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Shark Records from Longline Fishing Programs in Hawai'i with Comments on Pacific Ocean Distributions

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Title: Shark Records from Longline Fishing Programs in Hawai'i with Comments on Pacific Ocean Distributions
Authors: Crow, Gerald L.
Lowe, Christopher G.
Wetherbee, Bradley M.
Issue Date: Oct 1996
Publisher: University of Hawaii Press
Citation: Crow GL, Lowe CG, Wetherbee BM. 1996. Shark records from longline fishing programs in Hawai'i with comments on Pacific Ocean distributions. Pac Sci 50(4): 382-392.
Abstract: This paper summarizes records from longline fishing programs
conducted in Hawai'i between 1959 and 1980. Data from 11 species of sharks
(173 individual sharks) are reported and compared with worldwide records.
Although much of the data is nearly 30 yr old, the information was never fully
utilized and represents the following important findings. The relationship between
clasper length and total length (TL) for bluntnose sixgill shark, Hexanchus
griseus (Bonnaterre), indicates that males mature at about 309 cm TL.
High fecundity (114 pups) is reported for the prickly shark, Echinorhinus cookei
Pietschmann. The smallest mature male E. cookei (183 cm TL) and the smallest
pregnant (205 cm TL) bignose shark, Carcharhinus altimus (Springer), are recorded.
New maximum depth of capture records for the blacktip shark,
Carcharhinus Umbatus (Valenciennes), at 64 m, and for the smooth hammerhead
shark, Sphyrna zygaena (L.), at 68 m, are also documented. Distributions
of deep-sea sharks in Hawai'i appear to be associated with isothermic submergence,
and the sharks remain below the thermocline (100-400 m) and in
water temperatures of 9-12°C. Carcharhiniform sharks in Hawai'i range to
greater depths than reported elsewhere; this appears to be correlated with the
Tropics having warmer water temperatures (20-26°C), which extend down to
100-400 m in depth.
URI/DOI: http://hdl.handle.net/10125/2913
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 50, Number 4, 1996



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