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Vol. 53 - Alaska Resources Library and Information Services

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Long-shelf density of Erimacrus larvae seemed to be greatest along<br />

the 100 m <strong>and</strong> 200 m isobaths of the middle shelf <strong>and</strong> oceanic regimes.<br />

Again the confluence of 50 m <strong>and</strong> 100 m isobaths just north of Unimak<br />

Isl<strong>and</strong> was the area of greatest occurrence <strong>and</strong> density (Fig. 5.4).<br />

Summary<br />

1) Erimacrus isenbeckii larvae were collected at 9% of all stations<br />

sampled during 1976-1981.<br />

2) These larvae were generally distributed throughout the study area<br />

but their frequency of occurrence was higher near the <strong>Alaska</strong><br />

Peninsula in the coastal, middle shelf <strong>and</strong> Unimak Is. regimes.<br />

3) Mean densities of larvae were appreciably higher in the eastern<br />

region of the southeastern Bering Sea than in the central <strong>and</strong><br />

western regions, while larval densities were very low at the<br />

Pribilofs which may reflect the fact that few samples were collected<br />

there.<br />

4) Zoeal stages were found in April through June <strong>and</strong> megalops larvae<br />

in June only.<br />

5.3.2.2 Oregoniinae (Hyas spp., Oregonia spp.)<br />

Seasonal Occurrence:<br />

Larvae of this taxon were present in the plankton<br />

from mid-April to early-October when all data were combined for years<br />

1976-1981 (Fig. 5.3). Each larval stage appeared as follows: SI, from<br />

mid-April to mid-July; SII, from early-June to mid-July <strong>and</strong> megalops<br />

larvae from early to mid-July <strong>and</strong> October.<br />

This time sequence was re-<br />

663

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