Food Selection by Grass Carp Fingerlings in a Vegetated Pond

Colle, Douglas E.; Shireman, Jerome V.; Rottmann, Roger W.

doi:10.1577/1548-8659(1978)107<149:fsbgcf>2.0.co;2

Cited by 31 publications

(24 citation statements)

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“…This was predicted by Edwards (1974) and also recorded by Edwards & Moore (1975) and Colle et al (1978a). In large bodies of water the pattern of browsing is apparently also modified by stratification of water temperatures and dissolved oxygen levels.…”

Section: Discussionsupporting

confidence: 68%

Control of water weeds by grass carp in two small lakes

Mitchell¹

1980

New Zealand Journal of Marine and Freshwater Research

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Chinese grass carp (Ctenopharyngodon idella Val.), 4-6 years old and weighing more than 2 kg, were incrementally stocked over a 3 year period at rates between 14 and 218 kg. ha -1 in two small lakes. Preferential consumption of plants was recorded at low stocking densities; the aquatic species Potamogeton ochreatus and the emergent species Eleocharis sphacelata were the most palatable plants in the two lakes. Virtual elimination of Potamogeton ochreatus, Eleocharis sphacelata, Egeria densa, and Nitella hookeri occurred at higher stocking densities of grass carp. The relatively low stocking densities required for results in these trials compared with those used in earlier trials in flowing water suggest that grass carp may exert some indirect form of weed control. The difficulties inherent in attaining 'optimum' levels of aquatic plant control using grass carp are discussed.

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Section: Discussionsupporting

confidence: 68%

Control of water weeds by grass carp in two small lakes

Mitchell¹

1980

New Zealand Journal of Marine and Freshwater Research

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“…Furthermore, macrophytes comprised 65% of the mean proportion by weight of the rudd diet during November when the water temperature was 14°C. Similar reductions in feeding intensity have been reported for the herbivorous grass carp Ctenopharyngodon idella (Valenciennes), which significantly reduces consumption at water temperatures below 14°C (Colle et al, 1978). Seasonal availability of macrophytes likely affected the diet composition of the rudds sampled in our study, but this was not tested.…”

Section: Discussionsupporting

confidence: 76%

Feeding patterns and population structure of an invasive cyprinid, the rudd Scardinius erythrophthalmus (Cypriniformes, Cyprinidae), in Buffalo Harbor (Lake Erie) and the upper Niagara River

2012

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Feeding patterns and population structure of the non-native rudd Scardinius erythrophthalmus (Linnaeus) were examined to understand their ecology in Buffalo Harbor and the Niagara River. We hypothesized that (1) the diet of rudds would be omnivorous, but contain greater proportions of macrophytes in summer months, (2) feeding intensity would increase with water temperature, and (3) condition and growth would be similar to other populations. We collected rudds with a variety of gears in 2009 to test these hypotheses, and used data from 2007 to 2010 seining surveys to determine if the relative abundance of young-of-the-year rudd differed among sites with different flow conditions. Rudds were mostly herbivorous; they consumed aquatic macrophytes in summer and supplemented their diet with algae and fish in spring and fall. Feeding intensity was positively correlated with water temperature, but significantly reduced during spawning. Rudd condition and growth were greater than estimates from other populations, suggesting increases in abundance and range expansion are possible. Furthermore, reproduction was successful at lotic sites but very poor at sites without measureable flow, contrary to the paradigm of optimal rudd habitat. Research is needed to understand how herbivory by abundant rudd populations affects native aquatic communities.

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“…Under better conditions, the conversion may take place even earlier, at 36-40 d (Sobolev, 1970). Colle et al (1978b) found that all fish (63-220 mm) containing food in their stomachs were strict herbivores. Only trace quantities ( < 0.1%) of animal matter were observed.…”

Section: Food Habits Consumption and Assimilationmentioning

confidence: 99%