The Analysis of Cockle (Anadara inaequivalvis) Gonad Maturity Level in the Estuary of Banjar Kemuning River, Sedati, Sidoarjo

Abstract

Cockle (Anadara inaequivalvis) is aquatic biota belonging to the mollusk group. Cockle has a high potential because all parts of its body can be processed and economic value. Cockle can be used for consumption and the shells can be used as jewelry. According to the data from WWF Indonesia (2017), the production of cockle in the estuary of Banjar Kemuning River from 2006-2016 decreased in average by 0.84% every year. One of the efforts in maintaining the availability of cockle in the waters is conducting research on the analysis of gonad maturity level on cockle. The purpose of this research is to learn the morphological structure and histological structure of cockle gonad (Anadara inaequivalvis) in the estuary of Banjar Kemuning River at different levels of gonad maturity and to learn the maturity level of cockle gonad (Anadara inaequivalvis) in the estuary of Banjar River Kemuning through morphological and histological observation. This research used descriptive method with data collection by field observation. The sampling technique used the method of quota sampling. The analysis result shows that gonad maturity level of cockle in the estuary of Banjar Kemuning River in December is dominated by TKG IV, in January is dominated by TKG I, and in February is dominated by TKG II. The male cockle’s first mature gonads are at the shell length of 35.73 mm (34.55-36.91 mm) and female cockle’s first mature gonad are at the shell length of 37.21 mm (36.06-38.37 mm).