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Maximum Daily Ration of Great Lakes Bloater
Author(s) -
Binkowski Fred P.,
Rudstam Lars G.
Publication year - 1994
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1994)123<0335:mdrogl>2.3.co;2
Subject(s) - zoology , fish <actinopterygii> , body weight , biology , brine shrimp , shrimp , dry weight , fishery , botany , endocrinology
Maximum daily consumption rates of bloater Coregonus hoyi from Lake Michigan were measured in the laboratory for 1‐, 5‐, 10‐, 25‐, 50‐, 100‐, and 200‐g fish at 4, 8, 12, and 16°C. These represent most of the ranges in bloater size and temperature likely to be encountered in Lake Michigan. Bloaters were raised from eggs in the laboratory and acclimated to test temperatures for 22–23 d prior to the experiments. Maximum daily consumption rates were determined by feeding the fish surplus amounts of brine shrimp Artemia sp. at4‐h intervals for 24 h. Specific daily ration increased with temperature up to 16°C for all size‐groups. At 12 and 16°C, the maximum daily ration of small bloaters (about 1 g) exceeded 120% of body weight per day (based on wet weight; equivalent to 79%/d based on dry weight); the maximum daily ration of large bloaters (over 100 g) ranged between 5 and 12%/d (2–7%/d based on dry weight). As percentage of maximum consumption at 16°C, consumption rates averaged 82% at 12°C, 45% at 8°C, and 28% at 4°C. These results can be described by the equation: C max = 1.61· W –0.538 · F ( T ), where C max is specific maximum consumption rate (g·g –1 ·d –1 ), W is fish weight (g), and F ( T ) is a dome‐shaped temperature dependence function with an optimum temperature of 16.8°C ( R 2 = 0.957, N = 27).