Predation behaviour of Cancer irroratus
and Carcinus maenas during conspecific and heterospecific challenges.
semisulcatus were higher than in most shrimps and crabs belonging the other areas studied previously, such as Callinectes sapidus, Penaeus stiferus, Xiphopenaeus kroyeri, Macrophthalmus depressus, Cancer irroratus
(Bu-Olayan and Subrahmanyam, 1998; Mantelatto et al.
Correlates of claw strength in the rock crab, Cancer irroratus
Role of prey odor in food recognition by rock crabs, Cancer irroratus
Effectiveness of escape vent shape in traps for catching legal-sized lobster, Homarus americanus, and harvestable-sized crabs, Cancer borealis and Cancer irroratus
The few enzymes that have been documented include trypsin and carboxypeptidases A and B in Callinectes sapidus (blue crab) (Dendinger, 1987; Dendinger and O'Connor, 1990); [alpha]-amylase in Carcinus maenas (green crab) (Blandamer and Beechy, 1964); and [alpha]-glucosidase in Cancer borealis (jonah crab), Cancer irroratus
(rock crab) (Brun and Wojtowicz, 1976), and C.
Distribution and catch composition of Jonah crab, Cancer borealis, and rock crab, Cancer irroratus
, near Boothbay Harbor.
The ontogenetic shift in diet with increasing size of lobsters was especially apparent for the three dominant food items: the contribution of bivalves and animal tissue (flesh) to volume of stomach contents decreased from the smallest lobsters (28% and 39%, respectively) to the largest lobsters (2% and 11%, respectively), whereas the reverse trend was seen for rock crab Cancer irroratus
(7% in smallest lobsters to 53% in largest lobsters).
The rock crab, Cancer irroratus
Say, uses chemically mediated learning in the search for food.
KEY WORDS: behavior, crab, Cancer irroratus
, Carcinus maenas, competition, prey density, temperature
Effectiveness of escape vent shape in traps for catching legal size lobsters, Homarus americanus, and harvestable-sized crabs, Cancer borealis and Cancer irroratus
The size-weight relationship of this species was similar, in value ranges, to that obtained for Cancer irroratus
by Krouse (1972), although this author did not find differences between sexes as were found in the present study.