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Full-Text Articles in Life Sciences

Temporal Variations In Spawning Behavior Of Sea Scallops, Placopecten Magellanicus (Gmelin, 1791), In The Mid-Atlantic Resource Area, James E. Kirkley, William D. Dupaul Jan 1991

Temporal Variations In Spawning Behavior Of Sea Scallops, Placopecten Magellanicus (Gmelin, 1791), In The Mid-Atlantic Resource Area, James E. Kirkley, William D. Dupaul

VIMS Articles

Interannual variation in spawning of Placopecten magellanicus (Gmelin) may be important to management agencies concerned with maximizing yield-per-recruit via restrictions on meat counts or temporal restrictions on catch and effort. In this study, temporal patterns in the spawning behavior of sea scallops in the Mid-Atlantic resource area for the period April 1987-April 1991 are analyzed using conventional time-series methods. Biannual spawning was found to be characteristic of sea scallops in the Mid-Atlantic resource area but was also found to be erratic in the timing, duration, and magnitude. The spring spawning event was the more predictable and dominant spawning event. The ...


Commercial Practices And Fishery Regulations. The United States Northwest Atlantic Sea Scallop, Placopecten Magellanicus (Gmelin, 1791), Fishery, James E. Kirkley, William D. Dupaul Jan 1989

Commercial Practices And Fishery Regulations. The United States Northwest Atlantic Sea Scallop, Placopecten Magellanicus (Gmelin, 1791), Fishery, James E. Kirkley, William D. Dupaul

VIMS Articles

Fishery regulations are based on discipline specific concepts, empirical analyses, and public comment. Supporting empirical analyses, however, often neglect commercial fishing practices. If supporting analyses do not adequately consider commercial practices, resultant regulations may fail to achieve stated objectives and impose unnecessary costs on industry. This may have been the case for the United States Atlantic sea scallop, Placopecten magellanicus, fishery in which empirical analyses determined a target specification of 30 meats per pound, as a maximum average value, would provide significant long-term benefits in terms of yield per recruit and the overall productivity of the resource. Targeted meat count ...


Evidence Of A Semiannual Reproductive Cycle For The Sea Scallop, Placopecten Magellanicus (Gmelin, 1791), In The Mid-Atlantic Region, William D. Dupaul, James E. Kirkley, Anne C. Schmitzer Jan 1989

Evidence Of A Semiannual Reproductive Cycle For The Sea Scallop, Placopecten Magellanicus (Gmelin, 1791), In The Mid-Atlantic Region, William D. Dupaul, James E. Kirkley, Anne C. Schmitzer

VIMS Articles

The reproductive cycle of the sea scallop, Placopecten magellanicus in the mid-Atlantic region was studied over a 15 month period. One to 15 samples a month were collected from commercial vessels fishing from Long Island to Cape Hatteras in water depths of 37-68 m. Gonad weights were determined for four shell size intervals as an indicator of the reproductive cycle. A sharp decline in mean gonad weights between April-May 1987 and a subsequent increase and decrease in weights between SeptemberNovember 1987 indicated reproductive processes were occurring on a semiannual cycle. A major spring spawning season was reconfirmed in 1988 by ...