American plaice
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Recent papers in American plaice
Six bottom trawl surveys carried out in the southeastern Gulf of St. Lawrence between September 1986 and September 1987 indicated a marked seasonal cycle in distribution and relative abundance of demersal fish. Atlantic cod (Gadus... more
Six bottom trawl surveys carried out in the southeastern Gulf of St. Lawrence between September 1986 and September 1987 indicated a marked seasonal cycle in distribution and relative abundance of demersal fish. Atlantic cod (Gadus morhua), white hake (Urophycis tenuis) and American plaice (Hippoglossoides platessoides) exhibited the greatest movement, migrating out of the shallow water of the southeastern Gulf in winter and returning in spring. Yellowtail flounder (Limanda jerruginea) and winter flounder (Pseudopleuronectes americanus) undertook limited movements with a portion of the population remaining in shallow water year round. Longhorn sculpin (Myoxocephalus octodecemspinosus) moved to slightly deeper water in winter but remained in the water shallower than 100 m where the bottom temperature reached OoC or below. Thorny skate (Raja radiata) exhibited a winter migration to the warmer waters of the southern slopes of the Laurentian Channel and returned to the shallows of the southeastern Gulf in summer. There was also an indication of at least a partial movement of this species out of the Laurentian Channel to the Atlantic. Winter skate (Raja ocellata) moved to slightly deeper water in winter, although not as far as the Laurentian Channel, and then dispersed back to the shallows in summer. Smooth skate (Raja senta) exhibited no seasonal movement and remained in the relatively warm, stable, deeper water of the Laurentian Channel and Cape Breton Trough.
Six recensements au chalut de fond effectues dans Ie sud-est du golfe du Saint-Laurent entre septembre 1986 et septembre 1987 ont revele un cycle saisonnier marque dans la distribution ainsi que dans I'abondance relative des poissons demersaux. La morue franche (Gadus morhua), la merluche (Urophycis tenuis) et la plie canadienne (Hippogiossoides platessoides) se deplac;ent Ie plus, quittant les eaux peu profondes du sud-est du Golfe en hiver et y retournant au printemps. La limande it queue jaune (Limanda jerruginea) et la plie rouge (Pseudopieuronectes americanus) se deplac;ent assez peu puisqu'une partie de la population demeure en eaux peu profondes tout I'annee. Le chaboisseau it dix-huit epines (Myoxocephaius octodecemspinosus) migre vers des eaux legerement plus profon-des en hiver, mais il demeure it une profondeur de moins de 100 m ou la temperature de fond atteint OoC ou moins. La raie radiee (Raja radiata) migre en hiver vers les eaux plus chaudes des pentes sud du Chenal Laurentien et revient dans les bas-fonds du sud-est du golfe du Saint-Laurent en ete. II semble aussi qu'une partie de la population de cette espece quitte Ie Chenal Laurentien pour se rendre jusque dans l' Atlantique. La raie tachetee (Raja ocellata) migre vers des eaux legerement plus profondes en hiver, sans toutefois se rendre jusqu'au Chenal Laurentien et elle se disperse it nou-veau sur les bas-fonds en ete. La raie lisse (Raja senta) ne montre aucun mouvement saisonnier et demeure dans les eaux plus profondes et relativement stables et chaudes du Chenal Laurentien et de la fosse du Cap-Breton.
Six recensements au chalut de fond effectues dans Ie sud-est du golfe du Saint-Laurent entre septembre 1986 et septembre 1987 ont revele un cycle saisonnier marque dans la distribution ainsi que dans I'abondance relative des poissons demersaux. La morue franche (Gadus morhua), la merluche (Urophycis tenuis) et la plie canadienne (Hippogiossoides platessoides) se deplac;ent Ie plus, quittant les eaux peu profondes du sud-est du Golfe en hiver et y retournant au printemps. La limande it queue jaune (Limanda jerruginea) et la plie rouge (Pseudopieuronectes americanus) se deplac;ent assez peu puisqu'une partie de la population demeure en eaux peu profondes tout I'annee. Le chaboisseau it dix-huit epines (Myoxocephaius octodecemspinosus) migre vers des eaux legerement plus profon-des en hiver, mais il demeure it une profondeur de moins de 100 m ou la temperature de fond atteint OoC ou moins. La raie radiee (Raja radiata) migre en hiver vers les eaux plus chaudes des pentes sud du Chenal Laurentien et revient dans les bas-fonds du sud-est du golfe du Saint-Laurent en ete. II semble aussi qu'une partie de la population de cette espece quitte Ie Chenal Laurentien pour se rendre jusque dans l' Atlantique. La raie tachetee (Raja ocellata) migre vers des eaux legerement plus profondes en hiver, sans toutefois se rendre jusqu'au Chenal Laurentien et elle se disperse it nou-veau sur les bas-fonds en ete. La raie lisse (Raja senta) ne montre aucun mouvement saisonnier et demeure dans les eaux plus profondes et relativement stables et chaudes du Chenal Laurentien et de la fosse du Cap-Breton.
American plaice in the southern Gulf of St. Lawrence were found to be in a relatively stable state over the past several years. A changing pattern of discarding at sea was found and this has eroded further the confidence of the commercial... more
American plaice in the southern Gulf of St. Lawrence were found to
be in a relatively stable state over the past several years. A changing
pattern of discarding at sea was found and this has eroded further the
confidence of the commercial catch sampling data. These data are normally
used in the preparation of the annual catch-at-age matrix. Without these
data no analytical assessment is possible. Possible reasons for the
changing discard pattern include changes in minimum mesh size
regulations, changes in abundance of the Gulf cod stock, changes in the
prices paid for plaice with regards prices paid for cod, and changes in
gear composition of the fishing fleet.
No change in the status of the northern Gulf of St. Lawrence
American plaice, Gulf yellowtail, witch, winter flounder, or Atlantic
halibut was observed.
Mesh selection ogives were calculated for 60, 90, 100, 110, 120,
130 mm mesh codend nets for American plaice. These ogives were used in
the estimation of discard levels over the previous decade.
be in a relatively stable state over the past several years. A changing
pattern of discarding at sea was found and this has eroded further the
confidence of the commercial catch sampling data. These data are normally
used in the preparation of the annual catch-at-age matrix. Without these
data no analytical assessment is possible. Possible reasons for the
changing discard pattern include changes in minimum mesh size
regulations, changes in abundance of the Gulf cod stock, changes in the
prices paid for plaice with regards prices paid for cod, and changes in
gear composition of the fishing fleet.
No change in the status of the northern Gulf of St. Lawrence
American plaice, Gulf yellowtail, witch, winter flounder, or Atlantic
halibut was observed.
Mesh selection ogives were calculated for 60, 90, 100, 110, 120,
130 mm mesh codend nets for American plaice. These ogives were used in
the estimation of discard levels over the previous decade.