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Five biochemically based variables (RNA, DNA, protein content, RNA:DNA [R:D] ratio, protein:DNA [pro:DNA] ratio) were evaluated as potential indirect measures of growth in larval haddock Melanogrammus aeglefinus. Larvae were reared in the laboratory from hatch to 47 d post-hatch under temperature (T)-controlled conditions (6, 8, and 10°C) and, to produce a variety of growth rates, were starved or reared at 1 of 3 prey levels. The nucleic acid content of the larvae was measured with a spectrofluorometric microplate assay, and the protein-specific growth rate (SGR,% d -1 ) was estimated from the difference in mean protein content between consecutive sampling intervals. Larval haddock growth rate was best described by R:D or pro:DNA ratios. The growth models developed were: SGR=4.61R:D+ 1.18T- 17.31 (R 2 = 0.52) and SGR = 0.92 pro:DNA + 1.10T- 24.97 (R 2 = 0.52). These models can be used to estimate recent growth of larval haddock collected from both the laboratory and field. A combined haddock/Atlantic cod Gadus morhua growth model was calculated as: SGR = 4.67R:D + 0.96T- 15.30 (R 2 = 0.45). This model will be used to estimate recent growth of haddock and cod larvae collected during a multi-year field sampling effort on Georges Bank.

Estimating growth in haddock larvae Melanogrammus aeglefinus from RNA:DNA ratios and water temperature