Journal
FISHERY BULLETIN
Volume 117, Issue 3, Pages 211-219Publisher
NATL MARINE FISHERIES SERVICE SCIENTIFIC PUBL OFFICE
DOI: 10.7755/FB.117.3.8
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Funding
- St. Joseph's College
- New Hampshire Sea Grant (NOAA award R/SSS-3)
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Ventless lobster traps are now widely used to assess the abundance of American lobsters (Homarus americanus). However, catch in ventless traps plateaus after 24 h (trap saturation), possibly influencing abundance estimates. This study addressed 3 mechanisms that may cause ventless trap saturation: 1) traps retain so many lobsters that, over time, fewer lobsters are available to catch; 2) as lobsters accumulate in traps, they inhibit entry of additional lobsters and; 3) bait quality deteriorates over time and loses its attractiveness. We found that 1) the number of lobsters in the vicinity of traps did not change after a 24-h soak; 2) stocking traps with lobsters before deployment lowered subsequent catch, while removing the lobsters captured after 24 h led to an increase in catch after 48 h; 3) when fresh bait was added to traps that had been fished for 24 h, entry rate immediately increased; 4) if old bait was used, catch after 24 h was less than in traps fished with fresh bait; and 5) amino acid attractants in bait declined after the first 6-24 h. Thus, ventless traps appear to saturate due to a combination of loss of bait attractiveness and the interactions between lobsters as they accumulate in traps.
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