Morphoanatomic Characteristics of Two-Spot Catfish (Mystus nigriceps) Caught in the Klawing River, Indonesia

Abstract

The population of Two-spot Catfish Mystus nigriceps had been detected decreased as a result of overfishing. This highlighted the necessity of finding ways protecting the fish in order to prevent its extinction. This study set out to ascertain the morphoanatomical characteristics of the fish's reproductive process. Random sampling method was employed in this study, and samples of fish were obtained from three different stations namely Jetis, Bokol, and Kedungbenda. The samples were then subjected to morphoanatomical indices, such as the gonado-somatic GSI, hepato-somatic HSI, and viscero-somatic VSI indexes. In addition, sex ratio measurements were also measured in this study. The results indicated that GSI of the male and female fish at each station ranged from 22.66-29.09% and from 26.03-36.78%, according to the data. The VSI of fish varied from 13.83-17.76%; 15.36-17.17%, and the HSI of male and female fish ranged from 11.81-15.18%; 12.69-16.56%. The results also show that the sex ratio of two-spots catfish found in the Klawing River shows a significant balance at each station, namely 1:1, where male two-spots catfish are 50% and females are 50%. This result indicates that the reproductive process of the two-spots catfish is in good condition. Water quality parameters in accordance with standards. It has been found in this study that two-point catfish meet the conditions for reproduction since they have reached the gonadal maturity phase. One of the factors that significantly affects the maturity of the ovaries and testes is the living habitat of the fish. Based on the results of morphoanatomical observations, it can be concluded that the condition of Two-Spot Catfish (Mystus nigriceps) obtained from the capture in the Klawing River is in a mature gonadal condition and ready for spawning.