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PELLETIER, L., 2003. Scallops in Quebec inshore waters in 2002. Science, Stock Status Report, 2003/015, 16 p .
PELLETIER, L., 2003. Petoncles des eaux cotieres du Quebec en 2002. Rapport sur l'état des stocks, 2003/015, 17 p .
PELLETIER, L., 2003. L'oursin vert du Québec : une ressource à découvrir. Naturaliste can., 125(1): 73-74 .
PELLETIER, L., P. GAUTHIER, 2002. Inventaire de l'oursin vert (Strongylocentrotus droebachiensis) au Bas-Saint-Laurent à l'aide d'une caméra vidéo sous-marine. Rapp. tech. can. sci. halieut. aquat., 2394, 30 p .
This report presents results from an underwater video inventory of the distribution, abundance and size structure of the green sea urchins (Strongylocentrotus droebachiensis) in the Lower St. Lawrence during the summer of 2000. A total of 28 video transects of depths varying between 0 and 10 m were conducted between Cacouna and Rimouski. The sizes and densities of green sea urchins were measured from 795 pictures of 0.25 m2 quadrats extracted from the video tapes. Green sea urchins were present everywhere in the study area and on all types of substrates including sandy bottoms, which dominate the zone. The distribution of the sea urchins was heterogeneous: depending on transects, average densities varied between 0.1 and 44.4 urchins/m2. Important variations in densities were also observed between quadrats of a same transect. The highest concentrations of sea urchins were found close to the extremity of Île Verte (44 and 32 urchins/m2) and near Trois-Pistoles (39 urchins/m2). The density of sea urchins of commercial size (≥ 50 mm) was generally low (< 5 urchins/m2), and the highest concentrations were measured at or close to actual or prospective aquaculture sites. The underwater video camera proves to be an adequate tool for the study of green sea urchins in the Lower St. Lawrence, allowing the survey of a large zone in an economic and safe manner.
PELLETIER, L., 2002. Scallops in Quebec inshore waters. Science, Stock Status Report, C4-07, 14 p .
PELLETIER, L., 2002. Pétoncles des eaux côtières du Québec. Rapport sur l'état des stocks, C4-07, 15 p .
PELLETIER, L., P. GAUTHIER, M. NADEAU, 2001. L'oursin vert (Strongylocentrotus droebachiensis) des Îles-de-la-Madeleine : description des agrégations et potentiel d'exploitation. Rapp. tech. can. sci. halieut. aquat., 2362, 28 p .
This report presents a first description of the green sea urchin aggregations in Île-de-la-Madeleine and the evaluation of their potential for exploitation, based on a diving survey conducted in September 1999. Eight sites previously visited by fishermen and characterized by hard bottoms were examined. Three main sites were sampled near the Les Demoiselles hills, Gros Cap and Shag island. Sea urchin densities varied from 0 to 83.3 urchins/m2 without an apparent relationship to macroalgae abundance or depth, but possibly related to the bottom type. Test diameter varied from 6 to 66 mm and only 9ppt of the sea urchins had reached the legal size of 50 mm. The relationship between weight and test diameter were compared with those described by other Canadian studies. Indices of density are given for each site as well as a first estimate of the total fishable biomass (5123 t) for all eight sites. In September 1999, the gonads of the sea urchins were poorly developed and their weights were less than 10ppt of the total weight of the animal. The sex ratio was estimated at 1.0 males : 1.1 females. Ages of the sea urchins were determined with the method based on the counts of the growth lines on the rotules of Aristotle's lantern. The results obtained by this method indicate that the age of the sea urchins at 50 mm varied between 4 and 20 years (average 9 years). The life span is estimated at 19-20 years. This index of longevity is incorporated into the calculation of the potential for exploitation estimated at 235 t for the visited areas.
PELLETIER, L., H. BOURDAGES, S. BRULOTTE, 2001. Estimation de la perte de poids subie par l'oursin vert (Strongylocentrotus droebachiensis) suivant sa sortie de l'eau et comparaison de deux techniques de mesure du diamètre du test. Rapp. can. ind. sci. halieut. aquat., 264, 14 p .
An evaluation of the weight loss by green sea urchins during storage was carried out in response to requests by the working group on green sea urchins and the urchin fishing industry of Quebec. A laboratory experiment using sea urchins from our wetlab facilities allowed us to evaluate the weight loss over six days following the removal of sea urchins from the water and subsequent cold-room storage at 4 degreeC. The weight loss varied in relation to the storage period and the initial weight. The daily average weight losses, expressed as percentages of the initial weight, were rather stable over the experiment (from 0 to 144 hours). For sea urchins of commercial size (test diameter greater than or equal 50 mm), the weight losses after 24, 48, 72, and 144 hours of storage were estimated to be approximately 2, 5, 7, and 14 % of the initial weight of the urchin when it was removed from the water. Feeding of sea urchins prior to removal had no effect on the observed weight loss. In addition, two techniques for measuring the test diameter using a vernier caliper was compared. A fast measurement gave results comparable to those obtained when special care was taken to the exact positioning of the calipers on the opposite ambulacral and interambulacral plates.
PELLETIER, L., 2000. L'oursin vert des eaux côtières du Québec. Rapport sur l'état des stocks, C4-13, 8 p .
PELLETIER, L., 2000. Green sea urchin of the inshore waters of Quebec. Science, Stock Status Report, C4-13, 8 p .
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