Evaluation of humpback grouper, Cromileptes altivelis reproduction because of mating between males from the wild and females from cultivation

Abstract

There has been a tendency to decrease the genetic quality of aquaculture commodities, which is a significant problem to be addressed immediately. The study aimed to evaluate the reproduction of humpback grouper broodstock resulting from crossbreeding male broodstock from the wild with female broodstock from captivity. This research used 2 (two) concrete tanks 75 m3 in volume. Each tank was filled with 25 females comprising 15 cultured and 10 broodstock from the wild and conducted from March to November. The broodstock feed consists of fresh fish and squid. The treatment given is the difference in vitamins given. The Tank A was fed an additional vitamin mix, while in Tank B was fed extra vitamins C and E. Recorded parameters such as egg production, egg hatching rate, egg size, spawning frequency, and oil droplet size. The results of humpback grouper reproduction showed that providing fresh trash fish, squid, vitamin C, and vitamin E in the feed yields better results. The spawning frequency was higher in tank B, with 22 times occurrences, compared to tank A, with 17. The highest number of eggs was observed in October, with up to 1,395,000 eggs in Tank B and 1,150,000 in Tank A.