. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. OCCURRENCE OF THE NEMATODE, PHILOMETRA AMERICANA, IN THE ENGLISH SOLE, PAROPHRYS VETULUS, IN SAN FRANCISCO BAY Several species of nematodes belonging to the genus Philometra occur in the body cavities and tissues of freshwater and marine fishes in North America. The nematode P. americana was first described by Kuitunen-Ekbaum (1933) from a starry flounder, Platichthys stellatus, collected at Departure Bay, Vancouver Island. He also ob
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. OCCURRENCE OF THE NEMATODE, PHILOMETRA AMERICANA, IN THE ENGLISH SOLE, PAROPHRYS VETULUS, IN SAN FRANCISCO BAY Several species of nematodes belonging to the genus Philometra occur in the body cavities and tissues of freshwater and marine fishes in North America. The nematode P. americana was first described by Kuitunen-Ekbaum (1933) from a starry flounder, Platichthys stellatus, collected at Departure Bay, Vancouver Island. He also observed this nematode in the rock sole, Lepidopsetta hilineata, the black prickleback, Xiphister atropurpureus, the saddleback gunnel, Pholis ornatus, and the northern clingfish, Gohiesox meandricus. This is the first reported occurrence of P. americana in the English sole, Parophrys vetulus. Infections were found in 9 of 359 juvenile sole (80-120 mm) collected by otter trawl in 40 to 50 ft of water on the west side of Treasure Island in February 1966. One of 250 juvenile fish collected in this area in November 1966 was found infected. During December 1966, we collected 500 juvenile English sole on the east side of Treasure Island in 40 to 50 ft of water. One was infected. The number of worms ranged from 1 to 22 per fish and characteristically they were located under the skin at the bases of fins. In all cases, the nematodes were blood red females, but only those collected in November contained live embryos in the uterus. In no case was a male worm found. Although the complete life cycle of these parasites is not known, it is believed to involve a planktonic intermediate host, possibly a eopepod. Kuitunen-Ekbaum (1933) suggested that the female worm. FIGURE 1—The immature nematodes are barely visible at the base of the dorsal fin. (327). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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