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SICKLEFIN CHUB (MACRHYBOPSIS Meekl), STURGEON CHUB (M

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SICKLEFIN CHUB (MACRHYBOPSIS Meekl), STURGEON CHUB (M University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Transactions of the Nebraska Academy of Sciences and Affiliated Societies Nebraska Academy of Sciences 1994 THE STATUS OF NEBRASKA FISHES IN THE MISSOURI RIVER, 5. SELECTED CHUBS AND MINNOWS (CYPRINIDAE): SICKLEFIN CHUB (MACRHYBOPSIS MEEKl), STURGEON CHUB (M. GEUDA), SILVER CHUB (M. STORERIANA), SPECKLED CHUB (M. AESTIVAUS), FLATHEAD CHUB (PLATYGOBIO GRACILIS), PLAINS MINNOW (HYBOGNATHUS PLACITUS), AND WESTERN SILVERY MINNOW (H. ARGYRITIS) Larry W. Hesse Nebraska Game and Parks Commission Follow this and additional works at: https://digitalcommons.unl.edu/tnas Part of the Life Sciences Commons Hesse, Larry W., "THE STATUS OF NEBRASKA FISHES IN THE MISSOURI RIVER, 5. SELECTED CHUBS AND MINNOWS (CYPRINIDAE): SICKLEFIN CHUB (MACRHYBOPSIS MEEKl), STURGEON CHUB (M. GEUDA), SILVER CHUB (M. STORERIANA), SPECKLED CHUB (M. AESTIVAUS), FLATHEAD CHUB (PLATYGOBIO GRACILIS), PLAINS MINNOW (HYBOGNATHUS PLACITUS), AND WESTERN SILVERY MINNOW (H. ARGYRITIS)" (1994). Transactions of the Nebraska Academy of Sciences and Affiliated Societies. 101. https://digitalcommons.unl.edu/tnas/101 This Article is brought to you for free and open access by the Nebraska Academy of Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Transactions of the Nebraska Academy of Sciences and Affiliated Societiesy b an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. 1994. Transactions of the Nebraska Academy of Sciences, 21: 99-108 THE STATUS OF NEBRASKA FISHES IN THE MISSOURI RIVER, 5. SELECTED CHUBS AND MINNOWS (CYPRINIDAE): SICKLEFIN CHUB (MACRHYBOPSIS MEEKl), STURGEON CHUB (M. GEUDA), SILVER CHUB (M. STORERIANA), SPECKLED CHUB (M. AESTIVAUS), FLATHEAD CHUB (PLATYGOBIO GRACILIS), PLAINS MINNOW (HYBOGNATHUS PLACITUS), AND WESTERN SILVERY MINNOW (JI. ARGYRITIS) Larry W. Hesse Nebraska Game and Parks Commission Box 934, Norfolk, Nebraska 68702 Federal Aid in Sport Fish Restoration, Dingell-Johnson Project, F-75-R-ll December 1993. Publication funded by Nebraska Game and Parks Commission. ABSTRACT Sicklefin chub life history (Macrhybopsis meeki) The earliest collection of sicklefin chubs was made Seven species of native Missouri River cyprinids have by Meek (1892) from the Missouri River near Sioux been reduced in abundance by 70 to 98%. Several have been City, Iowa. Subsequently they were again collected by extirpated from the reach upstream from Gavins Point Dam. Johnson (1942) from the Missouri Rivet and Morris The reasons for the decline are most likely the alteration of sediment dynamics due to dam construction, the elimination (1960) from the Platte River. Although there is the ofbankful discharge, and the elimination of critical habitats, possibility that these were misidentified (personal com­ such as sandbars and off-channel areas. munication, Dr. Richard Stasiak, Professor, University of Nebraska at Omaha). Cross (1967) suggested that t t t this species seemed so specialized for life in the large, silt-laden Missouri and lower Mississippi rivers that The minnow family is large, with more than 40 their survival might be threatened by impoundments species occurring as natives in the Missouri River Ba­ and other modifications of habitat. Harlan and Speaker sin; more than 30 species are native to Nebraska, and (1987) indicated that sicklefin chubs were rare at all at least 21 can be found associated with the Missouri sites, and their occurrence was restricted to the Mis­ River main channel on Nebraska's border (Eddy and souri River, where they have been collected in Woodbury, Underhill, 1980; Hesse et aI., 1989; Stasiak 1987). Na­ Harrison, Pottawatamie, Mills and Fremont counties tive Nebraska minnows are more commonly found in in Iowa. Bailey and Allum (1962) raised concern for streams than in lakes, and before the streams of the this species in South Dakota because of the reduction state were altered they may have been more numerous in turbidity associated with impoundment. Pflieger than any other fishes (Jones, 1963). Species with simi­ and Grace (1987) determined that the species was more lar habits tended to be found together in guilds. Min­ numerous in the lower Missouri River in Missouri in nows are adapted to be carnivorous, herbivorous or recent collections compared to two earlier periods (1940- detritovorous, and they served an important role in the 45 and 1962-72). However, their presence was restricted transfer of solar energy up the trophic ladder in the to the lowermost reaches of the Missouri River near the Missouri River ecosystem (Fig. 1). confluence with the Mississippi River. The historical range of the species was the mainstem of the Missouri This paper presents the results of sampling effort River from Montana downstream to the Mississippi carried out during the period of 1971-1993 to show the River, and down the Mississippi River to the Gulf. population trend for seven native cyprinids of the Mis­ Their range has been disjointed due to dam construc­ souri River in Nebraska. Some time will be allocated to tion. With the exception of small extant populations in a description of the future management requirements Montana and in Missouri, they are now so rare that for these species. they may be in danger of extinction (Carter, 1983; Guillory, 1979; Werdon, 1993a). 99 100 L. W. Hesse ,..-_-+----=""""" Fort Peck (Fort Peck Dam) (RK 2.851) Oahe (Oahe Dam) (RK 1,725) Sharpe (Big Bend Dam) (RK 1,588) Francis Case (Fort Randall Dam) (RK 1,416) Yankton (RK 1,295) Lewis and Clark (Gavins Point Damt (RK 1,305) lown City (RK 1,178) \. \; ~. -e,i.,. Figure 1. Map of the Missouri River showing the lowermost dams and unchannelized and channelized segments. The sicklefin chub was very specialized for life in a collected in the lower than upper Missouri River within large and turbid river. The animal's eyes are partially the state of Missouri (Pflieger and Grace, 1987). Cross covered by skin and reduced in size to limit abrasion. It (1967) found this species only in the Kansas, lower favors sandy bottoms in moderate current. It has taste Smoky Hill and Missouri rivers. Those collected in the buds on the outside of its head as well as numerous Kansas River were commonly found where the water taste organs in its mouth, which are used to sort food was very shallow and the velocity high, which kept fine from bottom soils (Pflieger, 1975). They most likely sediments from accumulating. Stewart (1980) noted feed on aquatic insect larvae, and detritus consumed that sturgeon chubs were found only in gravel deposits with them (Reigh and Elsen, 1979). The animal is in the Powder River in Wyoming, and that they did not thought to breed in the spring (Pflieger, 1975). ascend the Powder above the Salt Creek, a source of high turbidity. As in the case of the sicklefin chub, Sturgeon chub life history sturgeon chubs have highly developed cutaneous sense (Macrhybopsis gelida) organs extending over the entire head and onto the fins Sturgeon chubs were found in the Platte River in (Moore, 1950). Cross (1967) described this species to be Nebraska by Everman and Cox (1896). Johnson (1942) highly adapted to life in large turbid rivers. The fish found them in Bazile Creek near the Missouri River has a depressed head and slender body somewhat confluence, as well as throughout the Platte, Republi­ wedge-shaped and tapering tailward, all of which pro­ can, Missouri and lower Elkhorn rivers. Bailey and vides minimal resistance to flow and makes use of the Allum (1962) defined the difference in distribution of current to hold the fish on the bottom. The small eyes sturgeon and sicklefin chubs. The former replaced the are somewhat shielded against abrasion. Moreover it latter in the upper Missouri River Basin; they were co­ has epidermal keels on scales above the lateral line inhabitants of the middle Missouri and were replaced which may aid in the smooth dissipation of flow across by sicklefin chubs in the lower Missouri. They are not its body (Cross, 1967). It is mostly carnivorous, con­ known to ascend either the Ohio or Mississippi rivers suming aquatic insect larvae (Reigh and Elsen, 1979; above the confluence with the Missouri River. Their Stewart, 1980). Stewart (1980) reported the onset of range may be explained by their penchant for strong spawning in sturgeon chubs during early June in the current over gravel rather than sand-silt. However, in Powder River. The historical range of the sturgeon recent collections in Missouri more sturgeon chubs were chub has been much reduced to such an extent that it Chubs and minnows in the Missouri River 101 may be in imminent danger of extinction (Guillory, Pflieger, 1975). 1979; Rowe, 1992; Stasiak, 1990; Werdon 1993b). Like other native chubs, it has a well developed Silver chub life history external sensory system and unlike silver chubs must (Macrhybopsis storeriana) rely on these olfactory senses to feed. It feeds on Silver chubs have been reported to occur in the aquatic insect larvae, crustaceans, and plant material lower reaches ofthe Platte, Loup, Elkhorn, and Repub­ (Pflieger, 1975). It is known to spawn during a pro­ lican rivers as well as throughout the Missouri River in tracted period from early May to late August, and eggs Nebraska (Jones, 1963). Pflieger (1975) called it one of are semi-buoyant (Botrell et al., 1964). The animal is the common and characteristic minnows of the Mis­ very short-lived « 2 years). souri and Mississippi rivers. Cross (1967) found it in the Kansas, Blue, Smoky Hill, Neosho, and Arkansas The status ofthe species within its range is not well rivers, though it was only numerous in the Missouri defined, but Pflieger and Grace (1987) indicated that it River. Bailey and Allum (1962) indicated that the increased in abundance from 1940-45 to 1978-83 in upstream limit of silver chubs was Lewis and Clark Missouri's portion of the Missouri River.
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