Short-term survival and movements of Atlantic sharpnose sharks captured by hook-and-line in the north-east Gulf of Mexico

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作   者：

Gurshin CWD;  Szedlmayer ST; 

作者机构：

Farihope;  Auburn Univ;  AL 36532;  USA;  Szedlmayer ST;  Dept Fisheries;  Marine Fish Lab;  8300 State Highway 104; 

关键词：

Hook-and-line;  shark;  Water;  Blue;  Mortality;  California;  Juveniles;  Responses;  Negaprion-brevirostris;  Rate of movement;  Rhizoprionodon terraenovae;  Prionace-glauca;  Rhizoprionodon-terraenovae;  Tonic immobility;  Juvenile lemon sharks; 

期刊名称：

Journal of Fish Biology

i s s n：

0022-1112

年卷期：

2004 年 65 卷 4 期

页   码：

973-986

页   码：

摘   要：

Ultrasonic telemetry was used to compare post-release survival and movements of Atlantic sharpnose sharks Rhizoprionodon terraenovae in a coastal area of the north-east Gulf of Mexico. Ten fish were caught with standardized hook-and-line gear during June to October 1999. Atlantic sharpnose sharks were Continuously tracked after release for periods of 0(.)75 to 5(.)90 h and their positions recorded at a median interval of 9 min. Individual rate of movement was the mean of all distance and time measurements For each fish. Mean +/- S.E. individual rate of movement was 0(.)45 +/- 0(.)06 total lengths per second (L-T s(-1)) and ranged from 0(.)28 to 0(.)92 L-T s(-1) over all fish. Movement patterns did not differ between jaw and internally hooked Atlantic sharpnose sharks. Individual rate of movement was inversely correlated with bottom water temperature at capture (r(2) = 0(.)52, P < 0(.)05). No consistent direction in movement was detected for Atlantic sharpnose sharks after release, except that they avoided movement towards shallower areas. Capture-release survival was high (90%), with only one fish lot Surviving, i.e. this particular Fish stopped movement for a period of 10 min. Total rate of movement was total distance over total time (m min(-1)) for each Atlantic sharpnose shark. Mean total rate of movement was significantly higher immediately after release at 21(.)5m min(-1) over the first 1(.)5 h of tracking, then decreased to 11(.)2m min(-1) over 1(.)5-6h, and 7(.)7m min(-1) over 3-6h (Pless than or equal to0(.)002), Which Suggested initial post-release stress but quick recovery front capture. Thus, high survival (90%) and quick recovery indicate that the practice of catch-and-release would be a viable method to reduce capture mortality for R. terraenovae.