Biology Of Macrognathus Sp. With Special Reference To Macrognathus Pancalus (Hamilton) And Macrognathus Aral (Bloch And Schneider)
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Abstract
Macrognathus is a genus of eel-like fish of the family Mastacembelidae of the order Synbranchiformes. The majority of South and Southeast Asia is home to these fish. The major food category of this genus is crustaceans (such as prawns) and aquatic insects (Chaoborus spp.), while juveniles mostly consume annelids (such as earthworms). According to various studies, it was found that the male: female ratio of Macrognathus sp is roughly 1:1. Macrognathus exhibit a wide range of fecundity, and the number of ova or eggs laid by a single female depends on a number of variables, including size, age, species, and the ecological habitats of the fish, including the availability of food. The fecundity of these fishes are found to be high when the fish were breeding, which occurred from May through August. The average ovarian diameter of M. pancalus has been found to increase on a monthly basis. In some studies, lentic habitats showed higher ova diameter than lotic habitats for Macrognathus sp. For Macrognathus sp. the males matured at lengths of 10 to 11 cm and females at lengths of 11 to 12 cm on the other hand M. aral was found to be matured at an average of 12.05 cm for males and 16.05 cm for females.
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