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Vol. 53 - Alaska Resources Library and Information Services

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3) Larval duration in the plankton is expected to last 3.5-4.0 months<br />

for most species which have 4 zoeal plus a megalops stage <strong>and</strong> an<br />

intermolt period of approximately 3 weeks.<br />

4) Greatest larval densities appeared in a continuous b<strong>and</strong> along <strong>and</strong><br />

east of the 100 m isobath <strong>and</strong> <strong>and</strong> along the Aleutian Isl<strong>and</strong>s from<br />

Amak Isl<strong>and</strong> to Akutan Isl<strong>and</strong> between the 50-100 m isobaths; there<br />

was a substantial decline in density over the St. George Basin.<br />

Larval densities across the middle shelf domain were 10-fold higher<br />

than densities beyond the shelf break <strong>and</strong> 3-5 times higher than<br />

outer shelf densities during May <strong>and</strong> June (7566/100 m 2 vs. 249/100<br />

m 2 vs 658/100 m 2 in 1978).<br />

5) Pagurid larvae were generally concentrated in the upper 40 meters<br />

at both middle <strong>and</strong> outer shelf stations, <strong>and</strong> there was an indication<br />

of diel vertical migration toward the surface during dark<br />

hours.<br />

795

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