New locality records for Balanus trigonus on the Florida and South American coasts are reported. Laboratory experiments indicate the species is relatively intolerant to both high and low temperatures, a fact which may restrict its geographic and littoral distribution. Specimens
grown on panels reproduce throughout the year, with maximum settlement in spring and fall. Some individuals only 3 weeks old reproduce, and probably there are many broods in 1 year. There is evidence the species can be self-fertilizing. Growth studies show the fastest growing specimens are
10 weeks or less in age, or 9 mm or less in size, and tend to grow near the surface rather than at deeper positions. Temperature may affect growth, but there is no direct correlation of increasing sea temperatures and growth.
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