29.12.2013 Views

Vol. 53 - Alaska Resources Library and Information Services

Vol. 53 - Alaska Resources Library and Information Services

Vol. 53 - Alaska Resources Library and Information Services

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

2) The intermolt period of about 2 weeks seems to be the shortest of<br />

all the shrimp taxa.<br />

3) Crangonids are widely distributed over the St. George Basin <strong>and</strong><br />

extend into the middle <strong>and</strong> inner shelf domains.<br />

4) Crangonids were caught less frequently than either the p<strong>and</strong>alids or<br />

hippolytids.<br />

5) Greatest densities occurred over the outer shelf domain where average<br />

mean densities were 300-1000 larvae/100 m². Middle shelf domain<br />

densities were generally about 300 larvae/100 m². Outer shelf<br />

domain densities tended to be greater near the Pribilofs <strong>and</strong> the<br />

Aleutian Isl<strong>and</strong> chain rather than over the central St. George<br />

Basin.<br />

6) Larvae were distributed homogeneously throughout the water column<br />

from 0-80 m.<br />

6.6.4 Penaeidae<br />

The spiny larval form of disputed origin(s), currently assigned to<br />

the family Penaeidae, is assumed to come from deep dwelling parental<br />

stocks since larvae were most abundant at stations of depths >= 200 m.<br />

Larval Duration: Stage I spiny larvae were first taken in mid-April in<br />

1977, 1978, 1980 <strong>and</strong> 1981. Larval stage duration is shown in Figure<br />

6.33 for PROBES 1981 data. Note the very long durations for SII <strong>and</strong><br />

III; 75 days for SII, <strong>and</strong> 56 days for SIII. Although not shown by<br />

766

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!