. The Canadian field-naturalist. 1989 Dalton: Status of the Hornyhead Chub 183. Figure 4. Collection records of Nocomis biguttatus in Ontario: â² National Museum of Natural Sciences; â Royal Ontario Museum; ⢠Ontario Ministry of Natural Resources. In Manitoba, the species is common to abundant in the Whitemouth River and common in the Brokenhead River (K. W. Stewart, personal communication). Habitat Hornyhead Chub are usually found in slow moving, small to medium-sized streams, most often tributary to large rivers (Lachner 1952; Scott and Grossman 1973; Jenkins and Lachner 1980). Ample curren
. The Canadian field-naturalist. 1989 Dalton: Status of the Hornyhead Chub 183. Figure 4. Collection records of Nocomis biguttatus in Ontario: â² National Museum of Natural Sciences; â Royal Ontario Museum; ⢠Ontario Ministry of Natural Resources. In Manitoba, the species is common to abundant in the Whitemouth River and common in the Brokenhead River (K. W. Stewart, personal communication). Habitat Hornyhead Chub are usually found in slow moving, small to medium-sized streams, most often tributary to large rivers (Lachner 1952; Scott and Grossman 1973; Jenkins and Lachner 1980). Ample current to keep the bottom clear of mud, silt and sand is probably required (Lachner and Jenkins 1967). Streams with shifting sand and silt are not favoured by Hornyhead Chub (Greene 1935: 75 in Lachner 1952). Water temperatures vary from cool to warm, and water clarity is usually good (Jenkins and Lachner 1980; Scott and Crossman 1973). Bottom substrates range from gravel to boulders. Larger chub are often found in pools and slower portions of creeks and rivers among large rocks and boulders, while the smaller, younger fish prefer beds of smaller stones and weedbeds of rooted aquatic plants (Lachner 1952; Scott and Crossman 1973; Jenkins and Lachner 1980). Gravelly, rocky river bottoms provide much of the invertebrate fauna required by all members of the species for food. The gravel supplies materials required for nest construction by mature male chub (Lachner and Jenkins 1967). General Biology Although Hornyhead Chub are omnivores, different food types are favoured in different stages of their life. The diet of young fish consists mostly of plant material but diatoms, cladocerans and aquatic insect larvae are also eaten (Scott and Crossman 1973). Progressively larger foods are eaten and the importance of aquatic flora is reduced as the fish grow (Scott and Crossman 1973). Larger insect larvae, annelids, crayfish, fish, and especially snails become increasingly important (Scott
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