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Vol. 53 - Alaska Resources Library and Information Services

Vol. 53 - Alaska Resources Library and Information Services

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shrimp survey conducted in Unalaska, Makushin <strong>and</strong> Pavlof Bays.<br />

Biomass<br />

estimates for Unalaska Bay for 1979 were 0.95 million lbs for P.<br />

borealis compared to 8.1 million lbs in 1978.<br />

Population estimates for<br />

1979 were only 10-35% of 1978 estimates indicating a substantial<br />

decline.<br />

No biomass estimates have appeared in the literature recently for<br />

the St. George Basin shrimp populations, <strong>and</strong> no commercial shrimp fishery<br />

is presently centered in that area.<br />

6.2.3. Other P<strong>and</strong>alus spp.<br />

Other p<strong>and</strong>alids in the southeastern Bering Sea include P. goniurus,<br />

P. tridens, P. stenolepis <strong>and</strong> P<strong>and</strong>alopsis dispar. The range of P.<br />

goniurus, the flexed p<strong>and</strong>alid, is from the Chukchi Sea <strong>and</strong> Bering Sea to<br />

Puget Sound in 5-450 m (Butler 1980).<br />

In southeastern Bering Sea this<br />

shrimp prefers depths of 38-124 m <strong>and</strong> a mud to coarse s<strong>and</strong> bottom habitat<br />

at -.3° to 6.4°C (McLaughlin 1963).<br />

Very few P. goniurus zoeae have<br />

been found in our samples (see Section 6.6.1, Results <strong>and</strong> Discussion).<br />

P. tridens, the yellow leg p<strong>and</strong>alid, ranges from the Bering Sea to<br />

San Nicholas Isl<strong>and</strong>, California, in 5-1984 m (from Butler 1980).<br />

Adults<br />

prefer depths of 200-470 m <strong>and</strong> rocky habitats.<br />

The reproductive biology<br />

for P. tridens, also a prot<strong>and</strong>ric hemaphrodite, has been studied for<br />

Canadian populations (Butler 1964) but remains fragmentary for the<br />

Bering Sea.<br />

Haynes' (1980) study of P. tridens larvae snow growth from<br />

3.2 mm Total Length (TL) for SI to 13.0 mm TL for SVII <strong>and</strong> megalops. No<br />

data are available for age <strong>and</strong> size at maturation for males <strong>and</strong> females<br />

703

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