Vol. 53 - Alaska Resources Library and Information Services

also July of 1981.
Within strata, both positive values (stations where
larvae were caught) and zero stations were averaged for comparisons and
contrasts of intra- and interannual density and distribution along or
across the shelf.
5.3.2.1 Erimacrus isenbeckii
Seasonal Occurrence:
Larvae of this species were generally uncommon but
were collected in the plankton from mid-April to late-June when data
from all the sampling periods of the years 1976-1981 were combined (Fig.
5.3). Individual larval stages were present as follows: Stage I (SI),
from late-April to mid-June; SII, from mid-April to mid-June; SIII, from
mid-May to mid-June; SIV in mid-April and June; SV, in June; and
megalops larvae in June.
Because the seasonal occurrence of SI and IV larvae did not overlap
from year to year, gaps appear in the bars representing occurrence of
these stages over the sampling periods of all years combined in Figure
5.3
Distribution:
Larvae of E. isenbeckii were collected at only 9% of the
stations analyzed from the years 1976-81.
Of the samples with larvae,
85% were collected in May and June, which was therefore the time frame
selected in which to examine frequency of occurrence. Frequency of
occurrence (percent) of Erimacrus larvae is listed by stratum in Table
5.5 and the locations of stations at which Erimacrus larvae were collected
are plotted on a map of the study area in Figure 5.4.
These results
show that larvae were collected throughout the study area, but were most
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