Skip to main content
padlock icon - secure page this page is secure

Free Content Studies on the Age and Growth of the Atlantic Sailfish, Istiophorus Americanus (Cuvier), Using Length-Frequency Curves

Download Article:
(PDF 664 kb)
Length frequencies of 8630 young to adult Atlantic sailfish, Istiophorus americanus, from southern Florida, the western Bahamas and the Gulf of Mexico were plotted by month for a three-year period. Growth is rapid during the apparently short life span, and fish hatched in June appear to reach a modal value of about 56 inches total length by November, at which time they weigh about seven pounds. At one year they have increased to 72 inches and an average weight of 21 pounds. By their second summer they are about 85 inches long and weigh about 43 pounds. The length increment drops off rapidly, and by their third year sailfish are about 92 inches long, with an average weight of 63 pounds. Interpretation beyond this point is difficult, but apparently few fish reach four years of age. There is great variation in weight for a given unit of length, particularly in the longer specimens. A 92-inch fish may weigh from 42 to 109 pounds, with an average weight of 63 pounds. An apparently high natural mortality in this species is reflected in the occurrence of only two major year classes in the sport fishery during any one month. During the winter months nearly half of the sport fishery is composed of six-month old fish. The conservation value of a Florida law that now prohibits the possession of more than two sailfish is questioned. It is suggested that tagging experiments now in progress be intensified during the winter months and that these be confined largely to the smaller specimens.

6 References.

No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: January 1, 1957

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more