STUDY ON MATING RATIO OF PORTUGUESE OYSTER BROODSTOCK (CRASSOSTREA ANGULATA) FOR ARTIFICIAL FERTILIZATION IN HATCHERIES IN VIETNAM

Vũ Văn Sáng

doi:10.34238/tnu-jst.7994

STUDY ON MATING RATIO OF PORTUGUESE OYSTER BROODSTOCK (CRASSOSTREA ANGULATA) FOR ARTIFICIAL FERTILIZATION IN HATCHERIES IN VIETNAM

About this article

Received: 22/05/23 Revised: 04/08/23 Published: 04/08/23

Authors

Vu Van Sang , Faculty of Biology, University of Science, Vietnam National University; Research Institute for Aquaculture number 1

Abstract

The study was carried out to determine the suitable mating ratio of Portuguese oyster broodstock (Crassostrea angulata) for artificial fertilization. C. angulata broodstock used for the experiment were above 50 gram each. The experiment was designed with 4 different treatments: 1) Treatment 1: 1 male and 1 female; 2) Treatment 2: 1 male and 5 females; 3) Treatment 3: 1 male and 10 females; 4) Treatment 4: 1 male and 15 females with three replicas for each. For artificial fertilization, sperm and eggs were striped. Results show that the treatment 2 had fertilization rate of 85.5%; hatching rate of 86.5%; metamorphomosis rate to D larvae of 75.6%, similarly was found in the treatment 3 with fertilization rate of 87.5%; hatching rate of 85.2%; metamorphomosis rate to D larvae of 75.4%. The treatments 2 and 3 indicate significantly higher fertilization, hatching rates and metamorphomosis rate to D larvae than the treatment 1 and 4 (P<0.05). Therefore, fertilization rate of 1 male with 5 to 10 females will bring about the highest efficiency of artificial fertilization of Portuguese oyster hatcheries in Vietnam.

Keywords

Portuguese oysters; Crassostrea angulate; Fertilization rate; Hatching rate; Metamorphosis rate

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DOI: https://doi.org/10.34238/tnu-jst.7994

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