John Wiley & Sons, Ltd.

The evaluation of three diets for rearing Hyalella azteca and the influence of diet on acute ammonia toxicity

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Three Hyalella azteca cultures were reared on different diets since birth, reflecting the recommended diets of various investigators. The three diets consisted of fish flakes (FF), a mixture of fish flakes supplemented with the diatom Thalassiosira weissflogii (FF‐D), and a mixture of fish flakes supplemented with yeast, cereal grass media and trout chow (FF‐YCT). The three diets were evaluated by comparing twenty weeks of culturing data, along with the organism's response to standard 96‐hour toxicity testing with ammonium chloride over a range of pH and temperature. H. azteca fed the FF‐D diet had the highest overall survival rate (96.6%, standard deviation (SD) 4.3%) compared to those fed the FF diet (92.0%, SD 12.7%) or the FF‐YCT diet (91.1%, SD 14.8%), although difference in survival was not statistically significant. Organisms fed the FF‐D diet produced a higher number of young per week per adult (6.1, SD 2.8) than the FF diet (5.1, SD 2.2) or the FF‐YCT diet (4.0, SD 1.2), although differences were not statistically significant. Of the diets evaluated, H. azteca reared on the FF‐D diet were often significantly more resistant to total and unionized ammonia toxicity in acute 96‐hour testing than those reared on the other two diets across the two temperatures and five pHs tested, suggesting this may be the most optimal diet for this species. This article is protected by copyright. All rights reserved

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