Fecundity of red king crabs (Paralithodes camtschaticus) off Kodiak Island, Alaska, and an initial look at observer agreement of clutch fullness

Fecundity of red king crabs (Paralithodes camtschaticus) off Kodiak Island, Alaska, and an initial look at observer agreement of clutch fullness

B.A. Johnson, S.F. Blau, and R.E. Baglin

Fecundity of red king crabs (Paralithodes camtschaticus) off Kodiak Island, Alaska, and an initial look at observer agreement of clutch fullnessThis is part of Crabs in Cold Water Regions: Biology, Management, and Economics
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Description

Female red king crabs (Paralithodes camtschaticus) were collected to provide an estimate of fecundity (the total number of embryos in a clutch) based on the relationship between carapace length and fullness of clutch. Samples were combined from two studies conducted in waters adjacent to Kodiak Island, Alaska, in 1981 and 1986. Fecundity was estimated for 135 crabs and was shown to be linearly related to carapace length and relative clutch fullness with heteroscedastic errors. Carapace lengths ranged from 104 mm to 155 mm, and clutches were estimated to contain 59,607-358,574 embryos. Fecundity increased with increased carapace length, and showed wide variations in values. Clutch fullness ranged from 60% to 100%. Embryo weight was not related to carapace length. Results of independent classifications at 5% intervals of relative clutch fullness of 73 crabs by eight biologists were used to analyze the reliability of the classifications. Pairwise agreement among raters was less than moderate.

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