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Animal by-product meals (ABM) were substituted for fisb meal in five experimental diets for Nile tilapia fry, Oreochromis niioticus (L), witb 25%, 50%, 75% and 100% substitution. Two diets witb 100% ABM were tested, one witb 50:50 animal lipid:soybean oil, and tbe otber witb 100% fisb oil as attractant. In general, tbe best growtb and feeding performance was obtained witb a control diet based on fisb meal as tbe sole protein, but tbe results were not statistically different from tbose obtained witb 75% and 100% ABM witb soybean oil, A simple cost analysis suggested better economic efficiency wben tilapia were fed witb 100% ABM, It was concluded tbat animal by-product meal can be used as a sole protein source in commercial diets for Nile tilapia fry, witbout affecting growtb and food utilization of tbe fisb, improving tbe economics of feeding in comparison witb fisb meal.

Procambarus (Austrocambarus) llamasi (Villalobos 1955) is a crayfish endemic to south‐eastern Mexico with aquaculture potential. This study intends to enhance knowledge of the reproductive biology of this species under laboratory conditions, including fecundity, egg development and juvenile growth. Mean fecundity was 311 eggs/female, and egg development occurred in seven stages over a 27‐ to 30‐day time range. The best growth results were obtained at a density of 50 organisms m−2.Procambarus llamasi is considered to perform well in aquaculture contexts.

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