Bilih fish (Mystacoleucus padangensis) is a migratory fish that usually migrates from the lake to the river chiefly for spawning purpose. The growth as well as development of reproductive organs of this fish can be identified through morphology and histology. The later is considered as the most exact procedure which guide about basic information1 but this method is expensive and time consuming as well.
On the other hand, the former method (morphological identification) of gonads is the convenient, effortless and quick procedure but its accuracy is unsure2.
Investigations regarding reproductive biology of Bilih fish in Lake Singkarak as well as in the Lake Toba have done by many scientists. However, these researchers only reported fish gonad development bilih classification, based on the morphology of gonads.
Syandri3 applied histological methods to fish bilih Lake Singkarak but he only reported the condition of gonad developmental phases present at that time. This study didn’t provide detailed information about classification of bilih fish gonad development. Moreover, evaluation of gonadal development is also considered unsuitable as it is based on a fish belonging to different family as well.
Therefore, a new investigation was conducted to assess the reproductive biology as well as histology of female bilih fish of Naborsahan River, Lake Toba in Indonesia. For this purpose, sampling of fish done at six different stations on the basis of river characteristics and bilih fish habitat by utilizing bag net as well as cast net4.
At the end of this study, it was noted that considering morphological and histological analysis, the gonad developmental stages of female bilih fish can be divided into 5 stages; viz Immature, Pre mature, Maturing and Mature, Pre spent and Spent.
Moreover, Bilih fish spawning patterns were found to be partial and the spawning peak can be obseved in August-September and February-March. Conclusively, these outcomes can be useful for the management of this species.
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23 June, 2019