Polyculture seaweed Gracilaria sp. and milkfish in the pond

Abstract

Seaweed Gracilaria sp. and milkfish are euryhaline fishery commodities. Both of these commodities can be cultivated by polyculture in ponds. Polyculture is a mixed cultivation technology between two or more commodities that can increase aquaculture production and provide value added cultivators as it can harvest several products in one season. Polyculture seaweed Gracilaria sp. and milkfish are done at Marana Experimental Pond Installation, Research Institute for Coastal Aquaculture, Maros South Sulawesi with extensive technology system, using 1 plot of pond size 10,000 m2. Preparation of the pond begins with the repair of dikes, patching leaks and repair of sluices. Next is draining ponds, eradicating pests with 20 ppm saponin, pond flushing, subsequent fertilizing and preparation of water for dispersal. Initial fertilization is done by using Urea and TSP fertilizers with doses of 100 and 50 kg/ha. Seaweed seed stocking in ponds as much as 2,000 kg/ha was done in March using a broadcast method, i.e., seed stocked in all parts of ponds. The milkfish seeds are also stocked with a dense stocking of 1,000 tails/ha. The first harvest of seaweed can be done after the maintenance period of 3.5 months. The next harvest can be done every 30-45 days. Total production of dried seaweed reached 8,284 kg/ha (5 times harvest/year) and milkfish harvest reached 375 kg/ha.