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Dolphins and the Tuna Industry (1992) / Chapter Skim
Currently Skimming:

4 Biology and Ecology of Yellowfin Tuna
Pages 38-41

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 38...
... Discnminant analysis applied to morphometric data from yellowfin collected from a number of locations in the ETP indicate that fish sampled north of 15° N to 20° N differ from those collected south of this region (Schaefer, 1989~. Additional evidence for the existence of separate stocks within the ETP based on analysis of morphometric characters and gill raker counts is presented by IA'1TC (1989d)
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From page 39...
... Although the aging method has not been validated for fish smaller than 10 cm or larger than 100 cm, circumstantial evidence suggests that the technique produces reasonable age estimates across the entire size range encountered in the ETP (Wild, 1986~. Yellowfin reach fork lengths (the distance from the snout to the fork of the tail)
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From page 40...
... The size distribution of fish caught as school fish shows a slightly greater mode and a broader size range than those caught in association with floating objects, whereas yellowfin caught with dolphins are significantly larger, on average, than those caught by the other two methods. The spatial distribution of fishing effort also differs by fishing mode, season, and among years.
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From page 41...
... . (1 short ton = 0.907 metric ton.)
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Key Terms

  • size distribution
  • relative abundance
  • sets tend
  • eastern pacific
  • tuna varies

  • size range
  • sex ratio
  • dolphin sets
  • absolute abundance
  • reasonable age

  • entire size
  • yellowfin regulatory
  • declines dramatically
  • school fish
  • yellowfin caught

  • fish captured
  • recent decline
  • eastern regions
  • yellowfin occurs
  • recent levels

  • levels near
  • raker counts
  • mortality rate
  • cohort analysis
  • fishery declines

  • morphometric data
  • actual size
  • possibilities appear
  • yellowfin reach
  • sets occur


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