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<br />nO ._...; .. -" -";~-~.lJf~' "'f"Pl~''?f;'~'M.:..i.''''''''''Ji~'';;''''~'''_''~'''>'"'-'~''-'''::~'.",.: r_:':'~- ~~rrw''I'I;t~.....
<br />
<br />,., _tafa
<br />
<br />; the time
<br />leD taken
<br />Slide and
<br />1!81' River,
<br />lliversity) .
<br />
<br />'antosteus
<br />eD, rather
<br />DlOuntain
<br />eeparated
<br />J8 usually
<br />90 to 100
<br />gill rakers
<br />18; 6. total
<br />, 44 to 46
<br />l~inches
<br />~ margin
<br />
<br />from other
<br />t posterior
<br />the lighter
<br />the sides
<br />I!S and the
<br />edges are
<br />I froDi the
<br />! and dead
<br />aides, and
<br />owish, the
<br />. the scale
<br />I posterior
<br />:in surface
<br />
<br />maximum
<br />iaht of one
<br />
<br />:0 be most
<br />IOUS8nds of
<br />t lIowly up
<br />true sucker
<br />
<br />I
<br />
<br />lUe faistories
<br />
<br />\
<br />I
<br />I:
<br />l
<br />
<br />fashion. When feeding, small detachments occasionally separate
<br />from the main school, and moving along slowly and cautiously, the
<br />different individuals lazily roll about on the bottom, scraping food
<br />from the surface of the rocks. They are, however, very nervous and
<br />cautious fishes, fleeing at the approach of a shadow, or the jar
<br />of the gravel crunched beneath the observer's feet. Panic seizes an
<br />individual suddenly parted from a school although groups of widely
<br />separated and perfectly quiet fishes may at times be seen.
<br />"In Weber River they appear to greatly outnumber the other
<br />large fishes. Catostomus ardens associates with this species, and its
<br />individuals may be recognized by their more robust, greenish and
<br />bronzy bodies, and pink fins. One haul of the collecting seine took
<br />758 fish from a large school without visibly reducing its size. Among
<br />the Pantosteus were 50 examples of Catostomus. Other catches
<br />seemed to support this proportion."
<br />Snyder indicated that this species is not associated with the
<br />mountain sucker, but juveniles may be taken in the same net haul
<br />as platyrhynchus-for example, in Bear River at Evanston, Wy-
<br />oming (one green sucker, six mountain suckers), and in the same
<br />river between Grace and Preston, Idaho (one green sucker, three
<br />mountain suckers).
<br />The food of this species is probably much like that of the
<br />bluehead sucker (Pantosteus delphinus) which has similar feeding
<br />habits; both eat algae and slime off the rocks as well as a few
<br />aquatic insect larvae.
<br />
<br />1\
<br />
<br />I,
<br />
<br />1
<br />~
<br />,
<br />
<br />Habitat
<br />
<br />This sucker occurs in the more meandering parts of rivers,
<br />thriving well where the channel is broad and the water deep (Snyder,
<br />1924). The bottom consists commonly of gravel, stones and boulders
<br />or bedrock, with some mud and sand in the pools. It is not known
<br />to occur in creeks, where its relative, P. platyrhyndws, is more
<br />common. .
<br />
<br />II
<br />
<br />IUTIKPBACK SUCKER
<br />
<br />Xyrauchen texanus (Abbott)
<br />
<br />Common Names: Humpback sucker, razorback sucker, buffalo.
<br />
<br />Importance
<br />This species may be taken on hook and line but apparently
<br />
<br />JOG
<br />
<br />~
<br />
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