Doryteuthis gahi, Patagonian long-finned squid

摘要: Doryteuthis gahi (Orbigny, 1835) is a relatively small squid typically attaining 13–17 cm mantle length that inhabits the shelves around southern tip of South America from Peru in Pacific to Argentina and Falkland Islands Atlantic. It most abundant Islands, where it subject important commercial fishery with total annual catch 50,000 t. Among Loliginidae, D. coldest water species associated mixed waters temperate Sub-Antarctic origin. The spawns at temperatures between 4 11°C, embryogenesis taking 1.5 months spring-summer 4.5 winter. Population structure consists two cohorts differ by spawning season (autumn-spawning spring-spawning squid), extent offshore migrations fecundity. Both have life cycle, high growth rates best described Shnute function. Main prey are planktonic crustaceans; euphausiids pelagic amphipod Themisto guadichaudii. Large animals also cannibalize on smaller squid. an for nektonic fishes, sea birds mammals inhabiting Patagonian Shelf.