. An ecological characterization of Coastal Maine (north and east of Cape Elizabeth) . J_ J_ »I961 ⺠tybtl â * lbcJ ty6b _i_ _u a_ J 13 14 15 16 17 18 19 Figure 12-5. 2 3 4 5 6 7 8 9 10 11 12 NUMBER OF TRAPS (X105) Correlation of lobster catch (thousands of metric tons) and number of traps fished (hundred thousands) in Maine for 1897 to 1976 (Maine Department of Marine Resources 1977). commercial aquaculture. Although this species has been raised to adulthood in the laboratory, large-scale aquaculture is impractical. The aggressiveness of the species requires that each lobster be raised in a
. An ecological characterization of Coastal Maine (north and east of Cape Elizabeth) . J_ J_ »I961 ⺠tybtl â * lbcJ ty6b _i_ _u a_ J 13 14 15 16 17 18 19 Figure 12-5. 2 3 4 5 6 7 8 9 10 11 12 NUMBER OF TRAPS (X105) Correlation of lobster catch (thousands of metric tons) and number of traps fished (hundred thousands) in Maine for 1897 to 1976 (Maine Department of Marine Resources 1977). commercial aquaculture. Although this species has been raised to adulthood in the laboratory, large-scale aquaculture is impractical. The aggressiveness of the species requires that each lobster be raised in an individual container, feeding is expensive, and lobsters are more susceptible to disease in culture than in the natural environment. ROCK CRAB (Cancer irroratus) and JONAH CRAB (Cancer borealis) A small commercial crab fishery in Maine is supported by the rock crab and the Jonah crab. Most Maine fishermen commonly refer to C. borealis as the rock crab and to C. irroratus as the sand or mud crab. Both species are brachyurans, or true crabs, and may reach a size of inches (60 mm) at maturity (Krouse 1976). Females tend to be smaller than males. Although neither species has been studied extensively, more information is available on the life cycle and habits of the rock crab than of the Jonah crab. Distribution and Abundance These 2 species of crab range from Labrador to Florida (TRIGOM 1974). The rock crab is the more abundant of the two in the intertidal zone of coastal Maine and may be found from low water to 1980 feet (600 m). The Jonah crab may be found from the shallow subtidal zone to a depth of 2640 feet (800 m) (Gosner 1971). The major areas of harvest of crabs in coastal Maine are in 12-18
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