GONADAL DEVELOPMENT AND SPAWNING FREQUENCY OF TILAPIA (Oreochromis niloticus) THAT FEEDED BY VITAMIN E SUPPLEMENTATION

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ABSTRACT: Vitamin E is one of important micronutrient that influence the performance of fish reproduction. The purpose of the study was to know then effect of vitamin E on the gonadal development and spawning frequency of tilapia broodstock. The test diet was formulated containing 35% of crude protein and 10% of crude fat respectively. The feed formula was supplemented with vitamin E (level of purity 50%) as much as A) 0, B) 75, C) 150, D) 225, E) 300 and F) 375 mg/kg feed. One hundred eighty fishes (6-7 months of age) were used in the study and held in 6 nets in 6000 m 2 pond and water level on 80 cm. Each net was stocked with 20 females and 10 males of fish and keep for 13 weeks on September until November 2011. The result of the study showed that supplementation vitamin E in tilapia feed gave higher value of gonado somatic index than tilapia broodstock without supplementation of vitamin E in feed. The result also showed that supplementation vitamin E as much as 225 mg/kg feed gave the highest percentage of maturation (80%) and the highest value of spawning frequency on female tilapia (22 times during 13 weeks of maintenance). Based on the evaluation in those parameters it was concluded that supplementation of α-tocopherol up to 225 mg/kg can be useful for improving gonadal development, the number of mature female, percentage of maturation and value of spawning frequency on female tilapia.
Key words: vitamin E, gonadal development, spawning frequency and tilapia broodstock
Author: Wahyu Pamungkas, Evi Tahapari, Jadmiko Darmawan
Journal Code: jpbiologigg140008

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Jp Biologi gg 2014