. Bulletin. Science; Natural history; Natural history. RESEARCH NOTES 59. Fig. 3. Acanthogobius flavimanus, collected in Long Beach Harbor. Standard length is 156 mm. Discussion The occurrence of numerous mature and spawning adults is evidence that an established population of T. trigonocephalus exists in Los Angeles Harbor. The presence of small, probably locally spawned, A. flavimanus can be taken as evidence that it is established in Newport Bay. An observation in Los Angeles Harbor and a collection of yellowfin gobies in Long Beach Harbor waters and the San Gabriel River are strong evidenc
. Bulletin. Science; Natural history; Natural history. RESEARCH NOTES 59. Fig. 3. Acanthogobius flavimanus, collected in Long Beach Harbor. Standard length is 156 mm. Discussion The occurrence of numerous mature and spawning adults is evidence that an established population of T. trigonocephalus exists in Los Angeles Harbor. The presence of small, probably locally spawned, A. flavimanus can be taken as evidence that it is established in Newport Bay. An observation in Los Angeles Harbor and a collection of yellowfin gobies in Long Beach Harbor waters and the San Gabriel River are strong evidence that this goby is established and may be expanding its range in southern California. Because of the nature of international shipping, there is little doubt that the Los Angeles-Long Beach Harbors are the locations of introductions of both gobies into southern California. There is no regular international shipping into Newport Bay or the San Gabriel River. The fact that these gobies only occur extralimitally in widespread Pacific port cities and vicinities would also seem to implicate shipping. The actual method of introduction is unknown, but suggested mechanisms gen- erally involve the transport of eggs on fouling organisms growing on the hulls, or in the seawater systems of ships (Brittan et al., 1963; Hubbs and Prescott in Hubbs and Miller, 1965; Dawson, 1973; Hoese, 1973). Another mechanism, that of egg transport on oysters, would not be applicable to Los Angeles-Long Beach Harbors, as no oysters have been introduced there. Dawson (1973) estimated that minimum ship transit time from Yokohama, Ja- pan to San Francisco was eight days in 1972. The average incubation time of eggs of T. trigonocephalus is days at 20°C (Dotu, 1958), while that of A. flavimanus is about 28 days at 13°C (Dotu and Mito, 1955). Therefore, it is possible that eggs of both gobies could be laid on fouling organisms of ships hulls in the Orient, and be transported to the west coast of the United
Size: 3682px × 679px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
