The analysis of net catches made in Absheron Gulfs of the Caspian Sea during 2011-2012 is provided. The ichthyofauna of Absheron Gulfs, including 26 species found in the North Gulf, and 33 species and subspecies found in the South Gulf was studied for the first time. A taxonomical and ecological diversity of the fish fauna of North and South Absheron Gulfs is characterized. The peculiarities of...

Fish pass monitoring is essential to ensure the device's effectiveness as a mitigation measure for river impoundment, guaranteeing longitudinal continuity of rivers, which particularly important diadromous fish that depend on obligatory migrations freshwater reproduction (anadromous) or feeding areas (catadromous) complete their life cycle. The upstream migration anadromous allis (Alosa alosa L...

Many species of odontocete cetaceans (toothed whales) use high-frequency clicks (60-170 kHz) to identify objects in their environment, including potential prey. Behavioral studies have shown that American shad, Alosa sapidissima, can detect ultrasonic signals similar to those of odontocetes that are potentially their predators. American shad also show strong escape behavior in response to ultra...

High prevalences of gonadal intersex have been observed in wild fish populations in areas affected by domestic and industrial effluents. For this study, fish were collected in 1998 from the Cootes Paradise region of Hamilton Harbour in western Lake Ontario, Canada, to determine whether gonadal abnormalities, including intersex, were present in young of the year (YOY) fish. No gonadal abnormalit...

The anadromous tropical Hilsa shad formed the largest single-species fishery in Bangladesh, making highest contribution to country’s total fish production (14%) and nearly 83% of global catch 2018. However, increased fishing pressure made vulnerable, hence, information on stock condition its response current degree removal is essential explore future potential for sustainable exploitation. This...

In a mesocosm experiment, we tested whether larval fish show an active behavioural response to hydrodynamic impacts. Exposing I to 3 week old allis shad (Alosa alosa) larvae to a pulsed wave regime, we found that already I week old larvae immediately adapt their microhabitat use and activity patterns at the onset of the wave pulses. The fish larvae in stantaneously increased their activity leve...

We studied the trophic structure of western Wadden Sea fish community through stable isotope analysis (δ 13 C and δ 15 N) 1658 samples from 57 species collected between 2012 2016. Stable values differed but did not vary years or seasons, only for some with size. were different immigrating (spring) emigrating (autumn) fish, suggesting a similar niche various in coastal zone inside Sea. For major...

Abstract Tenualosa ilisha also known as Hilsa shad is one of the important anadromous fish species in South Asia and some middle eastern countries because its economic, cultural ecological significance. The importance hilsa this region has driven a large number scientific studies quantification these to identify knowledge gaps future research directions. For purpose, we conducted scientometric ...