Fish buyers Scott Twiss, left, and Sandy MacIver inspect crates of freshly caught cod at the Portland Fish Exchange before an auction. Scientists say it appears that the few cod left in the Gulf of Maine may be in a small area.

Fish buyer Scott Twiss inspects crates of fresh cod fish at the Portland Fish Exchange before Tuesday's auction. Fishermen say they are finding relatively large schools of cod while trying to catch other fish, such as pollock and hake.

Sandy MacIver, a fish buyer for Emerald Sea Food, inspects crates of cod at the Portland Fish Exchange before Tuesday's auction.

Fish buyer Scott Twiss inspects crates of cod at the Portland Fish Exchange on Tuesday.

Fish buyer Scott Twiss inspects crates of freshly caught cod Tuesday before an auction at the Portland Fish Exchange. Fishermen in Maine say landings in Portland and observations by fishermen indicate that scientists are using mathematical models that don’t reflect what’s going on in the ocean.