Spawning, movement and population structure of flannelmouth sucker in the Paria River
AuthorWeiss, Steven Joseph, 1958-
AdvisorMaughan, O. Eugene
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractSpawning flannelmouth sucker, Catostomus latipinnis, in the Paria River averaged 478 mm (n = 246) total length (TL). This was 53 mm longer (p < 0.001) than the mean length of spawning fish taken from this same location in 1981 (425 mm, TL, n = 286). Sub adult flannelmouth were common in the Paria in 1981 but no post-larval fish < 379 mm, TL were caught in 1992 or 1993. There is no evidence that juvenile flannelmouth have reared in the Paria River/Glen Canyon Area in the last 12 years. However, some adult fish appear to enter the population from downstream locations. In 1992 and 1993, spawning occurred throughout the lower 10 kilometers of the Paria. Young-of-year were seen in 1992 but could not be found shortly after hatching. No young-of-year were seen in 1993. Growth of adult sized fish is very slow. Based on extrapolations from recaptures, longevity may approach 30 years. Recaptures from fish marked in other studies were originally tagged as far as 229 km downstream from the mouth of the Paria.
Degree ProgramGraduate College
Renewable Natural Resources