THE EFFECT OF DIFFERENT LEVELS OF DIETARY N-3 FATTY ACID ON THE REPRODUCTIVE PERFORMANCE OF ZEBRAFISH (Brachydanio rerio)
Abstract: This experiment was
conducted to determine the dietary n-3 fatty acid requirement for reproduction
of broodstock zebrafish, Brachydanio
rerio. Three isonitrogenous (39% crude protein)
and isocaloric (3,260 kcal digestible energy/kg diet) practical diets, namely
diets A, B, and C, with different levels of fatty acids were fed to zebrafish
broodstock. The broodstock were
cultivated in aquaria. Diet A contained
low dosage of n-3 fatty acids (0.4%) and 2% n-6 fatty acids, while diets B
and C contained 2% n-6 fatty acids,
combined respectively with 1% and 1.5% n-3 fatty acids. Fish were fed ad satiation for 60 days using these
diets. During feeding periode, gonade
maturation stages were examined. The n-3
and n-6 fatty acids affected fecundity, fertilization rate, and hatching
rate. On the other hand, fish fed on
diets A, B, or C did not show any significance differences in the gonade
somatic index and total Survival Rate (SR) of larvae produced. Fish fed on diet B produced the highest
fecundity (616 eggs/g of fish), fertilization rate (94.6%), and hatching rate
(93.8%). The total lipid content of eggs
were significant, ranging from B (29.7%), C (23.7%), and A (16.1%). At a dosage of 2% n-6 fatty acids, zebrafish
require 1% of dietary n-3 fatty acids in the diet for reproduction. Excess dosage of n-3 fatty acid in the diet
adversely affected fecundity, fertilization rate, and hatching rate.
Author: Nur Bambang Priyo
Utomo, Ing Mokoginta, and Lia Nurmalia
Journal Code: jpperikanangg060006

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