Food consumption and absorption efficiency by newly settled summer flounder, Paralichthys dentatus (Linneaus, 1766)
Date of Original Version
As part of a project to determine the energetic basis of growth rate variation, 24-h experiments were conducted to investigate differences in rates of food consumption and absorption efficiency, between and within cohorts (defined here as offspring from a single set of parents) of newly settled laboratory-reared summer flounder, Paralichthys dentatus (Linneaus, 1766). Food consumption, absorption efficiency and growth were measured for fish which had been fast-growing and slow-growing larvae (referred to as grade 1 and grade 3 fish, respectively) from each of five sets of parents (referred to as cohorts 1, 2, 3, 4 and 5) at constant temperature (20 ± 1 °C), salinity (30 ± 2‰) and light regime (16L:8D), at fish sizes of 15, 20, 25 and 30 mm total length (range: 2.9-59.0 mg dry weight). Significant differences in the rates of consumption of brine shrimp (Artemia sp.) nauplii, on both a per-fish basis (447-5105 nauplii (day)- 1) and a weight-specific basis (12-49% body weight (day)- 1), absorption efficiency (46-96% of the consumed ration), and specific growth rate (1.08-10.79% body weight (day)- 1) existed among fish at each size. Significant differences were also found in food consumption between grade 1 and grade 3 fish within a cohort, although not at all fish sizes. There was no overall effect of cohort on food consumption (p = 0.083); however, significant differences in absorption efficiency among cohorts existed (p = 0.000). As expected, this study suggests that differences in the rates of food consumption directly influence growth rate variation in this species. © 2006 Elsevier B.V. All rights reserved.
Publication Title, e.g., Journal
Getchis, T. S., and D. A. Bengtson. "Food consumption and absorption efficiency by newly settled summer flounder, Paralichthys dentatus (Linneaus, 1766)." Aquaculture 257, 1-4 (2006). doi: 10.1016/j.aquaculture.2006.02.063.