Holding wild Snow crab, Chionoecetes opilio : effects of stocking density and feeding on survival and injury

Abstract

In this study the effects of different stocking densities on survival, injury and weight of captive male snow crab were examined. The first experiment (I) was carried out in square plastic tanks (700 L) with stocking densities of 100 (L), 150 (M) and 200 kg m À3 (H) for 30 days. In a second experiment (II) snow crabs were kept at a stocking density of 50 kg m À3 and were either fed (F) or not fed (S) for the same period of 35 days. The last experiment (III), was carried out with stocking densities of 25 kg m À3 for 21 days with two groups, one with inactivated claw and one without rubber bands, with three replicates per treatment. In the first experiment mortality (H = 27, M = 26 and L = 36%) and occurrence of injuries (H = 27, M = 20 and L = 16%) were high in all groups. The weight loss during the experimental period was; H = 15.3, M = 10.9 and L = 15.5 g, and was not significant different between the groups. In experiment II the mortality (F = 13% and S = 14%) and injuries were lower (F = 12% and S = 17%). The average weight increased in the fed treatment and decreased in the starved treatments. In the last experiment there was no mortality in any of the groups and the levels of injury were low (5% and 7%). The results show that adult male snow crab cannot be stored at densities equal to or higher than 25 kg m À3 for 3 weeks without risk of mortality.

Current Status of the Red King Crab (Paralithodes camtchaticus) and Snow Crab (Chionoecetes opilio) Industries in Norway

“…The development of live-storage technology requires a reliable, consistent supply of crabs. It is through live storage that crabs can be transported to overseas markets in good condition (Siikavuopio and James, 2015;Siikavuopio et al, 2017). Capture-based aquaculture of RKC and SC is developing in Norway, and some efforts have been made to establish small-and mediumsized enterprises using intensive aquaculture systems for live storage of RKCs (James et al, 2013;Siikavuopio and James 2015;Siikavuopio et al, 2017).…”

“…In 1996, SC was first observed in the Barents Sea (Kuzmin et al, 1999), but the scientific community is not certain how long they have been in, nor how they reached, the Barents Sea (Kuzmin et al, 1999;Hansen, 2016). Commercial harvesting of SC in the Barents Sea only started in the last few years, but it is growing rapidly (Lorentzen et al, 2016a;Siikavuopio et al, 2017), and now appears to be permanently established. In 2016, export of frozen clusters of SC from Norway amounted to 3952 metric tons, corresponding to a value of 331 million Norwegian Kroner (NOK; www.seafood.no).…”

Development of technology for gourmet smoked products from cod species using enzyme preparation from hepatopancreas of snow crab Chionoecetes opilio

“…С учетом этого, расширение ассортимента безопасной рыбной продукции массового потреб-ления с улучшенными органолептическими свойствами на основе использования нетради-ционных для копчения видов рыбного сырья, а также применения ферментного препарата из гепатопанкреаса краба-стригуна Chionoecetes opilio для улучшения консистенции готовой продукции [4], представляет собой актуальную цель проведенного исследования.…”

“…На рисунке 2 пред-ставлена технологическая схема получения ФП из гепатопанкреаса краба-стригуна. Присутствие протеолитической активности в ФП из гепатопанкреаса краба-стригуна было зафиксировано в той или иной степени при всех значениях рН [15], что не противоречит литературным данным в отношении ФП из гепатопанкреаса камчатского краба [16].…”

“…Разработанная технология деликатесного подкопченного рыбного филе тресковых рыб включает в себя основные стадии технологии подкопченной рыбы (рисунок 3, сплошная ли-ния) [4] и новые операции, связанные с использо-ванием ФП из гепатопанкреаса краба-стригуна Chionoecetes opilio (рисунок 3, пунктирная ли-ния).…”