The effects of rearing temperature on American glass eels

Agricultural Sciences
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Abstract

American eels are declining throughout their range requiring a better understanding of physiological requirements of all life stages and optimal conditions for laboratory rearing and aquaculture. American glass eels (Anguilla rostrata) were housed for 3 weeks at 14˚C, 18˚C, 22˚C, or 26˚C to determine optimal juvenile rearing temperature in the laboratory. All treatments exhibited weight gain over the course of the study except the 14˚C treatment; however, there were only marginal differences in final weight between the 18˚C and 14˚C treatments and no differences in length. Variation in length and weight generally increased as temperature increased with significant differences in the standard error of weight between 14˚C and the 22˚C and 26˚C treatments and between 18˚C and 26˚C. Mortality was significantly greater than expected by chance at 26˚C (7 deaths) and no mortality was observed at 14˚C. Body condition (based on the residuals from the weight-length relationships), conversely, was lowest in the 14˚C treatment. Considering all response variables, optimal laboratory rearing conditions were observed between 18˚C - 22˚C. Within a week of experimentation, evidence of gas bubble disease was observed and by completion noted in all treatments except at 14˚C, likely as a function of decreased gas solubility at warmer temperatures. Levels of total gas pressure (103% - 108%) and Δp (28 - 54 mm Hg) values may account for the gas bubbles observed.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title The effects of rearing temperature on American glass eels
Series title Agricultural Sciences
DOI 10.4236/as.2018.98074
Volume 9
Issue 8
Year Published 2018
Language English
Publisher SCIRP
Contributing office(s) Leetown Science Center
Description Article ID:87049; 15 p.
First page 1070
Last page 1084