hoor Siddiqui, Salman Diljan, Syed Ibtehaj Sherazi Copyright (c) 2023 Farah Naz, Nuzhat Afsar, Ambareen Abbas, Syeda Hafsa Hoor, Salman Diljan, Syed Ibtehaj Sherazi Sat, 31 Dec 2022 00:00:00 +0000 STUDIES ON THE MORPHO TAXONOMIC VARIATIONS OF FOUR CENTROPAGIDAE SPECIES (CRUSTACEA: ‎CALANOIDA) WITH NOTE ON THEIR ABUNDANCE ‎COLLECTED FROM SONMIANI BAY, NORTHERN ARABIAN SEA <p>Centropagidae is comparatively a larger family to other families of order calanoida. The quantitative data revealed that the copepods of the genus&nbsp;<em>Centropages</em>&nbsp;are the dominant component in the zooplankton samples from the designated station in Sonmiani bay, a coastal lagoon at Balochistan coast, northern Arabian sea. Four epipelagic species of family Centropagidae,<em> Centropages </em>(<em>Centropages dorsispinatus</em> Thompson I.C. &amp; Scott A., 1903,<em> Centropages tenuiremis </em>Thompson I.C. &amp; Scott A., 1903,<em> Centropages furcatus </em>(Dana, 1849) and <em>Centropages orsinii</em> Giesbrecht, 1889 ) were identified. Male and female specimens were distinguished on their characteristic features of antennules, thoracic segments and fifth legs. Identified specimens were described briefly with their microscopic illustrations. <em>Centropages dorsispinatus </em>and<em> Centropages tenuiremis </em>were frequently found in zooplankton samples throughout the sampling season.</p> Shumaila Mubarak, Qadeer Mohammad Ali Copyright (c) 2023 Shumaila Mubarak, Qadeer Mohammad Ali Sat, 31 Dec 2022 00:00:00 +0000