Authors

Chia-Lin Lee

Document Type

Internship Report

Publication Date

Fall 2013

Abstract

Grouper is an important aquaculture fish species in Taiwan. The productivity of grouper fingerlings is not stable because natural disasters, mainly typhoons, often alter the pond environment where the fish is grown. The grouper larvae in the early stage may die easily because of lack of food caused by severe weather. However, the live feed in later stage of larvae, artemia, can be grown quickly and easily. Thus, the alternative feed methods of the early stage larva was tested and compared in this experimental trial. Some improvements were required to adapt Seafood Dynasty Company’ s lab used for running the trials. This is one of a few labs raising larvae in tanks in Taiwan. Hence, there are two parts in this report: 1. The environmental cleaness improvement of the Seafood Dynasty Company Lab; and 2. The artificial feed added in different quantities and in combination. Surface cleaner with aeration led to the largest decrease in larval survival rate. This can be interpreted as the increase of aeration to surface cleaner may increase the mortality of larvae, but the effect of aeration is not obvious in the larger fish. The alternative feed added to the tank may disappear slower.The growth may be enhanced by adding more feed, but the water quality will be worsened. Feeding enriched live feed may be better than non- enriched because the density of live feed can be maintained for longer periods of time. In summary, feeding live feed at the appropriate densities will improve growth and survival of grouper. It is suggested that alternative feeds to replace the live feeds be used only in emergency periods when live feeds crash or are reduced dramatically.

Comments

Department: MAF

MPS Track: AQU

Location: Seafood Dynasty Company Lab, Taiwan

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