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Parameterizing an expanded square root model to account for the effects of temperature, meal size, and body size on gastric evacuation rate in farmed brown trout
Author(s) -
Dürrani Ömerhan,
Seyhan Kadir
Publication year - 2021
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.15318
Subject(s) - brown trout , biology , salmo , aquaculture , zoology , trout , meal , fish meal , dried fish , fishery , fish <actinopterygii> , pellets , food science , paleontology
Gastric evacuation rate (GER) modelling is a promising tool for planning feeding regimes to optimize farmed fish growth and minimize feed waste. This study examined the influences of the predictor variables viz . temperature, meal size, and body size on GER of farmed brown trout ( Salmo trutta L.) fed commercial pellets in GER experiments. The experiments included large fish of 29.3 ± 0.3 cm (mean ± SE, total length) and 280.8 ± 7.8 g (wet weight) fed meals of 2 g and 6 gas well as small fish of 15.1 ± 0.1 cm and 33.9 ± 0.7 g fed meals of 0.3 and 0.8 g. The water temperature ranged from 13.0 to 19.2°C. The square root model best described GER independently of meal size. The influence on GER of the two other predictor variables was then quantified using a simple power function for body size and an exponential for temperature. The statistical analyses provided the relationshipsd S td t = ‐ 0.00245 W 0.41 e 0.06 TS t(g/h) andd S td t = ‐ 0.00037 L 1.22 e 0.06 TS t(g/h), where S t is the current stomach content mass (g), W the body mass (g), L the total body length (cm), T the temperature (°C), and t the time (h). These findings should enhance the effectiveness and efficiency of feeding strategies to optimize growth, minimize expensive feed wastes, and reduce environmental pollution caused by aquaculture.