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

摘要

This paper summarizes records from longline fishing programsconducted 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 fullyutilized and represents the following important findings. The relationship betweenclasper length and total length (TL) for bluntnose sixgill shark, Hexanchusgriseus (Bonnaterre), indicates that males mature at about 309 cm TL.High fecundity (114 pups) is reported for the prickly shark, Echinorhinus cookeiPietschmann. The smallest mature male E. cookei (183 cm TL) and the smallestpregnant (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 hammerheadshark, Sphyrna zygaena (L.), at 68 m, are also documented. Distributionsof deep-sea sharks in Hawai'i appear to be associated with isothermic submergence,and the sharks remain below the thermocline (100-400 m) and inwater temperatures of 9-12°C. Carcharhiniform sharks in Hawai'i range togreater depths than reported elsewhere; this appears to be correlated with theTropics having warmer water temperatures (20-26°C), which extend down to100-400 m in depth.