Elemental composition and microbial decomposition of different angling baits

Imbert, Alexis; Parthuisot, Nathalie; Boulêtreau, Stéphanie

doi:10.1111/fme.12537

Cited by 5 publications

(6 citation statements)

References 48 publications

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“…Although the baits analysed for their stable isotope data all showed δ 13 C enrichment and, generally, δ 15 N depletion, there was still considerable isotopic variation between them, thus species‐specific consumption of certain baits could have driven niche divergence. This divergence would also be influenced by the different bait sizes, with the smallest particles being in groundbait and the largest baits being boilies and pellets (Imbert et al, 2022). These baits are recognised as being size‐selective in angling, with bigger baits only capable of ingestion by fish with a sufficiently large gape (Sánchez‐Hernández et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The baits used within angling for cyprinid fishes can be grouped into four general categories: seeds (mainly cereals, such as corn/ maize), groundbaits (a mix of relatively fine plant and animal flours), boilies (boiled mix of animal or vegetable flours and eggs, formed into balls of up to 30 mm diameter) and pellets (pelletised animal flours and oils, often based on marine fishmeal, of diameters 1-32 mm; Imbert et al, 2022). In general, groundbaits are used for targeting smaller bodied cyprinid species (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Novel trophic subsidies from recreational angling transform the trophic ecology of freshwater fishes

Britton

Almela

2022

Journal of Applied Ecology

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1. Angling is a globally popular leisure activity. There are over 31 million anglers in Europe, many of which target species of the Cyprinidae family in lowland freshwater ecosystems using methods generally involving bait (e.g. groundbaits, seeds and pellets), with large bait inputs possible in periods of high angling activity. While these bait inputs act as novel trophic subsidies ('angling subsidy'), substantial knowledge gaps remain on their influence on freshwater food webs, including on fish trophic niche size and position.2. The effects of angling subsidies on the trophic ecology of cyprinid fish populations and their macroinvertebrate prey resources were investigated in field studies comparing waters of high angling activity ('subsidised fisheries') versus low angling activity ('non-subsidised fisheries'), and complemented by a pond experiment using two cyprinid species in subsidy absence/presence. Methods were based on stable isotope analysis, with angling subsidies being δ 13 C enriched and, generally, δ 15 N depleted compared to macroinvertebrate prey resources.3. In the subsidised fisheries, while there were minimal influences of the baits on macroinvertebrate stable isotope values, the effects of the subsidies on all fish species were to substantially δ 13 C enrich and δ 15 N deplete their isotopic niches.However, patterns of interspecific niche divergence remained similar between the species in subsidy presence.4. In the pond experiment, there was strong isotopic association between the two fish species and macroinvertebrate putative prey in subsidy absence. In treatments that then exposed both species to angling subsidies, their stable isotope values shifted to enriched δ 13 C. Synthesis and application.Where angling activity is high, angling baits can provide strong trophic subsidies to freshwater fish, but with minimal effects on other trophic levels. Their regular input into freshwaters can provide some substantial benefits for fish (e.g. increased growth rates) and fisheries (e.g. elevated carrying capacity, higher catch rates), but can also increase nutrient enrichment and potentially raise concerns on angling ethics. Thus, in allowing the use of

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel trophic subsidies from recreational angling transform the trophic ecology of freshwater fishes

Britton

Almela

2022

Journal of Applied Ecology

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“…The quantities of angling baits used are highly variable, and averaged around 14.2 kg/year for cyprinid anglers with maximum values exceeding 200 kg/year for specialised carp anglers in Germany (Arlinghaus, 2004;Arlinghaus & Mehner, 2003). In general, angling baits have higher nitrogen (N) and phosphorous (P) contents than natural t-OC, making them significant contributors of nutrients to lakes (Elser et al, 2000;Imbert et al, 2022;Wenzel et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…A principal component analysis based on the hydro-morphological characteristics and the spatial distribution of the gravel pit lakes was performed and revealed no significant differences in environmental conditions among the fishery types (PERMANOVA, p = 0.344, Figure SI.1). Angling baits can be rich in nutrients (Imbert et al, 2022) and potentially impact water quality where they are used. Therefore, variables related to water quality were not included in these analyses.…”

Section: Introductionmentioning

confidence: 99%

Angling bait consumption and stable isotope niche of two cyprinids in different lake fisheries

Imbert,

Beisel,

Boulêtreau

et al. 2024

Freshwater Biology

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Terrestrial subsidies are important for freshwater ecosystems and, in lakes supporting recreational fisheries, angling baits can represent an important allochthonous input. This resource can directly contribute to fish diet but its consumption may be influenced by fish body size and the type of angling baits used in different fisheries. In this study, we evaluated angling baits consumption by two common cyprinid species, Cyprinus carpio and Rutilus rutilus, in three fishery types (specialised carp, specialised roach, and put‐and‐take fisheries). We used stable isotope analyses (δ13C and δ15N) of cyprinids, their natural prey and different angling baits in 16 gravel pit lakes located in south‐western France, including four lakes without angling. Angling baits were significantly δ13C‐enriched and δ15N‐depleted compared to natural prey. Overall, angling bait consumption was highly variable between individuals. For C. carpio, angling bait consumption averaged 30.5% (±17.0 SD) and was higher in specialised carp fisheries (40.0% ± 16.7 SD) than in put‐and‐take fisheries (15.9% ± 9.0 SD) and was not related to body size. For R. rutilus, angling bait consumption averaged 41.3% (±15.7 SD), did not differ significantly among fishery types, but increased with body size. The niche width of C. carpio was six times larger in specialised carp fisheries than in lakes without angling. For R. rutilus, niche width was two times larger in specialised carp and put‐and‐take fisheries compared to lakes without angling and specialised roach fisheries. These results indicate that angling bait subsidies represent a novel and substantial resource opportunity for fishes in angling lakes, with trophic consequences for the targeted species through increase of their stable isotope niche size. These impacts are partly influenced by the type of angling baits used by anglers and the characteristics of the fisheries, suggesting the need for improved quantification of the temporal dynamics of this type of subsidy to better understand its consequences on freshwater fish and recipient ecosystems.

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“…1 to 7 kg) (North 2002) or smaller numbers of relatively large fish (>10 kg) (Žák 2021). In the study area (see below), angling tactics in these fisheries also tend to be dominated by use of manufactured baits, many of which are maize based with highly enriched values of δ 13 C when compared with natural prey items (Britton et al, 2022; Imbert et al, 2022). Where these fisheries have a high stock density of carp that are fished for regularly, their diet (and the diets of other species present) tend to be dominated by these baits (Britton et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Relationships of scale cortisol content suggests stress resilience in freshwater fish vulnerable to catch-and-release angling in recreational fisheries

Britton

Andreou

López‐Béjar

et al. 2022

Preprint

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The capture by angling of an individual fish is recognised as a short-term physiologically stressor. In fish populations exploited by catch and release angling (C&R), there is potential for some individual fishes to be captured on multiple occasions, but the longer term physiological consequences of this remain uncertain. Using scale cortisol content as a biomarker of chronic stress and scale samples from two fish populations exploited by C&R angling, we developed proxies of angling capture vulnerability before testing these proxies against scale cortisol content. In a riverine population of European barbel Barbus barbus, fish with the highest scale cortisol content were predicted as those sampled by angling rather than electric fishing, as angled fish had significantly smaller home ranges and diets based primarily on angling baits. In a population of common carp Cyprinus carpio in a small pond fishery, we predicted that fish with the highest scale cortisol content would be those with higher proportions of angling bait in their diet. In both species, however, the fish predicted to be most vulnerable to angling capture had the lowest levels of scale cortisol content. We suggest that this is through fish that are captured regularly being highly stress resilient (with this independent of other traits) or fish with traits that suggest high capture vulnerability being able to minimise their recapture rates through developing hook avoidance behaviours after an initial capture. Overall, these results suggest that scale cortisol content is a useful biomarker for measuring chronic stress from C&R angling.

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Elemental composition and microbial decomposition of different angling baits

Cited by 5 publications

References 48 publications

Novel trophic subsidies from recreational angling transform the trophic ecology of freshwater fishes

Novel trophic subsidies from recreational angling transform the trophic ecology of freshwater fishes

Angling bait consumption and stable isotope niche of two cyprinids in different lake fisheries

Relationships of scale cortisol content suggests stress resilience in freshwater fish vulnerable to catch-and-release angling in recreational fisheries

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