This study aimed to evaluate Pacific white shrimp larval quality from several shrimp breeding centers in East Java. parameters measured include 1) bolitas, 2) abundance of Vibrio spp. (water and shrimp body), and 3) muscle gut ratio (MGR). Larval samples were collected from 8 hatcheries located in East Java. The results showed that the percentage of bolitas in the hepatopancreas organ of shrimp larval in ponds 6, 7, and 8, respectively was <35%. Larval guts were found in all hatcheries, except for the 2nd pond as many as 60%. The highest abundance of Vibrio spp. (yellow colonies) in water samples and fry bodies was found in the 6th pond (26.5 × 103 CFU mL-1) and the 4th pond (76.9 × 103 CFU gr-1). The abundance of Vibrio spp. (green colony) and the highest water sample was found in the 3rd pond (3.8 × 103 CFU mL-1), while the larval was not detected. The larval found the highest percentage of MGR in the 3rd pond (87.5%), and the lowest was in the 7th pond (57.50%). Overall, our results demonstrate the infection of Vibrio spp. has involvement in the incidence of zoea syndrome in pacific white shrimp fry in hatcheries.
The mass death of tilapia (Oreochromis mossambicus) is the cause of the outbreak of mass death of cultured fish in floating net cages in Batur Lake, Bangli, Bali. The data were collected employing a field survey as material for formulating countermeasures. The sampling area is the Batur Lake, Bangli area, the center for tilapia cultivation in Bali Province. The results of our field investigation show that the upwelling phenomenon caused the cause of the mass death that occurred. The incident happened at the beginning of August, which began with changes in water temperature and wind direction (wind-driven motion). Changes in water temperature cause a mass of nutrient-rich water to move to the lake's surface, thereby reducing dissolved oxygen (DO) levels, which are contained in the water. The high stocking density and accumulation of nutrients from agricultural and anthropogenic activities are the main factors for this outbreak. With this outbreak of mass mortality of cultured fish, the government and relevant authorities are expected to manage the health of the aquaculture environment wisely and issue circulars regarding this case, especially in the center of tilapia cultivation in Batur Lake.
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