Skip to main content

Free Content Age at Migration from the Sea of Juvenile Galaxias in New Zealand (Pisces: Galaxiidae)

Download Article:
 Download
(PDF 1453.419921875 kb)
 
Daily growth rings begin to form in the otoliths of juvenile galaxiids several days before they hatch. These rings show that life at sea lasts for 103–202 days in Galaxias maculatus (N = 99), 93–128 days in G. fasciatus (N = 44), 110–155 days in G. brevipinnis (N = 70), 113–137 days in G. argenteus (N = 10), and 120–136 days in G. postvectis (N = 5). Return to fresh water takes place in the spring following spawning the previous autumn–winter. The peak spawning period for G. maculatus, G. fasciatus, and G. brevipinnis appears to be during April to mid May, and perhaps to mid-June in G. postvectis and G. argenteus (though data for the last two species are meager). The tendency for fish to be smaller at migration towards the end of the migration period is associated with their return to fresh water at a younger age (rather than being caused by slower growth). The semelparous, largely annual life cycle of G. maculatus, with its high relative fecundity, small eggs and larvae, is compared with the iteroparous, perennial life cycle of the other species, with lower relative fecundity, and larger eggs and larvae.

13 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1994-03-01

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
X
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