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Bycatch estimates of coastal bottlenose dolphin (Tursiops Truncatus) in U.S. Mid-Atlantic gillnet fisheries for 1996 to 2000
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  • Alternative Title:
    Bottlenose dolphin (Tursiops Truncatus) in U.S. Mid-Atlantic gillnet fisheries for 1996 to 2000
  • Description:
    "To assess the status of coastal bottlenose dolphins (Tursiops truncatus), estimates of population size and human-caused mortalities are required. The purpose of this manuscript is to estimate human-caused mortalities of coastal bottlenose dolphins due to bycatch in mid-Atlantic gillnet fisheries operating during 1996 to 2000 in oceanic waters (outside of bays) adjacent to New Jersey to North Carolina. During summer (May to October), three coastal bottlenose dolphin management units reside in these waters: the Northern migratory, Northern NC, and Southern NC management units, and during winter (November to April) there is one management unit: the mixed stock management unit. This management unit was divided into two sub-units, one off North Carolina and one off Virginia. This is because, during winter most coastal bottlenose dolphins are off North Carolina, however, a small percentage are off Virginia; thus, bycatch rates off these two states differ. The management units in waters north of Cape Hatteras extend12 km offshore, and those south of Cape Hatteras extend 27 km offshore. Total bycatch was defined as the product of the bycatch rate, takes per unit effort, estimated from a sample of the fishery, and the total effort from the fishery. Due to practical reasons, bycatch rates were defined as the ratio of observed dead coastal bottlenose dolphins to observed metric tons of fish landed. Consequently, total effort was total commercial gillnet landings"--Executive summary.
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