Free Content Variation in Natural Mortality: Implications for Queen Conch Stock Enhancement

 Download
(PDF 81kb)
 
Download Article:

Abstract:

Our long-term investigations of mortality and predation in the large, economically significant gastropod Strombus gigas (queen conch) indicate that instantaneous rates of natural mortality (M) in nursery grounds in the Bahamas and the Florida Keys are often higher and more variable than recognized earlier. Wide divergence from a simple size-specific curve of natural mortality was caused by seasonal, interannual, and site-specific sources of variation. In the Florida Keys, mortality rates for 200-mm conch were highest in summer and most stable in the fall, but summer values of M varied interannually from <2.0 to 12.0. Mortality rates for 100-mm conch, often considered ideal in size for field releases, varied from 0.5 to 12.0, depending on site, season, conch density, and deficits in behavior and shell form associated with hatchery rearing. Unlike many marine invertebrates, juvenile queen conch have an inverse density dependence in mortality. Because of the logarithmic relationship between mortality rate and the cost to enhance a stock, it is critical for those involved in stock enhancement to have a realistic understanding of mortality processes and effects and to optimize culture and release strategies for highest possible survival. Specific recommendations are made for queen conch releases.

Document Type: Research Article

Publication date: March 1, 1998

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
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect 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