Gonad maturity of simping Placuna placenta, Linn 1758 (Bivalve: Placunidae) harvested from Kronjo Coastal, Indonesia

Abstract

Simping (P. placenta) is a coastal resource found in shallow water with a muddy substrate. Simping widely used as a source of food and as raw material for the decoration. Utilization of simping until now has not yet focused on recruitment, reproductive aspect. This information is important as a basis data for determining the size of the simping catch. This study aimed to find out about of reproduction aspect, determining sex ratio the size of the catch simping. This research was conduct for three months at 3 locations. The number of samples in the analysis is 36 species to determine sex ratio and gonad maturity. Sex ratio indifferent from male and female, but based on the time sex ratio of simping significant, both male and female. The length size of gonads shellfish matures form 5.50 cm and 5.85 cm at 2 TKG conditions. Length of simping mature from 6.08 cm, 6.24 cm, 6.45 cm and 7.11 cm dominant at TKG mature stage 3, and 8.61 cm dominant at 4 TKG conditions. Sex ratio reaches 6 cm shell length and not significant between males and females (M: F=1;1). It is concluded that the level of maturity of gonads increases with increasing of simping size.

Morfometric of Placuna placenta from Wulan Estuary, Demak, Indonesia

“…The Windowpane oyster has a role in maintaining a balanced ecosystem through trophic levels. In the ecological chain, it is one food source for crustaceans and carnivore fish of the grouper group such as the family Lutjanidae [29]. Like other Indo-Pacific countries, Indonesia has extensively collected P. placenta from the wild.…”

Perkembangan Gonad Kerang Insei (Asaphis violascens) Di Perairan Pesisir Yenusi Biak Timur, Papua

“…Perkembangan gonad pada kerang simping (Placuna placenta) di perairan Kronjo, dimulai pada undeveloped (gonad belum dapat dibedakan antara jantan dan betina), tahap developing stage, ditemukan folikel rongga tidak berkembang dalam kondisi yang lebih baik. Sebagian besar sel telur dalam rongga masih belum matang, pada tahap kematangan 3 (ripe), kondisi gonad telah matang (matang), seluruh sel rongga terdiri dari sel telur matang (ookista), inti telur berkembang, kematangan gonad tahap 4 (spawning), sel telur bersiap untuk musim pemijahan, ookista telah dikeluarkan dari rongga, dan sebagian rongga folikel mulai kosong (Yonvitner et al, 2020).…”

Bioaccumulation of Polycyclic Aromatic Hydrocarbons (PAHs) in simping scallops (Placuna placenta) from the Waters of Socah and Ujungpangkah, East Java

“…Their sizes range from 1.8 to 13.1 cm, with an average size of 3-8 cm within the population. Since scallops lack active mobility and function as non-selective filter feeders, they indirectly serve as bioindicators, providing valuable insights into the condition of their environment [4], [5]. Indonesian waters receive significant pollutant inputs, including heavy metals, PAHs compounds, and organic and inorganic waste from human activities such as fishing, transportation, ports, industrial operations, waste discharge from land, and human settlements.…”