||Effects of Food Density and Temperature on Feeding and Growth of Young Inland Silversides ('Menidia beryllina').
Letcher, B. H. ;
Bengtson, D. A. ;
||Rhode Island Univ., Kingston. Dept. of Zoology.;Environmental Research Lab., Narragansett, RI.
||EPA-R-814721; EPA/600/J-94/263 ; ERLN-X195
Fresh water fishes ;
Feeding habits ;
Body weight ;
Menidia beryllina ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Food consumption and growth rates of 7 to 28-day-old Menidia beryllina were measured in response to natural ranges of temperature and prey availability. Feeding level, temperature and age all had significant effects on growth rate, although the effect of feeding level explained most of the variance. Feeding level also had a significant effect on gross growth efficiency, but temperature and age did not. Absolute growth rates (mg per day) increased dramatically with temperature, feeding level, and age. Variability in growth was greatest for fish feeding at the lowest feeding level. For a given fish weight, temperature had a positive effect on consumption rate, and maximum consumption (C(sub max)) of any treatment combination reached 75% body weight per day. Maximum growth rate was estimated at 24.6% body weight per day, and gross growth efficiency reached an estimated maximum of 0.375 at an ingestion rate of 25% body weight per day. Starved larvae lost on average 5.4% body weight per day and larvae required 6.4% body weight food consumption per day for maintenance. Multiple regressions of feeding level, temperature, and age/size on instantaneous growth rates indicated that increases in temperature increased maintenance requirements and required that fish consume a greater proportion of C(sub max) to attain maximum growth. Growth rates decreased with increases in temperature for fish eating a specific weight of food. (Copyright (c) 1993 The Fisheries Society of the British Isles.)
||Pub. in Jnl. of Fish Biology 43, p671-689 1993. Sponsored by Environmental Research Lab., Narragansett, RI.
|NTIS Title Notes
||Reprint: Effects of Food Density and Temperature on Feeding and Growth of Young Inland Silversides ('Menidia beryllina').
||PC A03/MF A01