Growth dynamics of white myotomal muscle fibres in the bluntnose minnow, Pimephales notatus Rafinesque, and comparison with rainbow trout, Salmo gairdneri Richardson

Rainbow trout (15.5 cm) fed "ad lib." rations grew a little faster at 12 °C than at 16 °C, and both groups grew much faster than a third group at 12 °C receiving "3–4%" rations. Growth of the mosaic muscle mass was characterized by increase in fibre mean diameter, though most bulk increase (up to 25 cm or more) resulted from increase in fibre number. Fibre diameter: fish length was least in the fastest growing trout (12 °C ad lib.), signifying their greater ability to add new fibres during growth compared with the slower growing trout; diameter range increased markedly among trout > 18 cm long, but small fibres (< 20 μm) persisted in diminishing numbers even in the largest trout. In the 12 °C ad lib. trout, condition (K) correlated with length and fibre diameter; in the slower growing groups K was more influenced by mean fibre diameter. A higher asymptote of K occurred at greater length in the fastest growing group than in the two slower growing groups. Percent dry weight: length was greater for 16 °C ad lib. than for the fastest or slowest growth groups; absolute dry weight: length ratios were similar for 12 °C and 16 °C ad lib. trout; both exceeded those for the 12 °C 3-4% group.

Download Full-text

The effects of starvation upon protein turnover in red and white myotomal muscle of rainbow trout, Salmo gairdneri Richardson

Journal of Fish Biology ◽

10.1111/j.1095-8649.1984.tb04869.x ◽

1984 ◽

Vol 25 (2) ◽

pp. 223-230 ◽

Cited By ~ 88

Author(s):

P. T. Loughna ◽

G. Goldspink

Keyword(s):

Rainbow Trout ◽

Protein Turnover ◽

Salmo Gairdneri ◽

Myotomal Muscle

Download Full-text

Growth dynamics of mosaic muscle fibres in fingerling rainbow trout (Salmo gairdneri) in relation to somatic growth rate

Canadian Journal of Zoology ◽

10.1139/z80-212 ◽

1980 ◽

Vol 58 (9) ◽

pp. 1535-1541 ◽

Cited By ~ 44

Author(s):

A. H. Weatherley ◽

H. S. Gill ◽

S. C. Rogers

Keyword(s):

Growth Rate ◽

Rainbow Trout ◽

Fibre Diameter ◽

Fork Length ◽

Salmo Gairdneri ◽

Muscle Fibres ◽

Experimental Conditions ◽

Cross Sectional ◽

Rate Condition ◽

Epaxial Muscle

We examined the effects of varying water temperature (5, 12, 20 °C), ration size (ad libitum, and 3–4% of dry body weight per day), and injection of bovine growth hormone, on the growth characteristics of the epaxial muscle in laboratory-reared rainbow trout. Although the experimental conditions resulted in differences in growth rate, condition factor (K = W/L3 × 102) and dry weight, we found that, below a fork length of 18–20 cm, an increase in the cross-sectional area of the epaxial muscle occurs mainly by the addition of new fibres. However, between 20 and 25 cm the increase evidently results mainly from an increase in diameter of existing fibres. The relationship between fibre diameter frequency and fork length is characterized, and the implications of this relationship in limiting growth of this species is discussed.

Download Full-text