Peck, Myron A., Lawrence J. Buckley, Elaine M. Calderone and David A. Bengtson. ʺEffects of Food Consumption and Temperature on Growth Rate and Biochemical-Based Indicators of Growth in Early Juvenile Atlantic Cod Gadus morhua and Haddock Melanogrammus aeglefinus.ʺ Marine Ecology Progress Series. 251:233-243. 2003.
Effects of Food Consumption and Temperature on Growth Rate and Biochemical-Based Indicators of Growth in Early Juvenile Atlantic Cod Gadus Morhua and Haddock Melanogrammus AeglefinusFisheries, Animal and Veterinary Sciences Faculty Publications
Date of Original Version4-11-2003
AbstractThe relationship between the somatic growth rate (G) and feeding level (unfed, intermediate, and maximum rations) of age-0 juvenile cod Gadus morhua and haddock Melanogrammus aeglefinus was quantified at different temperatures. Laboratory trials were conducted using 2 sizeclasses of cod (3.6 to 5.6 cm standard length [SL], and 8.1 to 12.4 cm SL) at 5, 8, 12, and 15°C, and 1 size-class of haddock (6.0 to 9.6 cm SL) at 8 and 12°C. The shape of the growth-feeding relationship was well described by a 3-parameter asymptotic function for cod and by a linear function for haddock (R2 range = 0.837 to 0.966). The growth rate and scope for growth were maximum at 12°C, whereas growth efficiency was greatest (26.0 to 32.2%) at temperatures between 5 and 8°C. Juvenile cod held at 15°C exhibited reduced rates and efficiencies of somatic growth compared to fish at other temperatures. Biochemical-based growth indicators for age-0 juveniles were calibrated from measurements of the amounts of RNA, DNA, and protein in white muscle samples. A multiple linear regression using RNA:DNA and temperature as independent variables explained a significant portion of the variability observed in G of juvenile cod (R2 = 0.716) and haddock (R2 = 0.637). This relationship may be useful in estimating recent growth of age-0 juvenile cod and haddock in the field.