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FONSECA, D.B., B. SAINTE-MARIE, F. HAZEL, 2008. Longevity and change in shell condition of adult male snow crab >i>Chionoecetes opilio inferred from dactyl wear and markrecapture data. Trans. Am. Fish. Soc., 137(4): 1029-1043 .
Postmolt longevity and changes in the shell condition and body integrity of male snow crab Chionoecetes opilio after their terminal molt were assessed through a mark-recapture experiment and population censuses in a commercially unfished locality of eastern Canada. The experiment explored the value of dactyl wear as a quantitative measure and shell condition (SC; measured on a five-stage scale) as a relative index of shell age. Males were recaptured up to 6 years after release. Much of the extensive variation in observed dactyl wear was explained by time at liberty (Dt) and male size, and the extent of change in SC was positively correlated with Dt. The conservative wear-based estimate of male longevity was 7.7 years, a value 1-3 years greater than previously estimated. Dactyl wear and recapture data confirmed that SC is a relative, albeit rough, index of shell age. Shell hardness was positively correlated with male size and peaked in stage 3 about 3.5 years after the terminal molt. The number of missing pereopods increased with shell age and SC stage and overall was negatively correlated with male size. The commercial value of adult males may be highest at 1-4.5 years post-terminal molt and the reproductive value at 2-5.5 years.©2008 American Fisheries Society
GIGUÈRE, M., S. BRULOTTE, C. DULUC, F. HAZEL, S. PEREIRA, M. GAUDET, 2007. Recensements de l'huître américaine (Crassostrea virginica) dans le bassin aux Huîtres et la baie Clarke aux Îles-de-la-Madeleine, Québec. Rapp. tech. can. sci. halieut. aquat., 2695, 46 p .
Little is known of the growth of the sculptured shrimp Sclerocrangon boreas, a remarkable member of arctic and subarctic marine shelf communities. We determined the length-weight relationship, abdomen allometry, and size structure of shrimp in a population of the Gulf of Saint Lawrence, eastern Canada. We also reared shrimp for up to 3.5 years to measure their growth. The presence of very small immature females in the wild population indicates that the sculptured shrimp is not obligatorily a protandric hermaphrodite, if at all. Females grow faster, reach a greater size, and live longer than males. Males may be ≥4 years old at 17 mm cephalothorax length (CL) and females ≥6 years old at 29 mm CL. Ovigerous females have a broader abdomen with longer pleopod setae than similarly-sized immature females. After releasing their progeny, some females may molt and grow in length but revert to a condition of narrow abdomen and short pleopod setae, and then molt again to a condition of broad abdomen with long pleopod setae. This finding and demographic data suggest that some females are alternate-year spawners. Other females did not molt for ≥2 years and may spawn in successive years.©2007 The Crustacean Society
SAINTE-MARIE, B., N. URBANI, J.-M. SÉVIGNY, F. HAZEL, U. KUHNLEIN, 1999. Multiple choice criteria and the dynamics of assortative mating during the first breeding season of female snow crab Chionoecetes opilio (Brachyura, Majidae). Mar. Ecol. Prog. Ser., 181: 141-153 .
HAZEL, F., 1993. Preparing for a dive. Diver Magazine, juin 1993 .
HAZEL, F., 1993. When is a commercial diver not a commercial diver?. Diver Magazine, mars 1993 .
DUTIL, J.-D., J. MUNRO, R. DUFOUR, Y. GAUTHIER, F. HAZEL, B. SAINTE-MARIE, L. PROVENCHER, J. BOYER, D. HARDY, 1993. L'élevage du crabe des neiges : bilan des travaux de recherche. Ministère des pêches et des océans, Programme fédéral de développement des pêches du Québec, 12 p .
SAINTE-MARIE, B., F. HAZEL, 1992. Moulting and mating of snow crab, Chionoecetes opilio (O. Fabricius), in shallow waters of the northwestern Gulf of Saint Lawrence. Can. J. Fish. Aquat. Sci., 49: 1282-1293 .
GAUTHIER, D., F. HAZEL, 1988. Abondance du homard américain (Homarus americanus) à l'île d'Anticosti. CSCPCA doc. rech., 88/36, 29 p .
GAUTHIER, D., F. HAZEL, 1986. Les évents d'échappement sur les casiers à homard : détermination de la dimension optimale. CSCPCA doc. rech., 86/71, 36 p .
Carapace measurements were taken from 922 lobsters collected from eight areas in Québec. Whit the prospect of the introduction of escape vents on lobster traps, we estimated the extent of the allometric variability of the carapace length-width relationship between regions and sexes. The comparison of length-width regression lines revealed sexual and regional differences in carapaces allometry. For a given length, the carapace of males was narrower than that of females. For both sexes from La Tabatière, carapace was narrower than in other regions. The regression equations were used to calculate the cumulative normal distribution of carapace width, which determines escapement. For legal size limit (76.2 mm CL) and males from all regions, except northwest of the Magdalen Islands and La Tabatière, the width distribution grids indicated that 99.6 % and 96.8 % were retained by 43 mm and 44 mm vents, respectively. Male lobsters from the northwest area of the Islands and from La Tabatière are slightly narrower. For female lobsters of all regions, except the southeast of the Magdalen Islands and La Tabatière 99.9 % and 99.1 %, were retained whit 43 mm and 44 mm vents, respectively. Female lobsters from the southeast of the Islands are slightly wider, while those from La Tabatière are slightly narrower. For the Magdalen Islands, these ``theoretical escapement rates`` corresponding to given vent sizes were applied to commercial catches sampled in 1985. With a 44 mm vent, escapement of sublegals varied according to the fishing areas of the archipelago, from 55.0 to 73.1 %. Retention of commercials was complete. With a 45 mm vent, escapement of sublegals reach 68.9-82.2 % while retention of commercials exceeded 99 %. Taking into account the carapace width distribution, the compressibility of the carapace and a possible increase in yield per effort resulting from the desaturation of traps, we recommend, for a 76.2 mm CL minimum legal size, the use of 43 mm and 44 mm wide vents for La Tabatière and for other areas of Québec respectively. If the target length was to be 81.0 mm CL, we recommend the use of 45 mm and 46 mm wide vents for La Tabatière and for other areas of Quebec, respectively. Finally, the use of a 44 mm vent in all areas of recommended if the present legal size is increased simultaneously to 81 mm CL for the North Shore and remains 76.2 mm CL elsewhere. The use of 44 mm vent in La Tabatière region would not lessen much the benefits of the measure compared to the use of the optimal 45 mm vent.
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