. Commercial fisheries review. Fisheries; Fish trade. June 1958 COMMERCIAL FISHERIES REVIEW 7 Bay. It is caught by many and diverse forms of fishing gear in salty, deep channels, of the Bay and in brackish waters of its river tributaries, often quite far up the rivers in water of extremely low salinity. TotEil catch in Chesapeake Bay has fluctuated considerably in its 80-year his- tory (fig. 1), although in the early years, from 1880 to 1915, fluctuations were un- noticed. Since 1929, the average annual catch has been about 55 million pounds. In the last ten years, Chesapeake Bay has had an av
. Commercial fisheries review. Fisheries; Fish trade. June 1958 COMMERCIAL FISHERIES REVIEW 7 Bay. It is caught by many and diverse forms of fishing gear in salty, deep channels, of the Bay and in brackish waters of its river tributaries, often quite far up the rivers in water of extremely low salinity. TotEil catch in Chesapeake Bay has fluctuated considerably in its 80-year his- tory (fig. 1), although in the early years, from 1880 to 1915, fluctuations were un- noticed. Since 1929, the average annual catch has been about 55 million pounds. In the last ten years, Chesapeake Bay has had an average annual production of about 60 million pounds, currently valued at about $3 million, approximately two-thirds of the entire United States blue crab harvest. Many closely-related crabs have the same characteristic body form, the flatly- expanded final segment of the fifth leg, and nine pairs of spines lateral to the eyes. The best diagnostic character of Callinectes sapidus is a set of four, instead of six, teeth on the margin of the shell between the eyes (two frontal and two inner-ocular teeth)--Rathbun 1930. Detail which will not be repeated here may be found in the authoritative accounts on taxonomy and distribution (Rathbun 1896, 1930); anatomy and histology (Cochran 1935; Cronin 1942, 1947; Hopkins 1943, 1944; Pyle and Cronin 1950); bibliography (Cronin, Van Engel, Cargo and Wojcik 1957). MATING Sex of the blue crab is easily recognized by differences in shape of the abdomen, or apron as it is frequently called (fig. 2), and by the abdominal appendages. The male abdomen, long, slender and T-shaped, carries two pairs of ap- pendages used in mating, two long intromittent organs and two short- er accessory organs. The abdo- men of an immature male is tight- ly sealed to the ventral surface of the shell, while on a mating male the abdomen hangs free or is held in place by a pair of "snap-fasten- er-like" tubercles. In the young female the abdomen is triangular a
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