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Vol. 53 - Alaska Resources Library and Information Services

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P<strong>and</strong>alopsis dispar was taken only once during the following<br />

cruises; PROBES 1981, NOAA 1981 (R/V <strong>Alaska</strong>), PROBES 1980 <strong>and</strong> 1978, thus<br />

making it the least frequently caught p<strong>and</strong>alid species. Stages I, II,<br />

IV,<strong>and</strong> V were taken during the months of June <strong>and</strong> July.<br />

The northernmost<br />

range for this shrimp is given as the Pribilof Isl<strong>and</strong>s where the<br />

NOAA 1981 (R/V <strong>Alaska</strong>) cruise caught a single animal.<br />

Distribution <strong>and</strong> Abundance of P<strong>and</strong>alus borealis:<br />

Larvae of this species<br />

were found in the greatest abundance between the 100 <strong>and</strong> 200 m isobaths<br />

over the St. George Basin (Figs. 6.6 to 6.9).<br />

Highest P. borealis<br />

larval densities were found during the NOAA 1977 cruise in April <strong>and</strong> May<br />

(Figure 6.6) with concentrations ranging from 1200-6200 larvae/100 m².<br />

Comparably high larval densities, ranging from 1100-7200 larvae/100 m 2 ,<br />

were also found in June 1979 (NOAA cruise, not pictured). PROBES 1980<br />

larval densities for P. borealis followed this same general distribution<br />

pattern but with higher abundances near the 100 m isobath.<br />

In marked contrast, very low P. borealis densities were found during<br />

the 1981 PROBES <strong>and</strong> NOAA cruises compared to 1977 (Fig. 6.7 vs. 6.6).<br />

Although larvae seemed to be more widely dispersed up into the middle<br />

shelf domain during 1981,<br />

their abundance over the outer shelf domain<br />

was rarely greater than 500 larvae/100 m².<br />

Monthly variation in P. borealis distribution <strong>and</strong> abundance between<br />

April <strong>and</strong> May/June 1978 is shown in Figures 6.8 <strong>and</strong> 6.9.<br />

The relatively<br />

clustered pattern of high density (1000-5000 larvae/100 m 2 ) in April<br />

1978 (Fig. 6.8) over the central outer shelf, spread throughout the St.<br />

722

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