June

Sea surface temperatures fall from about 12°C. at the beginning of the month to 10°C. at the end of June. The volume of June samples is generally more than 130cc, and occasional tows may produce more than a litre of plankton mainly comprising a great abundance of Obelia geniculata medusae and Pleurobrachia pileus. Copepoda are now abundant and occasionally make a large contribution to the volume of plankton. June is the poorest month for larval Crustacea. The most common crustacean larvae are those of Squilla armata. Only nine decapod species occur and all of these are very poorly represented.