Signal Crayfish: Improving Culture Techniques and Diets in British Columbia
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چکیده
Signal Crayfish (Pacifastacus leniusculus) are thought to be a species of commercial production potential, however there are a number of culture techniques that need to be better refined before commercial production is viable in Canada. This project sought to establish culture techniques for the species, by assessing growth and survival of juveniles as well as the digestive capabilities of adult crayfish fed formulated diets containing sustainable feed ingredients. The sustainable ingredients chosen were soybean meal, a common feed substitute for fishmeal, and Duckweed (Spirodela polyrrhiza), an invasive freshwater plant species, in British Columbia. During this project, Signal Crayfish were successfully raised for an entire year with minimal mortalities. Each of the diets tested showed very good survival and similar levels of growth. Crayfish consumed higher proportions of the Duckweed diet despite a slightly lower digestibility which suggests that aquatic macrophytes may be important feed ingredients for increasing palatability and caloric intake. This work provided a key first step in the culture of Signal Crayfish in British Columbia, and has shown that it is possible to breed and rear Signal Crayfish in captivity.
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