Bottom Trawl Surveys - Proceedings of a Workshop Held at Ottawa ...
Bottom Trawl Surveys - Proceedings of a Workshop Held at Ottawa ...
Bottom Trawl Surveys - Proceedings of a Workshop Held at Ottawa ...
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226<br />
Tableau 5 - Pourcentage cumul<strong>at</strong>tf d'abondance par fitage selon les p§riodes du jour {1980).<br />
Heure: 00:00 06:00 10:00<br />
06:00 10:00 12:00<br />
Etage:<br />
v 6,4% 5,7% 9,3%<br />
IV 8,9% 10,3% 18,1%<br />
III 8,0% 14,4% 28,2%<br />
I I 7,0% 16,0% 30,3%<br />
I 4,7% 11,7% 14,1%<br />
Chalut YANKEE 41<br />
2,5 m<br />
15,7% 34,9% 58,5%<br />
CONCLUSION<br />
Les result<strong>at</strong>s obtenus ne peuvent etre<br />
consideres que comme partiels, puisqu'il est<br />
bien connu que l'ampleur de la migr<strong>at</strong>ion<br />
verticale de Pandalus borealis, varie en<br />
fonction du temps de l'ann§e {Carlsson et al .,<br />
1978, Smidt, 1978). Cette particularit§<br />
necessite que des essais de peche soient<br />
effectues avec 1 'echantillonneur vertical fitage<br />
a difffirentes periodes de l'annfie, si 1 'on veut<br />
estimer la vulnerabilite de l'espece dans le<br />
temps.<br />
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9,1% 6,3% 9,1% 10,2% 2,5%<br />
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