Vol. 53 - Alaska Resources Library and Information Services

Distribution and Abundance: Larvae of the species were found in only 2%
of all stations, the lowest percentage of all non-Chionoecetes Brachyura
taxa studied.
This is reflected by the low frequency-of-occurrence
within each stratum that never exceeded 14% (Table 5.9).
Little can be
said of their distribution other than the surprising scarcity (Fig.
5.17). Since Izembek Lagoon is known to support large populations of
adults (McRoy 1966), higher larval densities in that area were expected.
However, the majority of all larvae found were at stations less than 50
m deep nearshore (Fig. 5.18), where the mean density was 552/100 m².
The highest single density found was 1195 larvae/100 m².
Summary
1) Larvae were only collected at 2% of all stations sampled during
1976-1981.
2) No larvae were collected in water deeper than 200 m, near the
Pribilof Islands or in the central region of the middle shelf.
3) Distribution and density appear related to depth since the highest
relative frequency-of-occurrence and the highest relative mean
density of these larvae were found in water shallower than 50 m.
5.3.2.6 Acanthonychinae and Pisinae
Seasonal Occurrence:
Larval stages of these subfamilies were found in
the plankton from late-April to mid-July, a total period of 12 weeks,
when their appearance in all the sampling periods of the years 1976 to
1981 were combined (Fig. 5.3). Individual larval stages were present
during these sampling periods as follows:
SI, from late-April to
690