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 AS  Vol.9 No.8 , August 2018
The Effects of Rearing Temperature on American Glass Eels
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&degC, 18&degC, 22&degC, or 26&degC to determine optimal juvenile rearing temperature in the laboratory. All treatments exhibited weight gain over the course of the study except the 14&degC treatment; however, there were only marginal differences in final weight between the 18&degC and 14&degC 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&degC and the 22&degC and 26&degC treatments and between 18&degC and 26&degC. Mortality was significantly greater than expected by chance at 26&deg(7 deaths) and no mortality was observed at 14&degC. Body condition (based on the residuals from the weight-length relationships), conversely, was lowest in the 14&degC treatment. Considering all response variables, optimal laboratory rearing conditions were observed between 18&degC - 22&degC. Within a week of experimentation, evidence of gas bubble disease was observed and by completion noted in all treatments except at 14&degC, 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.
Cite this paper: Blakeslee, C. , Galbraith, H. and Deems, R. (2018) The Effects of Rearing Temperature on American Glass Eels. Agricultural Sciences, 9, 1070-1084. doi: 10.4236/as.2018.98074.
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