Abstract
Twelve females of the Patagonian red octopus Enteroctopus megalocyathus, of 1.4 ± 0.2 kg, were maintained at 12 ºC under three conditioning treatments: T1 (F10%), frozen fish at 10% daily body weight (bwt d–1); T2 (FC (3:1) 10%), mix (3:1) of frozen fish and fresh crab at 10% bwt d–1; and T3 (F7.5%), frozen fish at 7.5% bwt d–1. Egg laying was observed after four months of conditioning, when from 545 to 1100 ºC days had been reached, and when females had increased 1.5 times in body weight. Absolute fecundity reached 2129 eggs (±1182) per female in treatments T1 and T2, whereas in T3 fecundity reached only 56 eggs. The lowest values of perivitelline protein were obtained in T1 and T2, while total lipid content in the yolk was similar among treatments. The most frequent fatty acids in egg yolk were 16:0, 17:0, 17:1, 18:0, 20:1, 20:4n-6, 23:0, 20:5n-3, 22:5n-3, and 22:6n-3. Significant differences in fatty acid contents among treatments were observed only for 16:1 and 22:5n-3. The results showed that females can be conditioned for egg production even when fed a diet lacking crustaceans, and that a dietary reduction of 7.5% bwt d–1 diminished fecundity without affecting egg quality in terms of their biochemical composition.
Highlights
The Patagonian or southern red octopus Enteroctopus megalocyathus (Gould 1852) and the octopus Octopus mimus are the two most important commercial octopus species in Chile, with annual landings fluctuating between 2000 and 5000 t (Pérez et al 2006)
The results showed that females can be conditioned for egg production even when fed a diet lacking crustaceans, and that a dietary reduction of 7.5% bwt d–1 diminished fecundity without affecting egg quality in terms of their biochemical composition
In T1 and T2, an average of 2129 ± 1182 eggs per female was obtained, whereas in T3, only two females spawned and fecundity was less than 100 eggs per female
Summary
The Patagonian or southern red octopus Enteroctopus megalocyathus (Gould 1852) and the octopus Octopus mimus are the two most important commercial octopus species in Chile, with annual landings fluctuating between 2000 and 5000 t (Pérez et al 2006). The Patagonian red octopus is distributed only along the southernmost coasts of South America. As a result of its significant commercial exploitation in southern Chile, the fisheries authority decreed a prolonged closed season of three years for this resource, INTRODUCCIÓN. El pulpo del sur o pulpo rojo patagónico Enteroctopus megalocyathus (Gould 1852) y el pulpo Octopus mimus son las dos especies de pulpo de mayor importancia comercial en Chile, con capturas entre 2000 y 5000 t año–1 (Pérez et al 2006).
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