Yazar "Ali, Qadeer Mohammad" seçeneğine göre listele

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    A Review on Studies of Heavy Metal Determination in Mackerel and Tuna (Family-Scombridae) Fishes
    (Bülent VEREP, 2018) Ahmed, Quratulan; Bat, Levent; Öztekin, Aysah; Ali, Qadeer Mohammad
    In this review, the chemicals, some of the mostimportant of which are heavy metals and their accumulation level in Mackerels,Tunas, and Bonitos in mainly the Arabian Sea and coastland in other seas werereviewed and compared.
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    A Review on Studies of Heavy Metal Determination in Mackerel and Tuna (FamilyScombridae) Fishes
    (2018) Ahmed, Quratulan; Bat, Levent; Öztekin, Aysah; Ali, Qadeer Mohammad
    Many chemicals especially heavy metals that are exist in fish are essential for human life at low amounts, but can be toxicat high amounts. Other chemicals such as Hg, As, Cd and Pb have not any essential function in biota and are toxic even at very low amountswhen ingested for a long period. The aim of this review is to compare and evaluate heavy metal levels in commercial fish species from theArabian Sea and coastline in other seas. In this review, Mackerels, Tunas and Bonitos species, the most commercial of Scombridae family, werechosen. The state of the metal pollution levels of these fishes is revealed under the light of the literature. The chemicals, some of which are themost important heavy metals such as Zn, Fe, Cu, Pb, Cd, Hg, As, Cr and Mn were chosen and their amounts in commercial fish were evaluated.Most of studies showed that essential metals in fish species are much high, but the quantities of non-essential metals in edible tissues offish are found to be less. This review has shown that fish are used as bio-monitoring in heavy metal pollution. It is suggested that suchinvestigations should be continuous in terms of both human health and determination of metal pollution of our coasts.
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    A Study on Diet Composition and Feeding Habits of Sphyraena putnamae Jordan & Seale, 1905 from the Northern Arabian Sea
    (Central Fisheries Research Inst, 2025) Zohra, Kashifa; Yousuf, Farzana; Ahmed, Quratulan; Ali, Qadeer Mohammad; Bilgin, Sabri; Bat, Levent
    The food and feeding habits of the Sphyraena putnamae (n=381) ranging from 16 to 99 cm were investigated the Karachi coast, the Northern Arabian Sea, Pakistan. S. putnamae consumed various prey items, which were divided into three categories: teleosts, molluscs, and crustaceans. Molluscs and crustaceans were the second preferred food component rather than teleost. The major constituents of the teleost group on basis of their ascendancy, were identified to be (dorosomatids; sciaenids; leiognathids; platycephalids; engraulids; carangids; bregmacerotids; nemipterids; scombrids; and synodontids). The empty stomach ratio and stomach fullness index did not differ significantly between the sexes and size classes. The stomach fullness index of juvenile barracudas (16-29 cm in length) was significantly higher as compared to adults in the medium (30-55 cm) and large (56-99 cm) size groups. Additionally, an analysis of dietary preferences revealed that small (juvenile) barracudas (16-29 cm) primarily consumed crustaceans, while medium-sized individuals (30-55 cm) preferred mollusks, and large individuals (56-99 cm) favoured teleost. The present study provides detailed information on the feeding ecology of the S. putnamae, for the first time from the Pakistan coast that will be useful for understanding trophodynamics of species developing effective management and conservation measures, ensuring the species' long-term viability.
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    Metals levels in Sarda orientalis collected from the commercial landings of Karachi Fish Harbor, Pakistan (northern Arabian Sea) and assessment of likely health risks to the consumers
    (Taylor & Francis Inc, 2023) Ahmed, Quratulan; Bat, Levent; Oztekin, Aysah; Ali, Qadeer Mohammad; Ghory, Farhana Shafiq; Yousuf, Farzana
    Anthropogenic activities are the major source of chemical pollutants including heavy metals in the coastal ecosystem which may accumulate in the aquatic organisms through the food web. Metal contamination in the marine fish pose serious threat to human health. This study deals with the human health risks of metal accumulation from Sarda orientalis consumption. The quantities of heavy metals were investigated in muscle, gills, and liver of striped bonito from the commercial landings of Karachi Fish Harbor, Pakistan (northern Arabian Sea). Risk for human health was evaluated by iron, zinc, manganese, copper, lead, cadmium, estimated daily intake, hazard index, and risk index. The hazard index value is <1, indicating that the estimated exposure is below reference dose for the relevant metals for monsoon, winter, and pre-monsoon. The mean hazard index for iron, zinc, manganese, copper, lead, and cadmium was 1.20 x 10(-2) for consumers. The mean risk index of lead for S. orientalis was 7.39 x 10(-9). As a result, the metals did not exceed the World Health Organization's and the United States Environmental Protection Agency's toxicological reference.
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    Morphological Description of Megalopal Stages of Three Portunid Species (Decapoda, Brachyura, Portunidae) from Indus Deltaic Area (northern-Arabian Sea)
    (Natural and Engineering Science, 2023) Inam, Urwah; Ali, Qadeer Mohammad; Ahmed, Quratulan; Bat, Levent
    The larvae of crustaceans, including those of brachyuran crabs, are a significant part of zooplanktonic communities constituting an ecologically important fraction of the pelagic communities. The present study describes taxonomic studies on three megalop stages of Portunus pelagicus (Linnaeus, 1758), Charybdis feriatus (Linnaeus, 1758) and Carcinus maenas (Linnaeus, 1758) belonging to family Portunidae collected from Indus deltaic creek system. Zooplankton samples were collected from three locations: Shahbandar 24°15’48.083’N, 67°90’15’333’E, Ketibandar 24°9’16.06’N, 67°27’7.64’E and Korangi creek 24°48’18.80’’N, 67°12’30.31’E during April to October 2018. No data available on taxonomic studies of portunid megalops upto species level from Paksitan, hence this is a first attempt to examine and to describe taxonomic features of megalops collected in the zooplankton samples. This study will contribute to the scientific knowledge on megalops taxonomy and identification as well as be useful for future research by taxonomists and biologists. © 2023, Natural and Engineering Science. All rights reserved.
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    Preliminary Study on Abundance of Microplastic in Sediments and Water Samples Along the Coast of Pakistan (Sindh and Balochistan)-Northern Arabian Sea
    (Central Fisheries Research Inst, 2022) Ahmed, Quratulan; Ali, Qadeer Mohammad; Bat, Levent; Oztekin, Aysah; Memon, Sehrish; Baloch, Azizullah
    Plastic material dominates our life and accordingly, it dominates the environment as a pollutant. Pakistan coasts are facing with plastic pollution problem like the rest of the world. The number and types of microplastics found in sea water and sediment samples from 25 locations along the Arabian Sea coast of Pakistan were explored in this study. The results of the present study show that the region is under a high pollution from microplastics. Microplastic abundance in seawater was found as mean 582.12 +/- 246.14 particle. L-1 and in sediment samples was mean 987.40 +/- 617.06 particle.kg-1 dry sediment. Microplastic concentration was maximum in Manora both seawater and sediment samples. Fibers were major contribution to total microplastics, up to 99% of all samples both seawater and sediment samples.
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    Seasonal Abundance of Fish Larvae in Shahbandar Creek, Indus Deltaic Area, Sindh
    (Springer Int Publ Ag, 2025) Ali, Qadeer Mohammad; Ahmed, Quratulan; Elahi, Naeema; Mavruk, Sinan; Bat, Levent
    The availability of near-shore vegetated environments, such as seagrass meadows and mangroves, plays a crucial role in maintaining the sustainability of fish stocks. The present study investigates the seasonal changes of abundance of fish larvae in Shahbandar Creek, Indus Delta region, Sindh from April 2018 to January 2019. Physico-chemical characteristics of sea water were measured, including air and water temperature (degrees C); salinity (ppt), dissolved oxygen (mg/L); pH and transparency (cm). The highest seasonal larval abundance values were observed in inter-monsoon period (October) through 500 mu m (39 ind./100m3) and 250 mu m (62 ind./100m3) mesh size. The most abundant families were Clupeidae (24%), Carangidae (13%), Gobiidae (19%), Sciaenidae (12%), Engraulidae (15%) and Syngnathidae (17%) during the study period.
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    Seasonal effects on length-weight relationship and condition factor of Holothuria pardalis (Holothuroidea: Echinodermata) collected from Karachi coast-Northern Arabian sea
    (Cahiers De Biologie Marine, 2019) Ahmed, Quratulan; Bilgin, Sabri; Ali, Qadeer Mohammad
    This study was conducted to determine the effects of seasonal variation on condition factor (CF) and weight length relationships (WLRs) in Holothuria pardalis collected during January to December 2016. Total (n = 452) sample of H. pardalis were collected during pre monsoon, monsoon and post monsoon season from two rocky shores of Buleji and Sunehri coast of Karachi. The highest mean length 17.1 +/- 0.70 cm and weight 20.3 +/- 0.63 g were recorded in post-monsoon season and minimum length 10.7 +/- 0.59 cm and weight 14.0 +/- 0.72 g were recorded in pre-monsoon season. The results showed that H. pardalis has negative allometric (b < 3) growth characteristics in all seasons (P < 0.05) as it appears to be the general case in other holothurian species. One-way ANOVA test showed that the CF values were statistically difference among three seasons. The mean CF values in Buleji area were estimated statistically higher than in Sunehri in pre-monsoon and monsoon (P < 0.05). But, it was estimated lower in Buleji area than Sunehri area in post-monsoon (P < 0.05).
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    Two New Records of Eunicidae (Annelida, Errantia) Along the Makran Coast of Pakistan, Northern Arabian Sea
    (Natural and Engineering Science, 2023) Ali, Qadeer Mohammad; Ahmed, Quratulan; Mubarak, Shumaila; Baloch, Ateeqa; Bat, Levent; Qazi, Hafsa; Shaikh, Iqra
    The Makran coast of Pakistan in the Northern Arabian Sea is a region of high biodiversity yet remains relatively under-studied in terms of polychaete fauna. In this study, we presented detailed morphological and taxonomical analyses of two newly discovered species of Eunicidae polychaetes, Eunice indica and Lysidice ninetta, collected during low tide from the intertidal zone of two stations along the Makran coast: Shamal Bandar, Pasni dated 31st January 2022 and Taak Beach, Ormara, dated 31st January 2022. Before our study, only 12 species of Eunicidae were known to occur in Pakistan. The identification and description of E. indica and L. ninetta provide important information about the distribution and taxonomy of Eunicid polychaetes on the Makran coast. These findings emphasize the need for further investigations and highlight the potential for discovering additional species within the region. © 2023, Natural and Engineering Science. All rights reserved.