Growth, Movement, Recapture Rate and Survival of Hatchery-Reared Lobsters (Homarus Gammarus (Linnaeus, 1758)) Released Into the Wild On the English East Coast

Addison, Julian T.; Lovewell, S.R J.; Bannister, R. Colin A.

doi:10.1163/156854094x00530

Cited by 63 publications

(32 citation statements)

References 3 publications

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“…The rest was recaptured within a radius of about 2 km around the release areas and were significantly larger without a significant size difference between the sexes. Equally, the mark-recapture studies of Bannister et al (1994) found that lobsters showed strong fidelity to their release sites. Furthermore, Karavanich and Atema (1998) and Karnofsky et al (1989) reported that adult released lobsters moved only a few kilometres within their habitat, using larger boulder areas for shelter and feeding, displaying normal mating, dominance and territorial behaviour.…”

Section: Age (Year)mentioning

confidence: 99%

“…This fishing ban would increase egg production and would further enhance lobster recruitment. For other European lobster populations, Bannister et al (1994) reported that lobsters in UK reached legal size (85 mm CL) 4-5 years after release and Uglem et al (2005) found that lobsters in Norway need 6 growing seasons to reach a legal size of 88 mm CL.…”

Section: Growth Conditions Of Hatchery-reared Lobstersmentioning

confidence: 99%

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A mark-recapture study of hatchery-reared juvenile European lobsters, Homarus gammarus, released at the rocky island of Helgoland (German Bight, North Sea) from 2000 to 2009

et al. 2011

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a b s t r a c tFrom 2000 to 2005 about 5400 one-year-old hatchery-reared lobsters (Homarus gammarus) were tagged and released at the rocky island of Helgoland, North Sea. To date, 1-8% of the different release cohorts were recaptured in the field and 8-19% of these lobsters were recaptured from the semi-open area of the outer harbour. The recaptured lobsters indicated good development and growth conditions. The smallest berried females caught were 83 mm carapace length and 4 years old. The proportion of cultured lobsters to all measured lobsters captured around the island was 3-8% in the years [2007][2008][2009]. The population size of two cohorts was assessed using the Lincoln-Peterson method and the estimated survival rate averaged 30% and 40%. Minimum landing size of cultured lobsters was reached after 4-7 years. Cultured lobsters showed strong fidelity to their release sites, and thus remained around the island of Helgoland. A basis has been laid to enhance this endangered lobster population by means of a large scale restocking programme.

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Section: Age (Year)mentioning

confidence: 99%

Section: Growth Conditions Of Hatchery-reared Lobstersmentioning

confidence: 99%

A mark-recapture study of hatchery-reared juvenile European lobsters, Homarus gammarus, released at the rocky island of Helgoland (German Bight, North Sea) from 2000 to 2009

et al. 2011

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“…Release of genetically homogeneous hatchery-raised individuals may reduce genetic variability in wild populations through inbreeding (Tringali and Bert 1998;Utter 1998). Hatchery animals may compete with and displace wild animals (Bannister et al 1994;Castro et al 2001). The potential for enhancement success may reduce or excuse management activities needed to reduce fishing effort or habitat degradation (Lichatowich 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Finally, increases in stock size due to hatchery successes may provoke a rise in fishing effort, and therefore greater pressure on the remaining wild individuals (Hilborn 1998;Bannister 2000). The controversy is fueled by the fact that most enhancement efforts, which date from at least a century ago, have not been studied in a quantitative manner (Bannister et al 1994;Heppell and Crowder 1998;Crowe et al 2002). Such study did not begin until the late 1980s (Leber 1999).…”

Section: Introductionmentioning

confidence: 99%

Assessing the potential for stock enhancement in the case of the Chesapeake Bay blue crab (Callinectes sapidus)

Davis¹,

Young-Williams²,

Hines³

et al. 2005

Can. J. Fish. Aquat. Sci.

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Abstract:In certain cases of severely depleted fishery stocks, combining stock enhancement with traditional management techniques may be a useful way of returning stocks to an exploitable size. The Chesapeake Bay stock of blue crabs (Callinectes sapidus) has declined over the past decade and appears to be recruitment-limited, making it an appropriate candidate for enhancement efforts. This study serves as a first step in determining whether large-scale enhancement of blue crab stocks is feasible. Four hatchery-raised cohorts of 4000 -10 000 (25 000 in total) juvenile (6-30 mm carapace width, 58-70 days old) crabs were released in upper Chesapeake Bay coves. Sixty days after release, these crabs constituted 22%-79% of all crabs in the hatchery-crab size range (corresponding to an enhancement level of 28%-366%). Crabs released earlier in the summer reached maturity at the age of 6 months, younger than their wild counterparts. Estimated survivorship to maturity was 16%-20% for early-released crabs and 5-15% for latereleased crabs. Late-released crabs, like wild crabs, had to overwinter before becoming mature. Our study suggests ways to improve success of hatchery-raised individuals that can be broadly applied across taxa. The results also contribute specifically to determining whether large-scale stock enhancement is possible in the case of the Chesapeake Bay blue crab.Résumé : Chez certains stocks fortement réduits, la combinaison de mesures d'amélioration des stocks et de méthodes de gestion courantes peut être utile pour rétablir les stock à une taille exploitable. Le stock de crabes bleus (Callinectes sapidus) de la baie de Chesapeake a décliné au cours de la dernière décennie et semble limité par des problèmes de recrutement; c'est donc un bon candidat pour les efforts d'amélioration des stocks. Notre étude constitue une première étape pour déterminer si une amélioration du stock de C. sapidus à grande échelle est possible. Quatre cohortes de 4 000 à 10 000 (total de 25 000) jeunes (largeur de carapace, 6-30 mm; âge, 58-70 jours) crabes de culture ont été relâchés dans les anses supérieures de la baie de Chesapeake. Soixante jours après l'ensemencement, ces crabes représentaient 22-79 % des tous les crabes des classes de taille des crabes de culture, ce qui correspond à un niveau d'amélioration de 28-366 %. Les crabes relâchés plus tôt au printemps atteignent la maturité à l'âge de 6 mois, donc plus rapidement que les crabes sauvages. La survie à la maturité est estimée à 16-20 % chez les crabes relâchés tôt et à 5-15 % chez les crabes relâchés tard. Les crabes relâchés tard, tout comme les crabes sauvages, doivent passer l'hiver avant d'atteindre la maturité. Notre étude suggère des méthodes pour augmenter le succès d'individus élevés en culture qui sont largement applicables à d'autres taxons. Nos résultats contribuent aussi de façon spécifique à évaluer si des améliorations de stock à grande échelle sont possibles chez le crabe bleu de la baie de Chesapeake.[Traduit par la Rédaction] Davis et al. 122

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“…Through the development of the magnetic binary-coded microtag, it is possible to tag lobster juveniles before release into the sea for recognition years later in commercial landings (Jefferts et al 1963;Wickins et al 1986). A series of releases of tagged juvenile lobsters have since been conducted in Europe (Latrouite and Lorec 1991;Bannister et al 1994;Agnalt et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Predation on hatchery-reared lobsters released in the wild

Meeren¹

2000

Can. J. Fish. Aquat. Sci.

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Predation on hatchery-reared lobsters (Homarus gammarus) in the wild was studied in order to identify predators in southwestern Norway on rocky and sandy substrates in winter and summer. Lobsters of 12-15 mm carapace length were tagged with magnetic microtags. About 51 000 juvenile lobsters were released on 10 occasions at three locations. Predator samplings were by trammel nets, eel traps, and videorecordings during the 24 h immediately following the releases. In summer, loss to predators occurred on both rocky and sandy substrates. The loss was lower in winter when lobsters were found as prey in predators caught on sand. The risk of fish predation was highest in the first hours after release, when the lobsters were out of shelter. The wrasses Labrus bergylta and Labrus mixtus were the major predators of lobsters, while Atlantic cod (Gadus morhua), shorthorn sculpin (Myoxocephalus scorpius), and crab (Cancer pagurus) were mainly winter predators. Winter predators were never as abundant as summer predators. To minimise predatory loss of reared and costly lobsters, they should be released onto rocky substratum in winter. Due to the damage to the predated lobsters, it was not possible to correlate survival against lobster size.Résumé : Nos études, menées dans le sud-ouest de la Norvège sur la prédation exercée dans le milieu naturel sur des homards d'élevage (Homarus gammarus), visaient à identifier les prédateurs sur des substrats rocheux et sableux, en hiver et en été. Des homards dont la longueur de carapace était de 12-15 mm ont été étiquetés avec des micromarques magnétiques. Environ 51 000 homards juvéniles ont été lâchés en dix occasions à trois endroits. Pour échantillonner les prédateurs, on a eu recours à des trémails, des pièges à anguille et des enregistrements vidéo pendant les 24 h qui suivaient immédiatement les lâchers. En été, la prédation se produisait à la fois sur les substrats rocheux et sur les substrats sableux. Elle était moins intense en hiver, les prédateurs ayant consommé des homards se retrouvant surtout sur le sable. Le risque de prédation par des poissons était au maximum dans les premières heures qui suivaient le lâcher, lorsque les homards étaient dépourvus d'abris. Les labres Labrus bergylta et Labrus mixtus étaient les principaux pré-dateurs des homards, tandis que la morue (Gadus morhua), le chaboisseau (Myoxocephalus scorpius) et le crabe (Cancer pagurus) étaient surtout des prédateurs d'hiver. Les prédateurs d'hiver n'ont jamais été aussi abondants que les prédateurs d'été. Pour minimiser les pertes par prédation des coûteux homards d'élevage, il faudrait les lâcher en hiver sur des substrats rocheux. Étant donné les dommages subis par les homards soumis à la prédation, il n'a pas été possible de corréler la survie à la taille des homards.[Traduit par la Rédaction] van der Meeren 1803

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Growth, Movement, Recapture Rate and Survival of Hatchery-Reared Lobsters (Homarus Gammarus (Linnaeus, 1758)) Released Into the Wild On the English East Coast

Cited by 63 publications

References 3 publications

A mark-recapture study of hatchery-reared juvenile European lobsters, Homarus gammarus, released at the rocky island of Helgoland (German Bight, North Sea) from 2000 to 2009

A mark-recapture study of hatchery-reared juvenile European lobsters, Homarus gammarus, released at the rocky island of Helgoland (German Bight, North Sea) from 2000 to 2009

Assessing the potential for stock enhancement in the case of the Chesapeake Bay blue crab (Callinectes sapidus)

Predation on hatchery-reared lobsters released in the wild

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