We studied animal's learning of spatial discrimination in an experimental environment. Turtles, Chinemys reevesii, were employed for the study. We focused on two independent aspects: (1) turtle's success rate in the task, which is the most common criterion to estimate the ability of the animals, and (2) the statistical properties of the time interval of the task, which is independent on the spa...

Present study showed that the over-all sex-ratio deviated in favour of females in Ilisha melastoma. However, the sexratio was approximately 1:1 in certain months while in others it was in favor of females. Similarly the sex-ratio deviated from 1:1 ratio in different size-classes. Minimum size at which the specimens of I. melastoma get matured is 14.9 cm in total length (11.5 cm in SL). Four mat...

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...

Abstract In order to study kidney changes in, Tenualosa ilisha during migration from sea to the river, twenty mature T. ilisha specimens were collected from the Persian Gulf (42.7ppt salinity and 29.27°C temperature) and twenty specimens from Arvand River (2.3ppt salinity and 21.16°C temperature). Macroscopic observation indicated that the kidney was located retroperitoneal and attached to...

A comparative study on the fatty acids contents of three Malaysian marine fishes Tenualosa toli (Terubok), Rastrelliger kanagurta (Kembong), Stolephorus baganensis (Bilis) and three freshwater fishes Channa striatus (Haruan), Pangasius hypothalamus (Patin), Clarias macrocephalus (Keli) were carried out. Marine fishes showed more unsaturated fatty acids with 3, 4, 5 and 6 double bonds than in fr...

Some aspects of the reproductive biology of Hilsa Shad, Tenualosa ilisha from the Persian Gulf and rivers of Khouzestan Province of Iran were analyzed. A total of 485 fish were sampled by gillnet from landing center of Arvand (AR) and Bahmanshir (BR) rivers during period of April 2010 to September 2010. Reproductive characteristic of T.ilisha showed that sex ratio is M: F=1:2, in PG, AR and BR....