Feeding and body condition of an invasive fish species under different environmental conditions

Pazianoto, Laryssa H. R.; Cionek, Vivian de Mello; Fogaça, Fábio Nascimento Oliveira; Benedito, Evanilde

doi:10.1590/1982-0224-20150164

Cited by 8 publications

(5 citation statements)

References 55 publications

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“…In this sense, LWRs from similar species and different regions are commonly used for the biomass estimation of mesopelagic fish species from acoustics (Fock & Czudaj, 2018;Fock & Ehrich, 2010), despite possible differences in allometric relationships (Atkinson, 1989). Similarly, the condition factor is considered to be a proxy of fitness in determining the population health and variability of individuals and populations (Brosset et al, 2017;Lloret et al, 2002Lloret et al, , 2014Millar & Hickling, 1990;Pazianoto et al, 2016), but there is a lack of information for mesopelagic fishes (Watanabe & Kawaguchi, 2003).…”

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confidence: 99%

Length–weight relationships of mesopelagic fishes from the equatorial and tropical Atlantic waters: influence of environment and body shape

López-Pérez

Olivar

Hulley

et al. 2020

Journal of Fish Biology

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Length-weight relationships (LWRs) were estimated for 36 mesopelagic fish species collected from the equatorial and tropical Atlantic encompassing several oceanographic regions: oligotrophic, equatorial, Cape Blanc, Cape Verde and the Canary Islands. The sample was composed of myctophids (25 species), gonostomatids (5), sternoptychids (3), stomiids (2) and phosichthyids (1). The species were clustered according to body shape: "short-deep" (sternoptychids), "elongate" (gonostomatids, stomiids and some phosichthyids) and "fusiform" (myctophids and some phosichthyids). Three types of weight and LWRs were considered: wet weight (WW), eviscerated wet weight (eWW) and eviscerated dry weight (eDW). The study demonstrated that most species present a positive allometric growth, independent of the weight used. However, the allometric value varied in 40-50% of species depending on the type of weight considered. Significant variations linked to fish morphology were found in the relationship between the slope and intercept of the LWR equation. Significant differences were also noted in the water content linked to fish body shape. Based on the distributions of several species we compare their fitness between oceanographic regions using the relative condition factor (K rel). Except for Diaphus brachycephalus (oligotrophic vs. equatorial waters) and Lampanyctus alatus (equatorial, Cape Blanc, Cape Verde and the Canary Islands), no regional significant differences were observed in the species analysed.

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confidence: 99%

Length–weight relationships of mesopelagic fishes from the equatorial and tropical Atlantic waters: influence of environment and body shape

López-Pérez

Olivar

Hulley

et al. 2020

Journal of Fish Biology

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“…However, despite temporal (between seasons) and spatial (in the Verdon River) trophic niche variation, body condition in Z. asper was not related to either quantitative (e.g., BIC) or qualitative (dietary clusters) dietary variation. In fish, body condition is driven by a variety of biotic and abiotic factors, and food quality, quantity, and availability have proven to be major drivers of body condition (Bojsen, 2005 ; Pazianoto et al, 2016 ; Pothoven et al, 2001 ). Body condition summarizes one part of the health and physiological state of individuals (Cavraro et al, 2019 ; Stevenson & Woods Jr, 2006 ) and therefore their potential fitness (Kotiaho, 1999 ; Wells et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

DNA metabarcoding suggests adaptive seasonal variation of individual trophic traits in a critically endangered fish

et al. 2022

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Dietary studies are critical for understanding foraging strategies and have important applications in conservation and habitat management. We applied a robust metabarcoding protocol to characterize the diet of the critically endangered freshwater fish Zingel asper (the Rhone streber). We conducted modelling and simulation analyses to identify and characterize some of the drivers of individual trophic trait variation in this species. We found that population density and ontogeny had minor effects on the trophic niche of Z. asper. Instead, our results suggest that the majority of trophic niche variation was driven by seasonal variation in ecological opportunity. The total trophic niche width of Z. asper seasonally expanded to include a broader range of prey. Furthermore, null model simulations revealed that the increase of between-individual variation in autumn indicates that Z. asper become more opportunistic relative to summer and spring, rather than being associated with a seasonal specialization of individuals. Overall, our results suggest an adaptive variation of individual trophic traits in Z. asper: the species mainly consumes a few ephemeropteran taxa (Baetis fuscatus and Ecdyonurus) but seems to be capable of adapting its foraging strategy to maintain its body condition. This study illustrates how metabarcoding data obtained from faeces can be validated and combined with individual-based modelling and simulation approaches to explore inter-and intrapopulational individual trophic traits variation and to test hypotheses in the conventional analytic framework of trophic ecology.

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“…Observações sobre a população Última avaliação Justificativa disponibilidade desses itens na região (Pazianoto et al, 2016).…”

Section: Reproduçãounclassified

Ficha de Hemiodus orthonops

Bruno Francelino de Melo,

Carla Natacha Marcolino Polaz,

Carla Simone Pavanelli

et al. 2024

Datasets - Sistema SALVE - ICMBio

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Hemiodus orthonops é conhecida das bacias dos rios Paraguai e Paraná, no Brasil, Bolívia, Paraguai e Argentina. No Brasil, ocorre nos estados de Mato Grosso e Mato Grosso do Sul. No alto rio Paraná, nos estados de São Paulo, Paraná e Mato Grosso do Sul, a espécie é considerada alóctone, pois se dispersou após a construção do reservatório de Itaipu. A espécie é amplamente distribuída, frequente e abundante. Como não foram identificadas ameaças significativas que coloquem a sua população em risco, Hemiodus orthonops foi categorizada como Menos Preocupante (LC).

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Feeding and body condition of an invasive fish species under different environmental conditions

Cited by 8 publications

References 55 publications

Length–weight relationships of mesopelagic fishes from the equatorial and tropical Atlantic waters: influence of environment and body shape

Length–weight relationships of mesopelagic fishes from the equatorial and tropical Atlantic waters: influence of environment and body shape

DNA metabarcoding suggests adaptive seasonal variation of individual trophic traits in a critically endangered fish

Ficha de Hemiodus orthonops

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