ECOSYSTEM CONDITION AND GROWTH RATE PREDICTION OF BARRAMUNDI (LATES CALCARIFER) ON THE OFFSHORE FISHCAGE PLAN IN KARIMUN JAWA

• Main Author: Avrionesti
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25951
• Institution: Institut Teknologi Bandung

Barramundi (Lates calcarifer) is one of main fish catches in the demersal category which can grow optimally in salinity between 0 – 40 PSU and water temperature between 27 – 36 °C. High demand for Barramundi commodity prompted the Indonesian Ministry of Marine Affairs and Fisheries to cultivate Barramundi in Karimun Jawa using offshore fish cage technology. Ecosystem condition is assessed to predict the growth rate of Barramundi and its harvest production. Therefore, the ecosystem condition is being modeled, includes nutrient, phytoplankton, zooplankton, and detritus (NPZD) and their interaction with Barramundi as the highest predator on the food chain. The result shows that the growth rate of Barramundi is 4.07 gram/day with the fastest growth rate (latest) occurs if the seed is stocked in August (November) with growth rate 5,11 gram/day (3,1 gram/day). The slow growth rate of seeds stocked in November occurred because of crustaceans as the main feed of Barramundi in the early phase of the hatchery has a low abundance. At La Nina conditions, warmer waters decreasing the concentration of Barramundi’s feed by 0.1% and cause the average growth rate of Barramundi slower than the normal condition which is 4.03 gram/day. At El Nino condition, average water temperature is 0.24°C cooler and leads to the increase of the concentration Barramundi’s feed by 0.01% and accelerate the average growth rate of Barramundi to 4.09 gr/day.