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Effects of different photoperiod conditions on juvenile tench ( Tinca tinca L.) under intensive rearing
Author(s) -
Carral J. M.,
García V.,
Celada J. D.,
González R.,
SáezRoyuela M.,
González Á.
Publication year - 2014
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/jai.12424
Subject(s) - photoperiodism , biology , juvenile , darkness , zoology , fish <actinopterygii> , fishery , ecology , botany
Summary Two 120‐day experiments with 5‐month‐old juvenile tench ( Tinca tinca L.) were conducted to evaluate different photoperiod conditions. In the first experiment, juveniles were exposed to natural winter photoperiod (ca. 11 h light: 13 h dark), continuous light or continuous darkness. In the second experiment, two photoperiods were tested: natural winter or an extended photoperiod (16 h light: 8 h dark). In all cases, survival was high (95.8–100%). In the first experiment, tench under the natural winter photoperiod had the highest growth (52.3 mm TL , 1.84 g W, 1.28% d −1 SGR ). In the second experiment, the extended photoperiod enabled a significantly higher growth (56.8 mm TL , 2.51 W g, 1.75% d −1 SGR ) than in the natural winter photoperiod. Percentages of deformed fish ranged from 1 to 31.2%.