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An evaluation of two types of containers for the artificial incubation of Oreochromis eggs
Author(s) -
RANA K. J.
Publication year - 1986
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1986.tb00095.x
Subject(s) - oreochromis mossambicus , biology , broodstock , oreochromis , incubation , hatching , human fertilization , zoology , milt , fishery , tilapia , fish <actinopterygii> , anatomy , aquaculture , biochemistry
. Conical and round‐bottomed incubating containers were evaluated for efficiency in producing Oreochromis fry. For O rcochromis niloticus (L.) and Oreochromis mossambicus (Peters): 0‐, 12‐, 24‐, 48‐ and 72‐h‐old egg clutches were artificially incubated at 28°C in conical and round‐bottomed containers. Hatching occurred within 72–84h and 90–102h after fertilization respectively compared to 96–120h for naturally incubated egg clutches. No significant differences (P > 0·05) were found between the hatch and survival rates of O. niloticus and O. mossambicus fry or between fry from the various ages of eggs. The type of containers, however, significantly ( P < 0·05) influenced the hatchability and survival rates, the overall survival rate from fertilization being 60% and 85% for conical and round‐bottomed containers respectively. Possible reasons for these differences are discussed. The feasibility of using the superior round‐bottomed containers for artificial egg and fry incubation and the advantages for broodstock management to mass produce Oreochromis fry are discussed.