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GENDRON, L., P. FRADETTE, 1995. Revue des interactions entre le crabe commun (Cancer irroratus) et le homard américain (Homarus americanus), dans le contexte du développement d'une pêche au crabe commun au Québec. Rapp. manus. can. sci. halieut. aquat., 2306, 47 p .
In the past few years, significant efforts have been made in the Quebec region to develop the exploitation of rock crab (Cancer irroratus). However, a number of fishermen have expressed concerns on the development of this new fishery because they fear that it could affect the lobster resource. The present document reviews the relationships between rock crabs and lobsters in order to better understand the linkage between these two species. The positive and negative impacts that the lobster resource could be subjected to following the exploitation of rock crab are discussed. Negative impacts could be expected only if the number of small crabs, i.e. those on which lobster feed, would be reduced to a level where they would become less available to the lobster. If the case arises, the growth and reproduction of lobster could be slower. Feeding on other prey may not compensate totally the absence of a high-quality prey such as rock crab. Moreover, it is possible that the predators feeding mainly on crustaceans, may increase their predation pressure on lobster. It is however not possible to determine the level of rock crab abundance under which this resource would become limiting and would cause the effects mentioned above. It is not possible neither to determine the level of parental stock abundance necessary to maintain sufficient production of small crabs. Rock crab and lobster interact sufficiently enough to justifiy a tight and cautions management of the rock crab resource, in order to prevent any negative impacts.
GENDRON, L., C. CYR, P. FRADETTE, 1994. Détermination du potentiel de pêche au homard (Homarus americanus) le long du versant nord de la péninsule gaspésienne. Rapp. tech. can. sci. halieut. aquat., 1980, 35 p .
Exploratory fishing took place during the summer of 1993 in the Gaspé-Nord region, between Capucins and Gros Morne, to determine if there were lobster concentrations large enough to sustain a commercial exploitation, and to determine the type of fishing that could be practiced. The exploratory fishing took place from July 5 to August 7, 1993. At first, fishing proceeded along predetermined transects. Then, fishermen were allowed to fish wherever they wished inside the designated zones. During the first phase of the exploratory fishing 8 lobsters were caught in a total of 1229 traps. During the second phase, 216 lobsters were caught for 3381 traps hauled. Most lobsters were caught in shallow water (3,6 to 10 m depth) inside zone 5 (Rivière-à-Claude to Gros Morne). Lobsters were large (95,0 and 97,7 mm CTL on average for females and males, respectively). In general, lobster biomass in this region is very low, growth is presumably slow and the reproductive potential low. The presence of a few small lobsters (60 mm CTL) suggests that there could be local recruitment of young lobsters. Local larval production however is probably exported. Therefore, the local stock is probably dependent on the production originating from other regions, either via larval transport or migration of individuals in the benthic stage. Our results suggest that lobster exploitation in this region would produce small yields and be of short duration if the recruitment is sporadic or slow. The establishement of conservation measures to protect the reproductive potential is questionable. First, the reproductive capability of the lobster population of Gaspé-Nord has not been demonstrated and second, such measures would not have any local impact. They would only benefit to populations that are dependent on the Gaspé-Nord population, which are unlikely to exist.
HUDON, C., P. FRADETTE, 1988. Planktonic growth of lobster (Homarus americanus) larvae off Îles-de-la-Madeleine (Quebec), Gulf of St. Lawrence. Can. J. Fish. Aquat. Sci., 45: 868-878 .
HUDON, C., P. FRADETTE, P. LEGENDRE, 1986. La répartition horizontale et verticale des larves de homard (Homarus americanus) autour des Îles-de-la-Madeleine, golfe du Saint-Laurent. Can. J. Fish. Aquat. Sci., 43: 2164-2176 .
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