Satiation meal and the effects of meal and body sizes on gastric evacuation rate in brook trout Salvelinus fontinalis fed commercial pellets

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Khan U. K., Seyhan K., Bascinar N., Bascinar N. S.

JOURNAL OF FISH BIOLOGY, vol.89, no.2, pp.1227-1238, 2016 (SCI-Expanded, Scopus)

  • Publication Type: Article / Article
  • Volume: 89 Issue: 2
  • Publication Date: 2016
  • Doi Number: 10.1111/jfb.13021
  • Journal Name: JOURNAL OF FISH BIOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1227-1238
  • Keywords: feeding regimes, fish size, general power function, Salmonidae, square-root function, PLEURONECTES-PLATESSA L, COD GADUS-MORHUA, PISCIVOROUS BROWN TROUT, SCOPHTHALMUS-MAXIMUS L, ESTIMATE FOOD RATIONS, SQUARE-ROOT MODEL, STOMACH CONTENTS, PREDATORY GADOIDS, MERLANGIUS-MERLANGUS, MULTIPLE MEALS
  • Karadeniz Technical University Affiliated: Yes

Abstract

Gastric evacuation ( GE) experiments were performed on brook trout Salvelinus fontinalis fed commercial food pellets. The experiments included small fish ( 36 g; 15 cm total length, L-T) fed meals of 0.2, 0.4 and 0.8 g and large fish ( 152 g; 23 cm) fed meals of 0.8, 2.0 and 4.0 g at temperatures ranging from 15.1 to 18.2 degrees C. The stomach contents were thereafter sampled and weighed at 3 h intervals until the first empty stomach was observed. The course of GE was examined by use of a general power function of the data that revealed that the square-root function described the GE rate ( GER) by the current stomach content mass independently of original meal size. Using the square-root function, the relationship between GER and fish size was described by a power function of fish length, whereas the effect of temperature was described by a simple exponential function. GER of the commercial pellets fed to S. fontinalis could thus be described by dS(t)/dt = -0.000464L(1.31)e(0.052T) root S-t (g h(-1)), where S-t is stomach mass ( g) at time t ( h), L is total fish length ( cm) and T is temperature (degrees C). The result of this study should provide a useful tool for planning of feeding regimes in production of S. fontinalis by optimizing growth and minimizing food waste. (C) 2016 The Fisheries Society of the British Isles