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Effect of Two Thermal Regimes on the Muscle Growth Dynamics of Sea Bass Larvae, Dicentrarchus labrax L.
Author(s) -
Ayala Mª. D.,
López Albors O.,
García Alcázar A.,
Abellán E.,
Latorre R.,
Vázquez J. Mª.,
Ramírez Zarzosa G.,
Martínez F.,
Gil F.
Publication year - 2003
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1046/j.1439-0264.2003.00482.x
Subject(s) - dicentrarchus , sea bass , muscle hypertrophy , hatching , larva , biology , metamorphosis , serranidae , anatomy , zoology , bass (fish) , muscle fibre , muscle tissue , fishery , skeletal muscle , endocrinology , fish <actinopterygii> , ecology
Summary Muscle growth was studied in larvae of sea bass, Dicentrarchus labrax L., reared at two temperatures: real ambient temperature (≅15°C during vitelline phase and increased gradually) and 19°C from fertilization until the end of larval development. Muscle cellularity, body length and body weight were measured. Early temperature influenced larval development and so, pre‐larval phase finished earlier at 19°C than at ambient temperature (4 and 6 days, respectively). Temperature also affected muscle growth such that at hatching and at mouth opening hypertrophy of muscle fibres was greater at 19°C ( P < 0.05), whereas hyperplasia was similar in both groups. After 25 days, the cross‐sectional area of the white muscle was greater at 19°C ( P < 0.05), which was mainly associated with a higher proliferation of new white muscle fibres. At this stage the body length was also higher at 19°C. Metamorphosis finished earlier in fish reared at 19°C (52 days) than at natural temperature (82 days). At this developmental stage body length and cross‐sectional area of the myotome were similar in both groups. However, muscle cellularity differed between groups. Thus, hypertrophy of muscle fibres was higher in fish reared at ambient temperature ( P < 0.05), whereas proliferation of new muscle fibres was higher at 19°C ( P > 0.05).