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Influence of temperature on egg hatching, growth and survival of larvae of Heterobranchus longifilis Val. 1840 (Teleostei: Clariidae)
Author(s) -
Nwosu By F. M.,
Holzlöhner S.
Publication year - 2000
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 - 10.1046/j.1439-0426.2000.00144.x
Subject(s) - hatching , biology , teleostei , zoology , human fertilization , larva , incubation , egg incubation , ecology , fishery , anatomy , fish <actinopterygii> , biochemistry
Eggs of Heterobranchus longifilis Val. 1840 were artificially fertilized and incubated at a range of temperatures (20, 23, 25, 27, 29 and 32°C). The time from fertilization to hatching decreased with increasing temperature. No eggs survived to hatch at 20 and 32°C incubation temperatures, while at 23 and 29°C hatching was only minimal. Optimum hatching was obtained at 25 and 27°C, which corresponds to the ambient temperature range during the breeding season. Larvae of H. longifilis were reared for 11 days post‐hatching at 20, 25, 27, 29 and 32°C. Growth increased with temperature (P < 0.05), whereas survival depicted an inverse relationship. Growth was minimal at 20°C and larvae rarely survived to the end of the experiment. Optimum temperature for the primary nursing of H. longifilis larvae was within the 25–27°C temperature range.