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The effect of feeding rate on growth of pectoral fin spine of juvenile great sturgeon Huso huso (Linnaeus, 1758)
Author(s) -
Bakhshalizadeh Shima,
Bani Ali,
Abdolmalaki Shahram,
PoncePalafox Jesús T.
Publication year - 2019
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.13863
Subject(s) - huso , biology , sturgeon , juvenile , fish fin , zoology , fishery , fish <actinopterygii> , spine (molecular biology) , anatomy , ecology , microbiology and biotechnology
Summary The effect of two feeding rates (0.5 and 1.5% of total body weight) was assessed on the growth of pectoral fin spines of captive juvenile great sturgeon, Huso huso, after second year of life. The fish received Oxytetracycline (OTC) twice in the first and second years of their lives under basic diet. During the 5‐month experimental period, juveniles (mean 1,187.4 g, 0.1 standard deviation [ SD ]), n = 50) were reared with two feeding rates under similar conditions in 10 fiberglass tanks (1.5 m 3 ). The fish were fed manually with a commercial diet twice a day (35% Biomar, Nersac, France) throughout the experiment. The OTC marks were distinguished in all pectoral fin spine sections under ultraviolet light. The means of the first and second annular radii were 806.6 µm (27.2 SD ) and 2,246.5 µm (50.2 SD ), respectively. The marginal increment analysis beyond the second OTC mark revealed a significantly smaller marginal increment for low feeding rate treatment (143.9, 11.2 SD ) as compared to the high feeding rate one (269.0, 14.6 SD ). The results indicate the slower growth rate in the fish fed the low feeding treatments seen in the pectoral fin spine formation, which can be used as an indicator of recent feeding history in sturgeon juveniles. The best daily feeding rate for great sturgeon of 2,460 g was determined to be 1.5% body weight/day in this study.