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Hormone‐induced ovulation and spawning of captive and wild broodfish of the catadromous Australian bass, Macquaria novemaculeata (Steindachner), (Percichthyidae)
Author(s) -
Battaglene S C,
Selosse P M
Publication year - 1996
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.1365-2109.1996.tb00984.x
Subject(s) - spawn (biology) , biology , broodstock , hatching , bass (fish) , fishery , human fertilization , micropterus , induced ovulation , zoology , ovulation , seasonal breeder , winter flounder , catfish , artificial fertilization , flounder , aquaculture , endocrinology , hormone , anatomy , fish <actinopterygii>
Australian bass, Macquaria novemacideata (Steindachner),mature but do not spawn in fresh or brackish water ponds. Ovulation and spawning of captive (n = 158)and wild Australian bass (n = 123) was induced in the normal breeding season by single injections of human chorionic gonadotropin (hCG). Doses of 100‐4000IU kg‐“ hCG induced ovulation and the optimum dosage was 500 IU kg” hCG. The breeding season was from mid‐May to late August for wild fish,and extended into September for captive fish. There was a tendency for mean fertilization and hatching success to decline over the breeding season. Greater fertilization and hatching success was obtained from fish which spawned naturally than from stripped fish. Fish spawned after 34,2 ± 0.4 h (mean ± SE, n = 74). Ovulating fish that failed to spawn were stripped after 40.2 ± 0.3 h (n = 76). The timing of stripping and fertilization was an important factor determining hatching success. There was no apparent difference in latency periods or the number of eggs spawned between captive and wild fish. However, the mean number of eggs obtained from naturally spawned fish was higher than for stripped fish. The techniques described in this paper will assist the largescale production of Australian bass by increasing the quality and quantity of larvae from hCG‐induced spawnings.