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) Sun, 31 Dec 2023 00:00:00 +0000 OJS 60 BIOMETRIC INDICES OF PSEUDOTOLITHUS ELONGATUS (BOWDICH, 1825) FROM THE COASTAL WATERS OF RIVERS STATE, NIGERIA <p>Length-weight relationships (LWRs), length-length relationships (LLRs), and condition factor of <em>Pseudotolithus elongatus</em> from the coastal waters of Rivers State, Nigeria, were studied. Specimens were collected from the catches of fishermen using various fishing gear. The dominant length ranged from 20 to 26 cm, with a mean length of 22.65±3.06cm. The monthly length-weight relationship was estimated separately for male and female, with the b values indicating positive allometric growth (b &gt; 3.00) in November, January, and February for both male and female. The females experienced negative allometric growth (b &lt; 3.00) in December, March, and April, while the males exhibited a negative allometric growth pattern in April. The combined b value of LWRs (TL vs. BW) indicates positive allometric growth, and SL vs. BW indicates negative allometric growth. Also, the b value of LLR (TL vs. SL) indicates negative allometric growth. The condition factors varied for both sexes, ranging from 0.35 to 1.2 in males and 0.57 to 1.14 in females, while the combined condition factor ranged from 0.35 to 1.2. The present findings will provide useful information for a well-organized and significant exploitation and regulation of Sciaenid species following the aftermath of massive fish kills and continuous exploitation of fish species in the study area.</p> Henry Eyina Dienye, Olaniyi Alaba Olopade, Rejoice Upadi Philip, Joy Osaretimi Aiyeloja Copyright (c) 2023 Henry Eyina Dienye, Olaniyi Alaba Olopade, Rejoice Upadi Philip, Joy Osaretimi Aiyeloja Tue, 26 Dec 2023 00:00:00 +0000 SEXUAL SEASONAL GROWTH AND MORTALITY OF SCALDBACK, ARNOGLOSSUS KESSLERI SCHMIDT, 1915 (PLEURONECTIFORMES: BOTHIDAE), CAUGHT BY EXPERIMENTAL BEAM TRAWL IN THE BLACK SEA, TURKIYE <p>The scaldback, <em>Arnoglossus kessleri</em>, is a small fish that belongs to the Bothidae family and its biology is unknown in the Mediterranean Sea including Aegean Sea, Black Sea and Sea of Marmara. To describe first information on the seasonal von Bertalanffy growth function parameters (SVBGF) using length frequency data for <em>A. kessleri</em>, and also to present first information on indirect methods to estimate natural (<em>M</em>) and total mortality rates (<em>Z</em>), a total of 12 months samplings were conducted between December 2012 and November 2013 in the south-east Black Sea. The overall sex ratio of females: males skewed towards males (<em>χ<sup>2</sup></em>, <em>P</em> &lt; 0.01). The SVBGF parameters, computed from monthly length frequency distribution analysis (LFDA), were estimated as <em>L<sub>∞</sub></em> = 8.25 cm total length (<em>TL</em>), <em>K</em> = 0. 549 year<sup>-1</sup> for females and as <em>L<sub>∞</sub></em> = 8.44 cm TL, <em>K</em> = 0.490 year<sup>-1</sup> for males. The seasonal oscillation in growth rate for females (<em>C</em> = 0.340) was larger than it was for males (<em>C</em> = 0.260). The slowest period of growth corresponded to December both females and males. The seasonal growth of the scaldback was most probably initiated by photoperiod and accelerated with decreasing water temperatures. Total instantaneous mortality rate, <em>Z</em>, was estimated as 0.853 yr<sup>-1</sup> for females and 0.774 yr<sup>-1</sup> for males. Instantaneous natural mortality ratio, <em>M</em>, was estimated a bit higher for females (<em>M</em> = 0.714±0.129) than for males (<em>M</em> = 0.655±0.098). The exploitation rate, <em>E</em>, of both sexes was also lower than the optimum exploitation (<em>E</em> = 0.5) criterion, which is indicative of non-exploited and/or lightly exploited of <em>A. kessleri</em> population. The results of this study were offered as biological input parameters for management of Black Sea stocks of the scaldback species.</p> Sabri Bilgin, Hatice Onay Copyright (c) 2023 Sabri Bilgin, Hatice Onay Tue, 26 Dec 2023 00:00:00 +0000 HEAVY METALS RISK ASSESSMENT FOR CONSUMPTION OF WILD MEDITERRANEAN MUSSELS MYTILUS GALLOPROVINCIALIS LAMARCK, 1819 ALONG SAMSUN COASTS OF THE BLACK SEA <p>The present study aimed to determine the concentration of metals in the soft tissue of wild mussels in coastal of Samsun and to assess human consumption. Using inductively coupled plasma mass spectrometry, the quantities of cadmium, mercury, lead, copper, iron, and zinc in <em>Mytilus galloprovincialis </em>were measured. The heavy metals found in Mediterranean mussels are arranged in the following ascending order: Cd &lt; Hg &lt; Pb &lt; Cu &lt; Fe &lt; Zn. Concentrations of toxic metals were safe according to European Commission guidelines and the Ministry of Agriculture, Forestry and Fisheries. According to the estimated daily intake (EDI), eating Mediterranean mussels poses no risks. The target hazard quotients (THQs) in metals are also found &lt;1, which implies no threat to consumers. In conclusion, the current study confirmed that the concentration of heavy metals in the Mediterranean mussels is safe for people intake in terms of their toxicity.</p> Levent Bat, Öztekin Yardım, Elif Arıcı, Zeynep Hasançavuşoğlu, Ayşah Öztekin Copyright (c) 2023 Levent Bat, Öztekin Yardım, Elif Arıcı, Zeynep Hasançavuşoğlu, Ayşah Öztekin Tue, 26 Dec 2023 00:00:00 +0000 TRACE METAL CONTAMINATION OF DISCHARGE WATER IN THE NORTHEAST MEDITERRANEAN SEA <p>The contamination with trace metals brought on by anthropogenic activity is one of the main issues impacting the health of the environment. The inherent pressures on marine ecosystems and the individuals who depend on marine ecosystems for nourishment, industry, and advantage are both being seriously threatened by trace metal pollution in coastal and marine habitats. This study aimed to find out the accumulation of metals (Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb and Zn) in seasonal water samples taken for a year from the Ceyhan River's discharge point into the Northeast Mediterranean. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) measurements of water were performed using an appropriate trace metal-based approach. The relative mean metal concentrations in the water column were in the following order at the sample site: Zn &gt; Fe &gt; Ni &gt; Cr &gt; Cu &gt; Pb&gt; Mn &gt; Cd &gt; Co &gt; Hg. The highest value of Zn in the water column was observed at 90.05810.605 g L<sup>-1</sup>. The levels of contaminants in the water when compared to international and national water quality standards have been judged to be within the safe drinking range.</p> Ozlem Guner Gurlek, Ayşegul Ergenler; Funda Turan Copyright (c) 2023 Ozlem Guner Gurlek, Ayşegul Ergenler; Funda Turan Tue, 26 Dec 2023 00:00:00 +0000 FIRST RECORD OF ALIVE ASTERIGERINA (FORAMINIFERA: ROTALIIDA) WITH NOTE ON ITS DISTRIBUTION AND ABUNDANCE FROM THE COASTAL AREA OF PAKISTAN, NORTHERN ARABIAN SEA <p>Foraminifera is an important group of organisms which is widely used as indicators of environmental change.&nbsp; Not much work on foraminifera has been done on the Arabian margin running along the Pakistan coast. Information on the diversity and distribution of foraminifera is very limited and no information is available from the Balochistan coast. This study is an attempt to explore the diversity and dynamics related to foraminifera at the coast of Baluchistan. This very part of the study is designed to collect information about the zonation, vertical distribution and&nbsp; abundance of&nbsp; the genus <em>Asterigerina</em>&nbsp; at the beach of Ormara, Balochistan. The fossilized form of <em>Asterigerina</em> was previously reported from the sediments of upper Quetta region.&nbsp; This is the first report on the occurrence of alive <em>Asterigerina </em>in the coastal areas of Pakistan.</p> Anila Gopang, Sumera Farooq, Qadeer Mohammad Ali Copyright (c) 2024 Anila Gopang, Sumera Farooq, Qadeer Mohammad Ali Sun, 31 Dec 2023 00:00:00 +0000