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) Thu, 30 Jun 2022 00:00:00 +0000 OJS 60 MORPHOMETRIC RELATIONSHIPS AND MERISTIC ‎CHARACTERISTICS OF MEGALASPIS CORDYLA ‎(LINNAEUS, 1758) FROM THE BAY OF BENGAL‎ <p><em>Megalaspis cordyla</em> is one of the Carangid fish species commonly found in marine areas of the Sundarbans and the Bay of Bengal in Bangladesh. This study described the morphometric relationships including length-weight and length-length relations (LWRs and LLRs) and meristic characteristics of <em>M. cordyla</em>. A total of 100 individuals were collected from commercial fishers’ catch in the Bay of Bengal, Bangladesh during January-December 2021. For each individual, a total of fourteen various lengths were measured by measuring board with 0.01 cm and body weight (BW) was taken by digital balance with 0.01 g accuracy. Fin-ray numbers from all fins as well as scutes were counted by a magnifying glass. Total length (TL) varied from 17.0-36.5 cm and the total body weight (BW) ranged from 75.0-416.6 g. All LWRs were significantly related (<em>p </em>&lt; 0.001), with <em>r<sup>2</sup></em> values ≥ 0.910. Based on <em>r<sup>2</sup></em> value (0.979), LWR by BW <em>vs</em>. TL (W= <em>a</em> × L<em><sup>b</sup></em>) was the best fitted model among 14 equations. Besides, the LLRs were also significant with <em>r<sup>2 </sup></em>values ≥ 0.908. According to <em>r<sup>2</sup></em> value (0.995), LLR by TL <em>vs</em>. FL (TL = <em>a</em> + <em>b</em>× FL) was the best fitted model among 14 equations. The fin formula of <em>M. cordyla</em> is: first dorsal, D<sub>1</sub> I+VII; second dorsal, D<sub>2</sub> I/14-18+6-8 finlets; pectoral, P<sub>1</sub> 20-26; pelvic, P<sub>2</sub> I/5; anal, A II+I/12-16 +5-7 finlets. This study provided knowledge on morphometric and meristic features that would be very useful for species identification and stock assessment of <em>M. cordyla</em> in the Bay of Bengal and other marine ecosystems.</p> Most. Shakila Sarmin‎, Md. Ashekur Rahman‎, Mst. Shefaly Khatun‎, Biplob Kumer Sarker‎, Md. Ataur Rahman, Wasim Sabbir, Md. Asadujjaman, Md. Abdus Samad, Kazi Ahsan Habib Copyright (c) 2022 Most. Shakila Sarmin‎, Md. Ashekur Rahman‎, Mst. Shefaly Khatun‎, Biplob Kumer Sarker‎, Md. Ataur Rahman, Wasim Sabbir, Md. Asadujjaman, Md. Abdus Samad, Kazi Ahsan Habib Thu, 30 Jun 2022 00:00:00 +0000 DESCRIPTION OF THE FIRST TO FOURTH ZOEAL STAGES ‎OF MACROBRACHIUM EQUIDENS (DANA, ‎‎1852) (CRUSTACEA: DECAPODA: PALAEMONIDAE)‎ <p>An ovigerous female of&nbsp;<em>Macrobrachium equidens </em>(Dana, 1852) collected from near shore of Sandspit back waters (Karachi, Pakistan) (Long. 66<sup>o</sup> 54’ 24”E Lat. 24<sup>o </sup>50’ 24”N) on 19, October, 2009, and kept under the laboratory conditions. Larvae were hatched out after 13 days. Zoea I to zoea III stages passed within 6 days at room temperature 31<sup>o</sup>C, water temperature 29<sup>o</sup>C, in filtered seawater of a salinity of 37 ‰ and pH 7.9.The Zoea IV of the same species was collected from planktonic sample of Manora Channel, Karachi (Long. 66<sup>o</sup> 59’ E Lat. 24<sup>o </sup>48’ N) on 1995.</p> <p>The larvae of this species are described and illustrated along with comparisons to those described previously.</p> <p>&nbsp;</p> Farhana S. Ghory, Quddusi B. Kazmi, M. Afzal Kazmi Copyright (c) 2022 Farhana S. Ghory, Quddusi B. Kazmi, M. Afzal Kazmi Thu, 30 Jun 2022 00:00:00 +0000 BENTHIC ASSEMBLAGES FOR ECOLOGICAL EVALUATION ‎OF LAKE BOROLLUS, MEDITERRANEAN SEA, EGYPT <p>Lake Borollus is one of the largest and oldest Egyptian lakes, whereas it is located in the far north of the Delta and mediates between the two branches of Rosetta and Damietta. It is connected to the Mediterranean Sea through Boghaz El Borollus and to the Nile through the Bermbal Canal, which was established in 1926 to feed the lake with abundant quantities of Nile water and Nile fish. Central coordinates: latitude 31°30' N and longitude 30°49' E with an area has decreased from 160,000 acres to 108,000 acres. The present work provides an ecological study on the regional and temporal distribution of benthic communities in particular along the wetlands lakes waters. Indicated that, the effective sediment and water variables which significantly correlated with the distribution and abundance of the identified benthos assemblages of vegetation and animal’s groups include sediments structure, water quality (pH, S%, DO, BOD, temperature. Overall, 10 taxa and 27 species of macroinvertebrates were identified. They were exclusively associated with submerged vascular plants <em>Potamogeton pectinatus</em> while only 10 were alive forms and the rest were represented by calcareous shells of molluscs. The benthic flora and fauna were estimated in the Lake Botollus, Egypt is subjected to the influx of sewage effluents, agriculture drainages and industrial wastes. Also considerable amounts of drain water are constantly discharged along the southern drains. Quantitative hauls were performed at the different habitats during winter and summer, 2017 covering 12 sampling sites and 9 drains discharged directly to the lake which bottom sampling was collected by grab sampler were selected to represent the covering the different environments. The dredged area per each station was 225 cm<sup>2</sup> per haul. Results illustrated that the distribution of benthos in the estimated area is greatly affected by the degree of pollution as well as the prevailing hydrological conditions. The aquatic submerged vascular plants <em>Potamogeton pectinatus</em> appeared as the most common species in the lake in addition the bottom animals appeared more- sensitive to pollution than submerged vascular; thus, their lowest counts were recorded at the most sites and the fauna was mainly represented by the Nematoda, Oligochaeta, Polychaeta, Insects larvae, Ostracoda, Amphipoda, Barnacles, and juvenile larvae of Mollusca. Sediments in some areas consist of organic materials (sludge) is composed of waste sewage and agricultural and industrial and others of sandy silt (silt), calcareous shells are mainly of molluscs’ and therefore it can determine some environments prevailing in the lake. Results indicated for examining configuration qualitative benthic macro during the study period were recorded 27 species, including 9 species of living benthic macro organisms include one type of aquatic submerged vascular plants of species <em>Potamogeton pectinatus</em>. Although higher values of taxonomic richness, the Shannon and index (H`) and evenness (J`) were obtained with the water <em>Potamogeton pectinatus</em> habitat as well as Ostracoda <em>Sclerochilus contortus</em> were most abundant.</p> Mohamed Mohamed El Komi Copyright (c) 2022 Mohamed Mohamed El Komi Thu, 30 Jun 2022 00:00:00 +0000 MOLLUSCANS SPECIES DIVERSITY AND PROTEIN ‎EXPRESSION ANALYSIS IN LUNELLA CORONATA SPP OF ‎FAMILY TURBINIDAE FROM THE MANORA CHANNEL ‎KARACHI, PAKISTAN <p>Manora rocky shore characterize as a shore having moderate to strong wave exposure, zonation pattern characterize by intertidal habit, different communities of invertebrates and algae bands dominated by molluscan diversity and associated fauna. The current study contribute the species diversity of molluscs from the Manora rocky ledge, coast of Pakistan. A total of 11 species were recorded pertaining to 9 families and 11 genera including family Turbinidae: <em>Turbo bruneus, Lunella coronata, </em>family Cerithiidae: <em>Cerithium caeruleum</em><em>,</em> family Babyloniidae: <em>Babylonia spirata</em>, <em>family Neritidae</em>: <a href=";id=216254"><em>Nerita albicilla</em></a><em>, </em>family: <em>Chilodontaidae Euchelus asper</em>, <em>family Veneridae</em>: <em>Circenita callipyga</em>, <em>family Arcidae</em>: <em>Barbatia obliquata</em>. <em>Family</em> <em>Pectinidae</em>, <em>Mimachlamys townsendi, family </em><a href=";id=23001">Chamidae</a>: <em>Chama </em>sp, family <a href="">Littorinidae</a> and Sub family Trachycardiinae <em>V. assimile</em>. In addition, Protein expression analysis of <em>L. cornata</em> was also observed through Polyacrylamide gel electrophoretic. <em>L. coronata</em> was previously reported from the coastal water of Pakistan with some morphological variation in the shell shape and the results reveled that electrophoretic patterns of proteins in <em>L. cornata</em> spp 1 and <em>L. cornata</em> spp2 differentiate from each as seen in morphological characters.</p> Nuzhat Afsar‎, Farah Naz‎, Noor Us Saher, Shafaq Ibrahim‎, Hafiza Mahzaib Sadiq‎, Urooba Ahmed‎, Ramsha Mughal‎, Syeda Zainab Bint e Ahmed‎, Sonia Abdul Jabbar Copyright (c) 2022 Nuzhat Afsar‎, Farah Naz‎, Noor Us Saher, Shafaq Ibrahim‎, Hafiza Mahzaib Sadiq‎, Urooba Ahmed‎, Ramsha Mughal‎, Syeda Zainab Bint e Ahmed‎, Sonia Abdul Jabbar Thu, 30 Jun 2022 00:00:00 +0000 LENGTH-WEIGHT RELATIONSHIP AND CONDITION FACTOR IN SARDA ORIENTALIS (TEMMINCK & SCHLEGEL, 1844) (FAMILY-SCOMBRIDAE) FISH FROM KARACHI FISH HARBOUR <p>Sarda orientalis (Family-Scombridae) of assorted length (cm) and weight (gm) were obtained from Karachi fish harbor during January to December (2019) for measurement of length-weight relationship (LWR’s) and Fulton‘s condition factor (K). The range of length (57-60.8) and weight (2123-2641) were estimated. Total mean length (cm) (gm) (59.14±0.94) and weight (gm) (2336.32±114.21) were measured. LWR was estimated as W = 0.08166134 × L 2.5149 (log W = -1.088 + 2.5149log L). The highest mean of condition factor (K) (1.15±0.02) were measured in post-monsoon season. Assorted (ANOVA) analysis indicates that there is a significant correlation between weight, length, and season (p0.05).</p> Kanwal Muzaffar, Farzana Yousuf, Iqra Shaikh Copyright (c) 2022 Kanwal Muzaffar, Farzana Yousuf, Iqra Shaikh Thu, 30 Jun 2022 00:00:00 +0000