DURHAM, New Hampshire (AP) — Scientists at the University of New Hampshire say new research shows that ventless lobster traps can be more effective for monitoring the crustaceans than standard traps.

Ventless lobster traps differ from other traps in that they have blocked escape vents. Biologists often use traps to study lobster populations. The university says research published in the journal Fisheries Research shows that scientists found evidence that ventless traps are better predictors of the size of lobster populations.

Zoology professor and study co-author Win Watson says researchers can catch 10 times more lobsters per trip with ventless traps.

Vents in standard lobster traps are designed to allow sub-legal sized lobsters to escape before they are harvested by commercial fishermen.