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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 Changes of Ichthyoplankton Assemblages of Sinop Coasts in Southern of the Black Sea, Turkey
    (Central Fisheries Research Inst, 2014) Satilmis, Hasan Huseyin; Mavruk, Sinan; Bat, Levent; Avsar, Dursun
    The Black Sea is an important ecosystem in Turkish marine fisheries. The early stages of economical fishes of the Black Sea can be considered well known; however, there are significant data deficiencies on ichthyoplankton assemblages and their structures. Therefore, seasonal changes of structure and dynamics of ichthyoplankton assemblages of Sinop coasts (South-Central of the Black Sea, Turkey) were investigated in this study. For this purpose monthly vertical and horizontal standard plankton net tows had been conducted at six sampling stations from two different regions (Inner and Outer Harbours) between 2002 and 2005. Species richness, diversity, abundance and similarity structures were used as ecological indicators to investigate ichthyoplankton assemblages. Planktonic stages of 27 fish species were collected during the studying period. The maximum species richness expectancy was 34 species. Seasonal changes of richness were significant (P<0.05). The groupings of similarity matrices were also explained by seasonal effects for both embryonic and larval stages (P<0.05). In conclusion, the ichthyoplankton assemblage structures of the studying area were generally shaped by seasonal spawning patterns of adult populations.
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    Öğe
    Seasonal changes of ichtyoplankton assemblages of Sinop coasts in southern of the Black Sea, Turkey
    (Turkish Journal of Fisheries and Aquatic Sciences, 2014) Satılmış, Hasan Hüseyin; Mavruk, Sinan; Bat, Levent; Avşar, Dursun
    The Black Sea is an important ecosystem in Turkish marine fisheries. The early stages of economical fishes of the Black Sea can be considere d well known; however, there are significant data deficiencies on ichthyoplankton assemblages and their structures. Therefore, seasonal changes of structure and dynamics of ichthyoplankton assemblages of Sinop coasts (South - Central of the Black Sea, Turkey ) were investigated in this study. For this purpose monthly vertical and horizontal standard plankton net tows had been conducted at six sampling stations from two different regions (Inner and Outer Harbours) between 2002 and 2005. Species richness, divers ity, abundance and similarity structures were used as ecological indicators to investigate ichthyoplankton assemblages. Planktonic stages of 27 fish species were collected during the studying period. The maximum species richness expectancy was 34 species. Seasonal changes of richness were significant ( P <0.05). The groupings of similarity matrices were also explained by seasonal effects for both embryonic and larval stages ( P <0.05). In conclusion, the ichthyoplankton assemblage structures of the studying are a were generally shaped by seasonal spawning patterns of adult populations.
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    Öğe
    Seasonal changes of ıchthyoplankton assemblages of sinop coasts in southern of the black sea, Turkey
    (2014) Satilmiş, Hasan Hüseyin; Mavruk, Sinan; Bat, Levent; Avşar, Dursun
    Türkiyede deniz balıkçılığı açısından son derece yüksek öneme haiz olan Karadeniz ekosisteminde, özellikle ticari değere sahip balık türlerinin erken yaşam evreleri üzerine yapılmış birçok çalışma bulunmasına karşın, ihtiyoplankton toplulukları ve bunların yapısal özelliklerinin tümüyle açığa kavuşturulduğu söylenemez. Bu çalışmanın konusunu Sinop kıyısındaki ihtiyoplankton dağılımının yapısı ve mevsimsel değişimleridir. Bu amaçla 2002 -2005 yılları arasında standart plankton ağı kullanılmak suretiyle, iç ve dış liman bölgelerindeki altı istasyondan aylık olarak yatay ve dikey plankton örneklemeleri gerçekleştirilmiştir. İhtiyoplankton topluluklarının yapısını analiz etmek için tür zenginliği, çeşitliliği, bolluğu ve toplulukların benzerliği ekolojik belirteçler olarak ele alınmış tır. Çalışma süresince 27 türe ait erken evrelerle karşılaşılmış, bölge için beklenen maksimum tür zenginliği 34 tür olarak bulunmuştur. Tür zenginliğ inin mevsimsel değişimi istatistik açıdan önemli bulunmuştur (P0 ,05). Ayrıca, hem embriyonik hem de larval aşamalar için benzerlik matrislerinde gözlenen gruplaşmalar önemli ölçüde mevsimlerle açıklanmıştır (P0 ,05). Sonuç olarak çalışma alanındaki ihtiyo plankton topluluklarının yapısal özelliklerinin büyük ölçüde ergin popülasyonların üreme davranışlarıyla açıklanabileceği neticesine varılmıştır.