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Last modified
7/14/2009 5:01:44 PM
Creation date
5/20/2009 9:27:44 AM
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UCREFRP
UCREFRP Catalog Number
7131
Author
Danyulite, G. P. and Y. M. Maksimov
Title
Characteristics of the optomotor reaction of fishes acted upon by a pulsed electric field
USFW Year
1974
USFW - Doc Type
Journal of Ichthyology
Copyright Material
YES
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<br />RESULTS <br />Endangered Species <br />Ptychocheilus Lucius - Colorado squawfish <br />YOY Ptychocheilus were found at Strata A, B, C, D, E, F, G, and K. <br />They ranged in length from 22 to 59 mm with a mean length of 39.8 mm. Fish <br />comprised 85.63% of their mean diet (9.952 mg present in 30.70% of the <br />fish). At Strata B, F, and G, the major food item was invertebrate remains; <br />at Stratum K, the lone Ptychocheilus ate only Diptera. Fish were not <br />consumed at Strata B, G, or K. Empty stomachs were found in 19.8% of the <br />Ptychocheilus. <br />Ptychocheilus consumed significantly more macrofragments at Stratum A <br />than at other strata. They consumed more invertebrate remains at Stratum B <br />than at other strata. The mean weight of Diptera consumed at Stratum K <br />was greater than that consumed at other strata. <br />Gila robusta - Roundtail Chub <br />YOY G. robusta were found at Strata VII, IX, and X. They ranged in <br />length from 25 to 54 mm with a mean length of 39.58 mm. Invertebrate <br />remains comprised 54.16% of their mean diet (7.036 mg present in 59.65% of <br />the fish). Ephemeroptera comprised 38.37% of their diet (4.984 mg present <br />in 28.07% of the fish). Empty stomachs were found in 7.02% of the YOY <br />G. robusta. <br />YOY G. robusta consumed significantly more Diptera at Stratum X than <br />at Stratum IX and more Trichoptera at Stratum V11 than at Strata X or IX. <br />Juvenile G. robusta were found at Strata VI, VII, and IX. They <br />ranged in length from 55 to 109 mm with a mean length of 71.61 mm.
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