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Last modified
7/14/2009 5:02:37 PM
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UCREFRP
UCREFRP Catalog Number
9647
Author
Wydoski, R. S.
Title
Fish Population Manipulation.
USFW Year
1990.
USFW - Doc Type
Denver.
Copyright Material
NO
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subspecies of rainbow trout (Salmo gairdnerii aquilarum) in Eagle Lake, <br />California. Control of the chubs in this lake are considered to be <br />undesirable (Burns, 1966). The Lahonton cutthroat trout that originated in <br />Pyramid Lake, Nevada is also known to prey on tui chubs and the chub is not a <br />problem fish in this body of water. In the intermountain and western states, <br />the tui chub, Utah chub (Gila atraria), and other minnows might be controlled <br />effectively with a salmonid predator such as the Eagle Lake rainbow or <br />Lahonton cutthroat. <br />The possibility of using sterile hybrid fish to manage or control <br />overpopulation and stunting has not been explored sufficiently to be wholely <br />predictable. However, work such as that of Childers and Bennett (1961) shows <br />promise for this type of management. These investigators crossed various <br />sunfishes: bluegill (B), green sunfish (G), and redear sunfish (R). Some of <br />their findings were: (1) of six fl hybrids produced, only the GR hybrids <br />exhibited an approximate 50:50 sex ratio. Of the RG and GM Hybrids, 70 <br />percent were males; of the BG and BR hybrids, 97 percent were males, and of <br />the RB hybrids, 100 percent were males. Confusus might say that it is rather <br />difficult to have a pond become overpopulated if it had been planted with fish <br />of one sex. (2) When placed in ponds containing no other fish, the RG F1 and <br />the GB fl, hybrids produced large numbers of F2 hybrids; the GR fl hybrids <br />produced only a few F2 hybrids. The BG, BR, and RB hybrids failed to provide <br />an F2 generation. Recently, the use of tiger muskies (northern pike and <br />muskellunge crosses) and wipers (white bass and striped bass) have proven to <br />be very effective in producing excellent sport fisheries. These hybrid <br />predators have effectively used abundant forage species but since their <br />numbers can be controlled by stocking, they do not deplete the forage fish <br />populations. Monosex channel catfish can be used in pond management but used <br />in large waters is economically prohibitive (Redner, et.al., 1983). The use <br />of chemicals and heat have been used to produce monosex salmonids (Donaldson <br />and Hunter 1982; Rohrer and Thorgaard 1986). Recent research provides promise <br />on controlling the reproduction of stocked fish by genetic manipulation <br />gynogenesis sex inversion and tetrapl-oidy that may be practical in hatcheries <br />(Shelton 1986). <br />Use of Regulations and Publicity to Control or Utilize Fish Populations <br />Liberalized angling regulations for undesirable species is employed in many <br />states at the present time. However, without an information and education <br />program to attract people to utilize such fish, these species are not <br />harvested to the point where control is effected. Even with the introduction <br />of harvest methods such as bow and arrow hunting and inland spearfishing, not <br />many people are attracted to harvest undesirable species. <br />Several agencies have initiated programs to encourage the utilization of less <br />desirable fishes for food and sport (Miller, 1972; Sigler, 1958; Wendler, <br />1967). Others have pointed out the potential for commercial fishing (Van <br />Meter, 1973). Miller (1972) offers suggestions on how to fish for carp, when- <br />to fish for them, baits that are effective, and tips on dressing and cooking <br />carp. Miller states "These hardy fish are gallant fighters and make mighty <br />good eating besides. They battle as well or better than many of the more <br />sought after game fish. The carp offers great potential for exciting sport <br />and interesting eating. So catch carp, its fun! Eat carp, its good!" <br />9
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