Buccal apparatus and gastrointestinal tract dimensions associated to the diet of early life stages of Centropomus undecimalis (Centropomidae, Actinopterygii)

Araújo, Isabela M. S.; Silva-Falcão, Elisabeth Cabral; Severi, William

doi:10.1590/s0073-47212011000100012

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…Body size plays a central role in predator-prey interactions (Shelton et al, 1977 et al, 2003). Our finding confirms previous stomach content and behavioral studies revealing an ontogenetic shift in snook diets (Blewett et al, 2006;Contente et al, 2009;Araújo et al, 2011).…”

Section: Discussionsupporting

confidence: 93%

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

Gonzalez

Ménard

Loc’h

et al. 2019

Estuarine, Coastal and Shelf Science

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We investigated the trophic niches and the resource partitioning of two snook species, the common (Centropomus undecimalis) and the fat snook (C. parallelus), in four tropical estuaries of the northeastern Brazil, using stable isotope analyses of carbon (δ13C) and nitrogen (δ15N). Fish specimens, mainly juveniles, basal resources and a primary consumer were collected in 2015 during dry and rainy seasons in all estuaries, which exhibited differences in system size, geomorphologic shapes, levels of sea access and anthropic pressures. Potential effect of factors like fish body length, estuary and seasonality on isotope ratios were investigated. Positive relationships between the size of fish and δ15N values were found, regardless the species. Our results indicated that snooks can be characterized as secondary consumers and have close trophic niches in most estuaries. Trophic overlaps were more pronounced within the largest estuaries (Catuama and Santa Cruz), whereas smaller systems that have restricted connections to the sea presented low isotopic niche overlap between both species (Suape and Sirinhaém). Moreover, a higher variability of δ13C and δ15N values in snooks was found in larger estuaries undergoing stronger influences from coastal adjacent waters. Although we were not able to detect clear seasonal effects, greater isotopic overlaps were found during the rainy season. Despite the lack of intrinsic differences in life history traits, both species, dominated by juveniles, shared similar trophic niches in these environments. Highlights ► δ 13 C and δ 15 N of two Centropomidae were investigated in four estuaries in Brazil. ► Juveniles of Centropomus undecimalis and C. parallelus have close isotopic niches. ► Trophic overlaps were more pronounced in large estuaries. ► Resource partitioning process might reflects the resource availability in estuaries.

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Section: Discussionsupporting

confidence: 93%

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

Gonzalez

Ménard

Loc’h

et al. 2019

Estuarine, Coastal and Shelf Science

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“…where D is mouth gape size in mm and AB is the length of upper maxilla in mm (AB was measured with open mouth; Araújo, Silva-Falcão, & Severi, 2011). Calculations of the specific growth rates (sG) for the whitefish were performed after Equation (5), suggested by Brett, Shelbourn, and Shoop (1969):…”

Section: Fish-feeding Experimentsmentioning

confidence: 99%

Impacts of increasing nitrogen:phosphorus ratios on zooplankton community composition and whitefish (Coregonus macrophthalmus) growth in a pre‐alpine lake

2019

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The combination of increasing atmospheric depositions of reactive nitrogen (N) and the highly effective diminishing of external phosphorus (P) loadings can change key nutrient ratios in lake ecosystems. Consequently, ratios of dissolved inorganic N (DIN) to dissolved P (DP) in lakes are increasing. However, potential consequences for aquatic organisms are as yet far from understood. We formulated three hypotheses on the potential effects of rising DIN:DP ratios on a lake food web: (1) increasing DIN:DP ratios intensify the P limitation of phytoplankton communities and lower their food quality; (2) densities of P rich zooplankters (e.g. cladocerans) will be negatively affected by P‐limited food algae; (3) as result, planktivorous fish will experience a reduction of their main prey (especially Daphnia species) and respond with lowered growth. These hypotheses were tested in a mesocosm experiment conducted in a pre‐alpine lake in southern Germany, Lake Brunnensee. For 76 days, the natural phytoplankton and zooplankton communities were exposed to a wide gradient of DIN:DP ratios. At the end of the experiment, juvenile planktivorous whitefish (Coregonus macrophthalmus) were released into the mesocosms and allowed to feed on zooplankton communities for 72 hr. Along the gradient of DIN:DP ratios, we found evidence for a rising P limitation of autotroph growth, which was indicated by increasing ratios of N:P (15:1–157:1) and C:P (91:1–797:1) in seston biomass. The rising P limitation in algae reduced the nutritional food quality for the majority of herbivorous zooplankton. Both the total zooplankton biomass and the Daphnia biomass declined substantially with increasing DIN:DP ratios. In contrast, increasing DIN:DP ratios favoured rotifer species, showing strong positive correlation with rotifer biomass. Whitefish weights decreased with increasing rotifer biomass and increased with rising Daphnia biomass in zooplankton communities. In summary, our results provide an experimental demonstration that increasing DIN:DP ratios can cause stoichiometric shifts in the biomass of primary producers towards higher N:P and C:P ratios. Effects on zooplankton were changes in the taxonomical community composition towards lower cladoceran biomass (mainly Daphnia spp.). The reduction in Daphnia biomass in turn caused significantly reduced growth rates of whitefish in our experiment. Our experimental results therefore support the assumption that stoichiometric effects can travel up the food chain. General consequences of such multi‐trophic effects induced by altered nutrient ratios could be potentially visible during re‐oligotrophication of water bodies, often resulting in high N:P ratios. Further empirical studies could look for signatures of these effects on the yield of economically important species.

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“…). In order to estimate larvae gape size, the formula proposed by Shirota () was used, D = √2AB, where D is mouth gape size and AB is the measurement of the upper maxilla length (Araujo et al ).…”

Section: Methodsmentioning

confidence: 99%

Effect of Two Novel Experimental Microdiet Types on Growth, Survival, and Pigmentation during the Weaning Period of the Fine Flounder, Paralichthys adspersus, Larvae

Orihuela

Montes

Linares-Cordova

et al. 2018

J World Aquaculture Soc

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The aim of this study was to evaluate two new types of experimental weaning microdiets for fish larvae, using the same formulation, but with different manufacturing processes, microextrusion marumerization (MEM) and particle‐assisted rotational agglomeration (PARA). Both microdiets were compared to a commercial microdiet, Otohime™ (OTO), during the weaning of the fine flounder, Paralichthys adspersus. Weaning was achieved by cofeeding with live food from 40 to 50 d after hatch (d.a.h.). Thereafter, only the microdiets were fed to the end of the study (60 d.a.h.), where the total length, dry weight, and survival rates were 15.9 ± 3.20, 14.3 ± 1.72, and 14.4 ± 2.28 mm; 8.83 ± 3.40, 5.53 ± 2.85, and 7.10 ± 3.56 mg; 18.1, 16.3, and 15.2%, for OTO, MEM, and PARA, respectively. The dry weight and total length were significantly higher (P < 0.05) for larvae fed OTO compared with those fed MEM. There were no differences between the other comparisons. Based on these results, any of the two experimental microdiets can be used for future investigations. However, we recommend the PARA microdiets because the manufacturing process produces less‐dense and smaller particle size diets, reducing sinking rates and increasing the probability of the larvae in detecting and ingesting the diet.

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Buccal apparatus and gastrointestinal tract dimensions associated to the diet of early life stages of Centropomus undecimalis (Centropomidae, Actinopterygii)

Cited by 7 publications

References 25 publications

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

Impacts of increasing nitrogen:phosphorus ratios on zooplankton community composition and whitefish (Coregonus macrophthalmus) growth in a pre‐alpine lake

Effect of Two Novel Experimental Microdiet Types on Growth, Survival, and Pigmentation during the Weaning Period of the Fine Flounder, Paralichthys adspersus, Larvae

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