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Increases in fishing effort over the last three decades may have resulted in changes in life hist... more Increases in fishing effort over the last three decades may have resulted in changes in life history patterns of tilefishes. The purpose of this study was to test this hypothesis by assessing the life history from two periods (1980-87 and 1996-98). Tilefish were collected from the southeastern United States for life history analysis using bottom-longline gear deployed by commercial fishermen and during research cruises. Sagittae from a total of 2,484 tilefish were aged successfully. Observed length at age data indicated that male and female tilefish were significantly smaller at most ages during 1996-98 than during 1980-87. Most fish examined (99%) were sexually mature. Up to and during the period of heavy exploitation of tilefish (1980-87), the overall sex ratio was not significantly different from 1:1, however during 1996-98 the sex ratio was significantly different (1:1.35, male: female). Male and female tilefish spawn from March through November with a spawning peak occurring be...
Otoliths and gonadal tissue were taken from red snapper collected from fishery-inde- p endent and... more Otoliths and gonadal tissue were taken from red snapper collected from fishery-inde- p endent and fishery-dependent sources between Cape Lookout, North Carolina and Key West, Florida during 1979-2000. The mean size of red snapper from fishery-dependent samples was 594 mm TL and ranged from 70-976 mm TL. Fish sampled with fishery- independent gear had a significantly smaller mean TL (426
Increases in fishing effort over the last three decades may have resulted in changes in life hist... more Increases in fishing effort over the last three decades may have resulted in changes in life history patterns of tilefishes. The purpose of this study was to test this hypothesis by assessing the life history from two periods (1980-87 and 1996-98). Tilefish were collected from the southeastern United States for life history analysis using bottom-longline gear deployed by commercial fishermen and during research cruises. Sagittae from a total of 2,484 tilefish were aged successfully. Observed length at age data indicated that male and female tilefish were significantly smaller at most ages during 1996-98 than during 1980-87. Most fish examined (99%) were sexually mature. Up to and during the period of heavy exploitation of tilefish (1980-87), the overall sex ratio was not significantly different from 1:1, however during 1996-98 the sex ratio was significantly different (1:1.35, male: female). Male and female tilefish spawn from March through November with a spawning peak occurring be...
Otoliths and gonadal tissue were taken from red snapper collected from fishery-inde- p endent and... more Otoliths and gonadal tissue were taken from red snapper collected from fishery-inde- p endent and fishery-dependent sources between Cape Lookout, North Carolina and Key West, Florida during 1979-2000. The mean size of red snapper from fishery-dependent samples was 594 mm TL and ranged from 70-976 mm TL. Fish sampled with fishery- independent gear had a significantly smaller mean TL (426