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Reproduction and growth of the pahrump pool fish empetrichthys latos latos miller in the laboratory and nature

Reproduction and growth of the pahrump pool fish empetrichthys latos latos miller in the laboratory and nature

Journal of Aquariculture & Aquatic Sciences 5(1): 1-5

The Pahrump poolfish Empetrichthys latos latos Miller, an endangered species, was cultured in the laboratory. Length was measured at 14 day intervals for 112 days. The results indicate an average length at hatching of 6.2 mm with a range of from 5-7 mm, an average length at 112 days of 21.1 mm with a range of from 14-29 mm and a relatively even growth rate over the test period. Length of the control group at 28 days was significantly larger than any of the experimental groups. Experimental results therefore were significantly influenced by the experimental procedures. Larger females in the laboratory and in the natural population in Manse Spring produced more eggs than did smaller females. The population in Manse Spring developed enlarged ovaries from February through July with an apparent peak in April. The Pahrump poolfish (Empetrichthys latos latos Miller) was extirpated from the type locality at Manse Spring, Pahrump Valley, Nevada [USA] in 1975 (Deacon, 1979; Soltz and Naiman, 1978). The species presently exists as introduced populations in Corn Creek Springs on the Desert Game Range, in a reservoir at Spring Mountain Ranch State Park, both in Clark County, Nevada, and Shoshone POnds, White Pine County, Nevada. With the exception of irregularly conducted management activities, this species has been the subject of very little investigation (Deacon, 1979; Deacon et al., 1964; Miller, 1948; Parenti, 1981; Selby, 1977; United States Department of the Interior, 1980). Population status at all three transplant sites has recently been documented in unpublished reports to the Nevada Department of Wildlife by Deacon (1983, 1984) and Baugh, Pedretti and Deacon (1985). The present study provides information on spawning season and fecundity of the natural population in Manse Spring as well as on hatching success and growth rate of E. l. latos in the laboratory. The information may be useful in interpretation of length-frequency data from the three transplant sites.

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Accession: 006315451

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