An RNA:DNA-based growth model for young-of-the-year winter flounder Pseudopleuronectes americanus (Walbaum)
A laboratory calibration experiment was conducted to determine the relationship between nucleic acid-based variables and growth rate in young-of-the-year winter flounder Pseudopleuronectes americanus. Three temperatures and three feeding levels were used to produce a variety of growth rates. Nucleic acid analyses were conducted on white muscle tissue using an ultraviolet absorption assay. RNA concentration (g mg−1 wet tissue mass) and the ratio of RNA:DNA (RRD) were positively correlated with a mass-based instantaneous growth coefficient (GM) (r = 0·42 and 0·72, respectively). Fifty-one per cent of the variability in growth rate was explained by the simple linear regression GM=−0·02615 + 0·00848RRD (P < 0·001). This model can be used to estimate recent growth rates for early juvenile winter flounder (27–52 mm standard length) at temperatures ranging from 11 to 24° C.
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Document Type: Regular Paper
Publication date: 01 April 2008