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Fish display a wide range of developmental ontogenies. These distinctions have taxonomic, evolutionary, and ecological importance in addition to practical implications on the use of fish in aquatic toxicity tests. With respect to animal welfare, vertebrates are afforded protected or non-protected status in the European Union based upon whether they feed endogenously off the yolk or exogenously by...
Lack of knowledge of early and juvenile development often makes it difficult to decide when a fish becomes a juvenile or, for that matter, a definitive phenotype. According to the established life-history model, a fish develops naturally in a saltatory manner, its entire life consisting of a sequence of stabilized self-organizing steps, separated by distinct less stabilized thresholds. Changes are...
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