In Gloucester, Mass., America’s oldest seaport, few new boats have entered the commercial fishing business in decades, and few young people are entering the profession. The trend — driven by a number of factors — is the same around the country.

In Gloucester, Mass., America’s oldest seaport, few new boats have entered the commercial fishing business in decades, and few young people are entering the profession. The trend — driven by a number of factors — is the same around the country.