Integrating stomach content and stable isotope analyses to elucidate the feeding habits of non-native sharptooth catfish Clarias gariepinus

Kadye, Wilbert T.; Booth, Anthony J.

doi:10.1007/s10530-011-0116-6

Cited by 57 publications

(44 citation statements)

References 61 publications

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“…2a, b) but all currently comprise of low production values according to FAO figures. Literature also suggests negative ecological impacts can still accrue from these species in some countries, including Brazil (Townsend and Winterbourn 2003;Cambray 2005;Milli and Teixiera 2006;Vitule et al 2006;Kadye and Booth 2011). Given the consequences of Asian carp invasions in areas of the USA (e.g.…”

Section: Freshwater Fish and Non-native Fish Aquaculture Production Amentioning

confidence: 99%

Non-native fish in aquaculture and sport fishing in Brazil: economic benefits versus risks to fish diversity in the upper River Paraná Basin

Britton

Órsi

2012

Rev Fish Biol Fisheries

117

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Brazil has a highly diverse freshwater fish fauna and their freshwaters provide valuable provisioning ecosystem services in aquaculture and sport angling, especially in the developed regions in the south. Non-native fish now comprise a substantial proportion of the total aquaculture production and value, contributing at least $US 250 million in 2008 (63% of the total value of freshwater fish aquaculture) according to the Fish and Agriculture Organisation. Much of this aquaculture activity is centred in Central and Southern Brazil, such as impounded sections of the upper River Paraná. The non-native fishes used tend to feed at relatively low trophic levels, with the most prominently species being Cyprinus carpio and Oreochromis niloticus. Ecological risk assessment suggests these species are potentially highly invasive and deleterious to the native fish diversity of invaded water bodies. Fishes introduced for the creation of sport fisheries tend feed higher trophic levels through piscivory, such as the peacock basses (Cichla species) from Amazonia. Their introductions have generally resulted in establishment and invasion, which tends to be followed by significant and rapid declines in native fish diversity as a consequence of increased predation pressure. Thus, whilst non-native fish in the upper Paraná River support provisioning ecosystem services of substantial economic value, the principal species used represent high risks to fish diversity and conservation. It is recommended local management should concentrate on reducing these risks through use of more appropriate species in these ecosystem services, with these decisions derived using risk assessment and precautionary principles.

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Section: Freshwater Fish and Non-native Fish Aquaculture Production Amentioning

confidence: 99%

Non-native fish in aquaculture and sport fishing in Brazil: economic benefits versus risks to fish diversity in the upper River Paraná Basin

Britton

Órsi

2012

Rev Fish Biol Fisheries

117

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“…Hence, the application of SIA for trophic ecology studies in this region requires an evaluation of the use of nonlethal alternatives to muscle tissue on aspects such as isotopic turnover rates and DTDFs. Information garnered from SIA can be used to complement other ecological studies, such as habitat relationships, 59,60 in order to predict potential impacts associated with species introductions and habitat alterations, 61,62 and identify appropriate mitigatory measures to prevent biodiversity loss. 63,64 The aim of this study was to determine the influence of diet composition on the isotopic turnover rates and DTDFs of dorsal white muscle and caudal fin tissue of a freshwater cyprinid minnow, the chubbyhead barb (Enteromius anoplus, Weber, 1897).…”

Section: Introductionmentioning

confidence: 99%

The influence of diet composition and tissue type on the stable isotope incorporation patterns of a small‐bodied southern African minnow Enteromius anoplus (Cypriniformes, Cyprinidae)

Kambikambi

Chakona

2019

Rapid Comm Mass Spectrometry

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Rationale In trophic ecology, the use of stable isotope data relies on the general understanding of isotope turnover rates and diet‐to‐tissue discrimination factors (DTDFs). Recent studies on the application of stable isotope data have shown that isotope turnover rates and DTDFs can be influenced by many factors, including diet composition and tissue type. This study investigated the influence of diet composition and tissue type on stable isotope incorporation patterns in a small‐bodied African minnow, the chubbyhead barb Enteromius anoplus. Methods The isotopic incorporation patterns of carbon (δ13C values) and nitrogen (δ15N values) into white muscle and caudal fin tissues of the chubbyhead barb were examined using two isotopically different diets. Controlled‐diet stable isotope feeding trials using a fishmeal‐based diet (diet 1) and a soya‐based diet (diet 2) were conducted over a 180‐day period for the chubbyhead barb. Results The two diets had contrasting isotopic incorporation patterns: diet 1 was associated with progressively high δ13C and δ15N values, whereas diet 2 was associated with progressively low δ13C and δ15N values over time for both muscle and fin tissues. The δ13C turnover rates were similar for both tissues (56 and 61 days), whereas the δ15N turnover rates differed between fin and muscle tissue in both diets (diet 1 = 4 and 130 days, and diet 2 = 72 and 300 days, respectively). The DTDFs were similar for both tissues in diet 1 (Δ13C: −3.96 to −2.62‰, Δ15N: 1.98 to 2.61‰) and diet 2 (Δ13C: 4.05 to 5.24‰, Δ15N: 8.45 to 9.69‰). Conclusions These results suggest that fin tissue can potentially be used as an alternative for muscle tissue in food web studies with a reasonable level of error. The isotopic turnover rate and DTDFs estimates for E. anoplus, however, require consideration of diet composition because different diets may differ in their isotopic incorporation patterns.

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“…Warmwater aquaculture in South Africa is dominated by three species: Tilapia rendalli, which predominantly feeds on macrophytes (Weliange et al., ; Hlophe and Moyo, ); Oreochromis mossambicus, an algal feeder (El‐Sayed, ; Doupé et al., ); and Clarias gariepinus , with well documented omnivorous/carnivorous feeding habits (Rad et al., ; Kadye and Booth, ). The digestive tracts of T. rendalli and O. mossambicus are largely similar, being characterised by a small sac‐like stomach and long coiled intestines (El‐Sayed, ).…”

Section: Introductionmentioning

confidence: 99%

Postprandial changes in pH and enzyme activity from the stomach and intestines ofTilapia rendalli(Boulenger, 1897), Oreochromis mossambicus(Peters, 1852) andClarias gariepinus(Burchell, 1822)

2013

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Summary The ability to utilise dietary components differs among fish species. Digestive enzymes may be used to determine the efficiency of the digestive process. In this study, the activities of the digestive enzymes in Tilapia rendalli, Oreochromis mossambicus and Clarias gariepinus were explored. Protease, amylase, lipase and cellulase activities were measured in different parts of the digestive tract of the three fish species. The pH dynamics along the digestive tract were monitored. In all fish species, the presence of food led to a reduction in stomach pH, whereby pH values of 1.54, 1.58 and 2.01 were recorded 12 h after feeding in O. mossambicus, T. rendalli and C. gariepinus, respectively. Protease and amylase activities were significantly higher (P < 0.05, anova) in the tilapias than in C. gariepinus. The tilapias may be pre‐adapted to produce more protease and amylase to digest plant material, which is more difficult to digest than animal matter. In all species amylase activity was significantly higher in the proximal intestine than in the other parts of the digestive tract (P < 0.05, anova). The highest protease activity was recorded in the distal intestines. This is because of the alkaline pH recorded in the proximal and distal intestines, which favours amylase and protease activity, respectively. Lipase activities were significantly higher (P > 0.05) in C. gariepinus than in both tilapias. Marginal cellulase activities were recorded in all species. It is inferred here that phylogeny and not diet may be the main factor influencing enzyme activities, as all fish were fed a similar diet.

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Integrating stomach content and stable isotope analyses to elucidate the feeding habits of non-native sharptooth catfish Clarias gariepinus

Cited by 57 publications

References 61 publications

Non-native fish in aquaculture and sport fishing in Brazil: economic benefits versus risks to fish diversity in the upper River Paraná Basin

Non-native fish in aquaculture and sport fishing in Brazil: economic benefits versus risks to fish diversity in the upper River Paraná Basin

The influence of diet composition and tissue type on the stable isotope incorporation patterns of a small‐bodied southern African minnow Enteromius anoplus (Cypriniformes, Cyprinidae)

Postprandial changes in pH and enzyme activity from the stomach and intestines ofTilapia rendalli(Boulenger, 1897), Oreochromis mossambicus(Peters, 1852) andClarias gariepinus(Burchell, 1822)

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