Parasite Prevalence Oodinium sp. in Cantang Hybrid Grouper Cultivated in Recirculating Aquaculture System

Abstract

The aims of this study were to determine clinical symptoms, mortality, prevalence, and histopathology of Cantang hybrid grouper fish infected with Oodinium sp. on the Cantang. The study was conducted by direct observation of clinical symptoms, calculating the number of fish mortality, and measuring the quality of water in the tank using the Cantang. While histopathology was conducted in the laboratory using 10 samples of sick fish with an average total length of 10.6 ± 0.69 cm and a weight of 18.6 ± 1.77 g. The results showed that the fish seen swimming weakly on the surface of the water near aeration or standing still at the bottom of the tub, decreased appetite, had pale or darker body color, and were thin. Observation of skin and gill mucus under a microscope showed the presence of ectoparasites Oodinium sp. in massive quantities in almost every gill sheet. The mortality of fish infected with Oodinium sp. in the Cantang of 26.84±3.9%, with a prevalence of 49.59%. Histopathologically the gill lamellae of fish infected with Oodinium sp. shows the occurrence of hyperplasia which causes the union of several gill lamellae.

The Effectiveness Of Citric Acid As An Anti-Ectoparasite Of Marine Leech (Zeylanicobdella arugamensis) Through Soaking

“…Cocoons in this study were maintained at room temperature ranging from 29-32°C with an average of 28.67±1.36°C. This value is in accordance with the life temperature of Z. arugamensis, because the prevalence of parasites can decrease with increasing temperature and the temperature range for grouper rearing is 25°C-27°C [13,30]. Temperature observations of citric acid solution for immersion of Z. arugamensis and its cocoons at concentrations of 100 to 400 ppm increased slightly (Table 3).…”

“…The cocoon development phase is in accordance with the cocoon development phase. The morula to gastrula phase occurs for 3-5 days followed by the embryo phase until hatching on days 10-12 at a rearing temperature of 28-31°C and salinity of 34-35 ppt, but cannot hatch at 40°C [13,17,19,25,30]. Cocoons in citric acid immersion at concentrations of 250 ppm and 400 ppm had no nucleus and did not develop until the end of the study.…”

Diagnosa Agen Penyakit Ikan Di Kecamatan Cibereum, Sukabumi, Jawa Barat

“…juga dilaporkan telah menyerang ikan kerapu hybrid cantang. Gejalanya terlihat dari siripnya yang terdapat lapisan tepung bernaa beludru, sisik atau kulit ikan terkelupas dan matanya tampak seperti mata ikan dengan membrane yang buram (Widiartini et al, 2022).…”