Characterizing environmental and spatial variables associated with the incidental catch of olive ridley (Lepidochelys olivacea) in the Eastern Tropical Pacific purse-seine fishery

2015 ◽  
Vol 25 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Jose T. Montero ◽  
Raul O. Martinez-Rincon ◽  
Selina S. Heppell ◽  
Martin Hall ◽  
Michael Ewal
Keyword(s):  
Tropical Pacific ◽  
Purse Seine ◽  
Eastern Tropical Pacific ◽  
Olive Ridley ◽  
Spatial Variables ◽  
Lepidochelys Olivacea ◽  
Incidental Catch ◽  
Purse Seine Fishery

Growth and reproduction of female eastern and whitebelly spinner dolphins incidentally killed in the eastern tropical Pacific tuna purse-seine fishery

2009 ◽  
Vol 87 (6) ◽  
pp. 537-552 ◽  
Author(s):  
Jason P. Larese ◽  
Susan J. Chivers
Keyword(s):  
Pregnancy Rate ◽  
Tropical Pacific ◽  
Purse Seine ◽  
Calving Interval ◽  
Eastern Tropical Pacific ◽  
Population Growth Rates ◽  
Stenella Longirostris ◽  
The Mean ◽  
Spinner Dolphins ◽  
Purse Seine Fishery

Life-history parameters are estimated for two forms of the spinner dolphin ( Stenella longirostris (Gray, 1828)): the eastern subspecies ( Stenella longirostris orientalis Perrin, 1990) and the whitebelly hybrid. The data analyzed (n = 3138 eastern and 3099 whitebelly spinner dolphins) were collected between 1968 and 1994 from female dolphins incidentally killed in the yellowfin tuna ( Thunnus albacares (Bonnaterre, 1788)) purse-seine fishery that operates in the eastern tropical Pacific Ocean. Eastern spinner dolphins averaged 79.7 cm at birth, 121.5 cm at 1 year, and 171.5 cm at asymptotic length, and had a mean annual pregnancy rate of 0.351 and a calving interval of 2.84 years. Whitebelly spinner dolphins averaged 80.2 cm at birth, 122.5 cm at 1 year, and 177.1 cm at asymptotic length, and had a mean annual pregnancy rate of 0.329 and calving interval of 3.04 years. The mean age at attainment of sexual maturity was estimated to be 8.7 and 8.4 years for eastern and whitebelly spinner dolphins, respectively, which are 3.2 and 1.7 years older than those previously published. This difference indicates that the mean reproductive output during a female’s life is lower than previously expected and likely translates into lower population growth rates.

scholarly journals Purse-seine vessels as platforms for monitoring the population status of dolphin species in the eastern tropical Pacific Ocean

2016 ◽  
Vol 178 ◽  
pp. 101-113 ◽  
Author(s):  
Cleridy E. Lennert-Cody ◽  
Mark N. Maunder ◽  
Paul C. Fiedler ◽  
Mihoko Minami ◽  
Tim Gerrodette ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Tropical Pacific ◽  
Purse Seine ◽  
Tropical Pacific Ocean ◽  
Population Status ◽  
Eastern Tropical Pacific
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