TL;DR: These traits are interpreted as bioenergetic adaptations to food-limited conditions in Subantarctic regions, where a pronounced seasonality of day length limits the period of primary production, while low temperatures enforce a long duration of pelagic development.
TL;DR: In the extremities of a deep northern British Columbia fjord system 40.5% of golden king crabs Lithodes aequispina Benedict were parasitized by the rhizocephalan barnacle Briarosaccus callosus Boschma, and male body size and a secondary sexual characteristic of right cheliped allometry were decreased in parasitized crabs.
TL;DR: In this paper, the size at maturity of fjord-dwelling golden king crabs, Lithodes aequispina, from northern British Columbia is 114 mm carapace length (CL) based on chela allometry, and 105.5 mm CL for females, based on the presence of "eggs" (embryos) or empty egg cases on the pleopod setae.
Abstract: Size at maturity of fjord-dwelling golden king crabs, Lithodes aequispina, from northern British Columbia is 114 mm carapace length (CL) for males, based on chela allometry, and 105.5 mm CL for females, based on the presence of "eggs" (embryos) or empty egg cases on the pleopod setae. Females carried up to 27,000 "eggs." Fecundity (F), measured soon after egg extrusion, increases with carapace length according to: F = – 18,760 + 294 CL. Embryo mortality, from egg extrusion until the appearance of embryonic eyes, decreases from 13% for 110 mm CL females to 8% for 140 mm females. Mean length of external "eggs" immediately before hatching is 2.4 mm. Based on the size limit at maturity and estimates of growth rate, a minimum commercial size limit of 163 mm CL (=181 mm carapace width, including lateral spines) would protect males for three years after maturity is reached.
TL;DR: Temporal pattern of hatching was studied in the subantarctic lithodid crabs Lithodes santolla (Molina) and Paralomis granulosa (Jaquinot) from the Argentine Beagle Channel, where larval hatching occurred in low daily numbers over an extended period of up to several weeks, depending on hatch size.
Abstract: Temporal pattern of hatching was studied in the subantarctic lithodid crabs Lithodes santolla (Molina) and Paralomis granulosa (Jaquinot) from the Argentine Beagle Channel. In both species, larval hatching occurred in low daily numbers over an extended period of up to several weeks, depending on hatch size. Low daily hatching activity and low oxygen-consumption rates in freshly hatched P. granulosa larvae are discussed as life history adaptations to, and/or physiological constraints by, the environmental conditions of high latitudes.
TL;DR: Based on the size limit at maturity and estimates of growth rate, a minimum commercial size limit of 163 mm CL (=181 mm carapace width, including lateral spines) would protect males for three years after maturity is reached.
Abstract: Size at maturity of fjord-dwelling golden king crabs, Lithodes aequispina, from northern British Columbia is 114 mm carapace length (CL) for males, based on chela allometry, and 105.5 mm CL for females, based on the presence of"eggs" (embryos) or empty egg cases on the pleopod setae. Females carried up to 27,000 "eggs." Fecundity (F), measured soon after egg extrusion, increases with carapace length according to: F = -18,760 + 294 CL. Embryo mortality, from egg extrusion until the appearance of embryonic eyes, decreases from 13% for 110 mm CL females to 8% for 140 mm females. Mean length of external "eggs" immediately before hatching is 2.4 mm. Based on the size limit at maturity and estimates of growth rate, a minimum commercial size limit of 163 mm CL (=181 mm carapace width, including lateral spines) would protect males for three years after maturity is reached.