Feeding habits of<i>Schizothorax oconnori</i>Lloyd, 1908 in the Yarlung Zangbo River, Tibet

S., B.; Xie, Congxin; Huo, Bin; Yang, Xue

doi:10.1111/jai.12283

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…As also seen in other fishes (Hovde et al 2002;La Mesa et al 2007;Ma et al 2014), the feeding intensity of G. firmispinatus generally followed a seasonal trend. Some studies found that the highest percentage of fish with empty guts occurred during the spawning season, which was attributed to a significant decrease in food ingestion during reproduction (Hovde et al 2002;Šantić et al 2009).…”

Section: Discussionsupporting

confidence: 74%

“…These shifts have also been reported for another species of the Schizothoracinae, Oxygymnocypris stewartii, small individuals of which fed mainly on Cobitidae and Hydropsychidae larvae, while larger individuals tended to consume Cyprinidae and Chironomidae larvae (Huo et al 2014). However, for some other Schizothoracinae fishes (such as Schizopygopsis younghusbandi and Schizothorax o'connori), which have a protruding under jaw with sharp horns and graze mainly on algae, no significant ontogenetic shifts in diets were found (Yang et al 2011;Ma et al 2014). Size-related variations in diet composition possibly reflect morphological and maturational changes, especially an increase in gape size (Graeb et al 2005;Huo et al 2014), improvements in locomotion (Beamish 1978) and sensory capabilities (Li et al 1985).…”

Section: Discussionsupporting

confidence: 53%

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Feeding habits of the cyprinid Gymnocypris firmispinatus in the Anning River, China

Wei

et al. 2020

Fish Sci

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The feeding habits and prey selection of Gymnocypris firmispinatus in the Anning River were investigated with respect to fish size, season and sex. Gut contents of 305 individuals ranging in size from 57 to 193 mm total length were analyzed, and 16.0% of the guts were found to be empty. The vacuity index indicated that the feeding intensity of the fish roughly followed a seasonal trend, with minimum food intake in winter. However, statistically insignificant variation in the vacuity index was observed between size classes and sexes. Overall, 46 prey taxa belonging to five orders (Ephemeroptera, Plecoptera, Trichoptera, Coleoptera and Diptera) were identified in the guts of 141 fish. G. firmispinatus fed almost exclusively on aquatic insects, of which Baetis sp. and Simulium sp. were the predominant prey species, followed by Diamesa sp. and Glossosoma sp. G. firmispinatus is a generalist feeder that relies upon a wide trophic spectrum. The multivariate analysis revealed that fish size was the principal factor affecting diet. Small individuals fed primarily on small ephemeropteran larvae and dipteran larvae, whereas larger individuals preferably consumed bigger trichopteran larvae. In terms of its prey, G. firmispinatus showed strong positive selection for dipteran larvae and trichopteran larvae, and negative selection for ephemeropteran larvae, plecopteran larvae and coleopteran larvae in all seasons. This study provides evidence that the observed diet of G. firmispinatus can be explained by prey selection rather than random feeding.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionsupporting

confidence: 53%

Feeding habits of the cyprinid Gymnocypris firmispinatus in the Anning River, China

Wei

et al. 2020

Fish Sci

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“…Most of them are widely recognized as being sensitive to a range of anthropogenic stressors and they are used in the bioassessment of rivers and streams (Atazadeh et al 2007;Sharifinia et al 2012b;Clews et al 2014;Ma et al 2014;Richardson et al 2014).…”

Section: Biotic Indicesmentioning

confidence: 99%

Benthic diatom and macroinvertebrate assemblages, a key for evaluation of river health and pollution in the Shahrood River, Iran

et al. 2015

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The present study analyzed the relationships of two different biological assemblages (diatom and macroinvertebrate) when they are used to characterize a set of stations (from reference stations to impacted stations) within the Shahrood River. In particular, we examined the issue of concordance among these assemblages and the physicochemical parameters detected, using both multivariate and multimetric methods. In addition, the trophic diatom index and Hilsenhoff family-level biotic index for macroinvertebrate assemblages were used to evaluate the ecological status of the Shahrood River. Diatom and macroinvertebrate assemblages in the Shahrood River differed significantly between reference and impacted stations. ANOSIM showed a significant difference in the composition and abundance of diatoms and macroinvertebrates among reference, influence and impact stations, especially between reference and impact stations. Results of CCA ordination showed that benthic diatoms and macroinvertebrate assemblages were mainly affected by DO, TSS, NO 3 -, PO 4 3-concentrations and heavy metals such as Zn and Cd. Biotic indices for the Shahrood River suggested a water quality category of ''fair'' with fairly substantial organic pollution for the impacted stations.Finally, our results suggest that an appropriate management and restoration policy needs to be implemented for the Shahrood basin.

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“…The diets of fish were closely related to the environmental characteristics of their habitat, which often varies with spatiotemporal changes (Saikia, 2015). The seasonal changes in fish feeding can be found in most fish species (La et al, 2007;Ma et al, 2014;2020). Compared with spring and winter, summer and autumn have higher water temperatures, faster digestion of prey items, and a shorter retention time of food in the stomach, resulting in higher vacuity rates in summer and autumn.…”

Section: Discussionmentioning

confidence: 99%

“…The stomach content analysis is a traditional method for studying fish feeding, and it is also the most direct and effective. It can accurately determine specific types of diet and is widely used in studies of fish feeding ecology (Yan et al, 2011;Huo et al, 2014;Ma et al, 2014;Sui et al, 2021;Sarker et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

The feeding habits of the Amur whitefish Coregonus ussuriensis in the Amur River, China

Wang,

Huo,

et al. 2023

Front. Environ. Sci.

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To study their feeding habits, Coregonus ussuriensis samples were collected seasonally in the Amur River, China. A total of 574 samples were collected, including 200 individuals with empty stomachs. The stomach contents of the remaining 374 samples were identified, counted, weighed, and analyzed. The results showed that the vacuity rate of Coregonus ussuriensis was 34.84% in total; the rates in summer and autumn were higher than in spring and winter. Prey items could be divided into three categories: fish, benthos, and mammals, with 62 taxonomic units. Of these, fish had the highest relative importance index (IRI), followed by benthos and mammals. Specifically, Exopalaemon modestus was the dominant species among the food species of Coregonus ussuriensis, and unidentified fish, Hydropsyche sp., Hemiculter leucisculus, Abbottina rivularis, and Saurogobio dabryi were important species. The average repletion index (RI, %) of Coregonus ussuriensis was highest in autumn (1.86), followed by winter (1.40), summer (1.26), and spring (1.02). The main food of Coregonus ussuriensis was benthos in spring and autumn, and fish in summer and winter. Cluster analysis showed that, according to the similarity level of the bait biological composition, the fork length group samples of Coregonus ussuriensis could be divided into three groups: 210–330 mm, 330–450 mm, and >450 mm. The highest IRI% of feed organisms in these three groups of samples were fish (73.67%), benthos (75.12%), and benthos (94.46%), respectively. It can be observed that with the growth of the fork length of Coregonus ussuriensis, the importance of benthos in its diet increases. The results of an RDA analysis on the relationship between main bait organisms and various factors indicated that season, river level, river width, and fish size have a significant impact on bait organisms and a positive or negative impact on the quality scores of some bait species. This study filled the gap in biological research on the feeding ecology of Coregonus ussuriensis and laid a research foundation for ecological research on this species and its resource protection and aquaculture.

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Feeding habits ofSchizothorax oconnoriLloyd, 1908 in the Yarlung Zangbo River, Tibet

Cited by 7 publications

References 24 publications

Feeding habits of the cyprinid Gymnocypris firmispinatus in the Anning River, China

Feeding habits of the cyprinid Gymnocypris firmispinatus in the Anning River, China

Benthic diatom and macroinvertebrate assemblages, a key for evaluation of river health and pollution in the Shahrood River, Iran

The feeding habits of the Amur whitefish Coregonus ussuriensis in the Amur River, China

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