Vol. 53 - Alaska Resources Library and Information Services

2) While hatchout of P. borealis larvae does not occur over a protracted
period of time (no greater than a 3-week period), the hatchout
time for P. tridens and P. stenolepis may be somewhat longer.
3) P. borealis larvae are generally most abundant in the outer shelf
domain over the St. George Basin.
P. tridens larvae are most abundant
beyond the shelf break over deep water, but also range throughout
the outer shelf domain.
P. stenolepis occur over much of the
St. George Basin between the 100 and 200 m isobaths but with much
lower frequency than P. borealis or P. tridens larvae.
4) Mean densities of P. borealis larvae over the St. George Basin were
about 600-900 larvae/100 m 2 in May and June. Mean densities of P.
tridens larvae beyond the shelf break were about 600-1000 larvae/
100 m 2 in May and June. Mean densities for other species (P. stenolepis,
P. goniurus and Pandalopsis dispar) were significantly less.
5) Larvae were distributed homogeneously throughout the water column
from 0-80 m; more than 80% of larvae were found in the upper 60 m.
6) Larvae molt about every 2-3 weeks so P. borealis would progress
through six larval stages, metamorphose to a megalops,
and settle
to the benthos about mid-August.
P. tridens and P. stenolepis may
take until late August or early September because they have more
larval stages.
6.6.2 Hippolytidae
Larval Duration:
Hippolytid larvae were the only shrimp zoeae collected
in the early spring (mid-February to mid-March, NOAA cruise 1978),
when
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