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The effects of rearing temperature on American glass eels

Agricultural Sciences

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https://doi.org/10.4236/as.2018.98074

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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