MAXIMUM DAILY RATION OF GREAT-LAKES BLOATER

Authored by FP Binkowski, LG Rudstam

Date Published: 1994

DOI: 10.1577/1548-8659(1994)123<0335:mdrogl>2.3.co;2

Sponsors: United States National Oceanic and Atmospheric Administration (NOAA) National Sea Grant College Program United States Department of Commerce (DOC)

Platforms: No platforms listed

Model Documentation: Other Narrative

Model Code URLs: Model code not found

Abstract

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-degrees-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. at 4-h intervals for 24 h. Specific daily ration increased with temperature up to 16-degrees-C for all size-groups. At 12 and 16-degrees-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-degrees-C, consumption rates averaged 82\% at 12-degrees-C, 45\% at 8-degrees-C, and 28\% at 4-degrees-C. These results can be described by the equation: C(max) = 1.61 . W-0.138. 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-degrees-C (R2 = 0.957, N = 27).

Tags

Individual-based model Growth-rate Brown trout Stizostedion-vitreum-vitreum Yellow perch Perch perca-flavescens Salmo-trutta l Coregonus-lavaretus l Thermal habitat Temperature tolerance