Skip to main content

Applying Fish Behavior to Reduce Trawl Bycatch: Evaluation of the Nested Cylinder Bycatch Reduction Device

Buy Article:

$28.00 plus tax (Refund Policy)



We used a laboratory flow chamber to examine the behavioral response of juvenile red snapper, Lutjanus campechanus, to hydraulic and illumination changes with the intention of exploiting these responses to devise a more effective bycatch reduction device (BRD). Snapper were observed to use slack water areas for flow refuge, and this refuging behavior increased the chance of the fish escaping from the flow chamber. Additionally, we observed that dark-adapted red snapper were more likely to exit the test chamber when the flow chamber was illuminated during nighttime hours. We also observed a significant effect of illumination intensity on the time required for red snapper to locate and exit the flow chamber. These behavioral observations were then used to design a BRD that was tested in the Gulf of Mexico shrimp trawl fishery on board a commercial fishing vessel. The Nested Cylinder Bycatch Reduction Device (NCBRD) employed flow blocking plates to encourage fish to move into an area of the trawl where they could more easily escape. The NCBRD reduced total fish bycatch by about 53% and retained 81% of shrimp. Modifications of the inner cylinder of the NCBRD provided higher shrimp retention rates (86.2%-96.6%) but lower bycatch reduction rates (37.2%-42.9%). Illumination of the NCBRD during field testing had no significant effect on total fish bycatch or shrimp retention. However, we found that red snapper bycatch was reduced by 50% when the NCBRD was illuminated. These results suggest that illumination may be effective for increasing the performance of a BRD’s ability to exclude red snapper and perhaps other species.

Keywords: Lutjanus campechanus; bycatch reduction; red snapper; shrimp trawling

Document Type: Research Article


Publication date: 2012-05-01

More about this publication?
  • The Marine Technology Society Journal is the flagship publication of the Marine Technology Society. It publishes the highest caliber, peer-reviewed papers on subjects of interest to the society: marine technology, ocean science, marine policy and education. The Journal is dedicated to publishing timely special issues on emerging ocean community concerns while also showcasing general interest and student-authored works.
  • Editorial Board
  • Submit a Paper
  • Subscribe to this Title
  • Membership Information
  • Information for Advertisers
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree 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