Technological scheme and biotechnical indices of industrial cultivation of red king crab juveniles in aquaculture

A technological scheme for growing red king crab juveniles in a modular basin complex was developed. Seven stages were included: “Catch and delivery of females with eggs” (1); “The content of females with eggs” (2); “The content of females in the period of larvae separation “ (3); “Growing of larvae” (4); “Growing postlatvae (glaucotoea) ” (5); “Growing juveniles” (6); “Release of juveniles in the natural environment” (7). The success of stages 1 and 2 depends on the physiological state of the females. The duration of stage 2 is determined by the stage of maturity of the eggs. In stage 3, a point light source located in the container compartment separated from the females by a perforated septum should be used to quickly harvest newly emerged larvae from eggs. Stage 4 is the most labor-intensive. In this phase of the red king crab life cycle, cannibalism appears, leading to an increase in mortality of larvae with a lack of food. At the stage 5 there is a transition of individuals from the plankton to the bottom way of life. In this regard, in the culture vessel, it is necessary to establish substrates for the settling of postlarvae (glaucotoea). Glaucotoea does not feed, at this stage of development of the red king crab feeding is not carried out. At stage 6, juveniles lead a bottom lifestyle. At this stage, it is necessary to perform a gradual replacement of the nets for settling glaucotoea on bottom substrates. The red king crab juveniles begin to feed, and for its feeding they use mixed fodders, and, to a lesser extent, nauplii of Artemia sp. At the final stage 7, it is necessary to prepare the juveniles for transportation and releasing into the natural environment in pre-selected locations. Application of the proposed biotechnical methods and approaches to the production and cultivation of the red king crab juveniles will allow to optimize the cultivation of the species, as well as taxonomically and ecologically related representatives of crabs.

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