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- Title
Short-term survival and movements of Atlantic sharpnose sharks captured by hook-and-line in the north-east Gulf of Mexico.
- Authors
Gurshin, C.W.D.; Szedlmayer, S.T.
- Abstract
Ultrasonic telemetry was used to compare post-release survival and movements of Atlantic sharpnose sharksRhizoprionodon terraenovaein 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( LT s−1) and ranged from 0·28 to 0·92 LT 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( r2 = 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 not 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 21·5 m min−1 over the first 1·5 h of tracking, then decreased to 11·2 m min−1 over 1·5–6 h, and 7·7 m min−1 over 3–6 h( P ≤ 0·002), which suggested initial post-release stress but quick recovery from 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 forR. terraenovae.
- Subjects
GULF of Mexico; ATLANTIC sharpnose shark; SHARKS; RHIZOPRIONODON; BIOTELEMETRY; WATER temperature
- Publication
Journal of Fish Biology, 2004, Vol 65, Issue 4, p973
- ISSN
0022-1112
- Publication type
Article
- DOI
10.1111/j.0022-1112.2004.00501.x