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Natural spawning, egg and fry production of milkfish, Chanos chanos (Forsskal), broodstock reared in concrete tanks 1
Author(s) -
Emata A. C.,
Marte C. L.
Publication year - 1994
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1994.tb00139.x
Subject(s) - broodstock , milkfish , biology , fishery , zoology , stock (firearms) , aquaculture , fish <actinopterygii> , mechanical engineering , engineering
Summary Gonadal maturation, rematuration, and spawning of nine‐ (1982 stock) and ten‐year‐old (1981 stock) milkfish reared in 150 and 200 m 3 concrete tanks were observed in 1990 and 1991. From 23 September to 9 November 1990, the 1981 stock spawned 15 times with an average daily collection of 61,000 ± 21,000 eggs. From 4 larval rearing trials, the mean overall survival rate (from eggs to 21 ‐day‐old fry) was 9.68 ± 4.3%. From 25 Aril to 31 October 1991, the stock spawned a totaf of 108 times. Mean daily egg collection increasef to 305,000 ± 32,000. Successful rearing trials conducted during the latter part of the spawning season had a mean overall survival rate of 17 ± 3% (n = 17) indicating that mass fry production techniques can be improved. Spawning of milkfish broodstock in concrete tanks provides an alternative to other existing methods of seed production.