PORTLAND, Maine — There’s an effort underway to bring New England shrimp back to seafood customers — but fishermen have found few of the crustaceans, and the fishing industry that harvests them may face an even longer shutdown.

Fishermen have been under a moratorium on catching shrimp for more than a decade because of low population levels that scientists have attributed to climate change and warming oceans. The harvesters were allowed to catch a small number of shrimp this past winter as part of an industry-funded sampling and data collection program.

The fishermen didn’t catch much though, and recent changes allow regulators to extend the moratorium for five years at a time instead of just one, Atlantic States Marine Fisheries Commission officials said Monday.

Regulators will meet in

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