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The effect of temperature, salinity, eyestalk ablation, and limb removal on growth and survival of juvenile paddle crab, Ovalipes trimaculatus (Brachyura: Portunidae)

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Crustacean growth in nature is affected by hormonal processes and natural stressors. For aquaculture purposes, paddle crab, Ovalipes trimaculatus (De Haan, 1833), juveniles were subjected to experimental eyestalk ablation, limb removal, and a combination 3 × 3 temperature and salinity conditions. Relative lifetime in captivity (RLC), molting success (MS), molting interval (MI), growth in terms of size and weight after molting (SI and WI), specific growth rate in size (SGRs) and weight (SGRw), and hepatosomatic index (HS) were evaluated in eight replicate groups of crabs for each treatment (one crab per tank). RLC was significantly lower in eyestalk-ablated crabs than in those subjected to limb removal and to control conditions (no organ removal, 13 °C, salinity of 33); it was significantly higher in crabs held at a salinity of 30 vs those maintained at 33 and 27. Combinations of 16 or 19 °C and salinity of 30 provided the optimal conditions of growth in size and weight. Results suggest that control of temperature and salinity can improve growth and survival of juveniles in captivity. However, organ removal did not promote molting in captivity, likely to the detriment of survival and physiological condition. Findings from the present study highlight the importance of carefully selecting conditions to rear this valuable commercial crab to promote its aquaculture in the region.
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Document Type: Research Article

Affiliations: 1: Centro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Laboratorio de Oceanografía Biológica (LOBio), Puerto Madryn, Chubut, Argentina; ar, Email: [email protected] 2: Centro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Laboratorio de Oceanografía Biológica (LOBio), Puerto Madryn, Chubut, Argentina, Universidad Tecnológica Nacional – Facultad Regional Chubut (UTN-FRCh), Puerto Madryn, Chubut, Argentina. (Affiliation at the time of experimental work) 3: Centro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Laboratorio de Oceanografía Biológica (LOBio), Puerto Madryn, Chubut, Argentina, Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB), Sede Puerto Madryn, Chubut, Argentina 4: Centro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Laboratorio de Oceanografía Biológica (LOBio), Puerto Madryn, Chubut, Argentina, Universidad Tecnológica Nacional – Facultad Regional Chubut (UTN-FRCh), Puerto Madryn, Chubut, Argentina. (Affiliation at the time of experimental work), Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB), Sede Puerto Madryn, Chubut, Argentina

Publication date: 01 January 2019

This article was made available online on 29 August 2018 as a Fast Track article with title: "The effect of temperature, salinity, eyestalk ablation, and limb removal on growth and survival of juvenile paddle crab, Ovalipes trimaculatus (Brachyura: Portunidae)".

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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