Rythmes alimentaires et alimentation chez les Siluroidei

Boujard, Thierry; Luquet, P.

doi:10.1051/alr:1996046

Cited by 19 publications

(11 citation statements)

References 30 publications

(18 reference statements)

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“…Decreased activity of prey at night might decrease vulnerability to nocturnal predators if these track prey movements using the lateral line, as recently described in another siluriform (Pohlmann et al, 2001(Pohlmann et al, , 2004, or might increase it if detection is done by chemical stimuli. Foraging by nocturnal piscivores is much less understood than for visual predators (Pohlmann et al, 2004;Giaquinto & Hoffmann, 2010), despite the enormous diversity of siluriform fishes, which seem to be mainly nocturnal (Boujard & Luquet, 1996).…”

Section: Discussionmentioning

confidence: 99%

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

et al. 2012

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We experimentally examined the predator-prey relationships between juvenile spotted sorubim Pseudoplastystoma corruscans and young-of-the-year invasive and native fish species of the Paraná River basin, Brazil. Three invasive (peacock bass Cichla piquiti, Nile tilapia Oreochromis niloticus, and channel catfish Ictalurus punctatus) and two native (yellowtail tetra Astyanax altiparanae and streaked prochilod Prochilodus lineatus) fish species were offered as prey to P. corruscans in 300 L aquaria with three habitat complexity treatments (0%, 50% and 100% structure-covered). Prey survival was variable through time and among species (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), depending largely on species-specific prey behavior but also on prey size and morphological defenses. Habitat complexity did not directly affect P. corruscans piscivory but some prey species changed their microhabitat use and shoaling behavior among habitat treatments in predator's presence. Pseudoplatystoma corruscans preyed preferentially on smaller individuals of those invasive species with weak morphological defensive features that persisted in a non-shoaling behavior. Overall, our results contrast with those in a companion experiment using a diurnal predator, suggesting that nocturnal piscivores preferentially prey on different (rather diurnal) fish species and are less affected by habitat complexity. Our findings suggest that recovering the native populations of P. corruscans might help controling some fish species introduced to the Paraná River basin, particularly C. piquiti and O. niloticus, whose parental care is expected to be weak or null at night.A relação predador-presa entre juvenis de pintado Pseudoplatystoma corruscans (piscívoro nativo) e jovens do ano de espécies nativas e invasoras de peixes da bacia do rio Paraná, Brasil, foi testada experimentalmente. Três espécies de peixe invasoras (o tucunaré Cichla piquiti, a tilápia do Nilo Oreochromis niloticus e o bagre do canal Ictalurus punctatus) e duas nativas (o lambari do rabo amarelo Astyanax altiparanae e o curimbatá Prochilodus lineatus) foram oferecidas como presa para P. corruscans em microcosmos, com três tratamentos de complexidade de habitat (0%, 50% e 100% de cobertura por estruturas submersas). A sobrevivência de presas variou ao longo do tempo e entre espécies (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), sendo governada, em grande parte, por diferenças espécies-específicas no comportamento das presas, mas também pelo tamanho e defesas morfológicas das mesmas. A complexidade de habitat não afetou diretamente a piscivoria de P. corruscans, mas, na presença do predador, algumas espécies-presa alteraram seu comportamento quanto ao uso de micro-habitat e grau de agregação entre os níveis de complexidade de habitat. Pseudoplatystoma corruscans predou preferencialmente sobre os indivíduos menores das espécies invasoras que apresentaram estruturas morfológicas defensivas pouco desenvolvidas e que não formavam cardu...

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Section: Discussionmentioning

confidence: 99%

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

et al. 2012

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“…The FCR is useful for aquaculture purposes because it estimates the amount of food required for producing a desired weight gain of fish. It is difficult, however, to accurately measure total food intake, and measured differences in FCR may be caused by changes in food intake as well as changes in nutrient retention efficiency (Boujard and Luquet 1996). In this regard, it is important to point out that the 27 and 30 C groups of fish in our studies exhibited robust feeding activity and came to the surface to eat the pellets in a voracious manner.…”

Section: Discussionmentioning

confidence: 99%

Effects of Temperature on Performance Characteristics and the Cortisol Stress Response of Surubim Pseudoplatystoma sp.

Lima

Ribeiro

Malison

et al. 2006

J World Aquaculture Soc

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Three experiments were conducted in flow‐through tanks at 24, 27 and 30 C to evaluate growth, food conversion, morbidity, survival, and the cortisol stress response of surubim Pseudoplatystoma sp. at different temperatures. In Experiment 1, fish (mean initial weight, 33.3 ± 7.2 g) reared at 27 and 30 C for 60 d grew significantly faster than fish reared at 24 C (P < 0.05). Fish at the lowest temperature showed the poorest feed conversion ratio (FCR, 5:1), while fish at 27 and 30 C had FCRs of 2.5:1 and 3.5:1, respectively. Mortality and morbidity rates were inversely proportional to the temperatures tested. In Experiment 2, serum cortisol levels following an acute handling stressor peaked at 30 min after stress, returned to near‐resting levels at 1 h after stress, and completely returned to resting levels at 3 h after stress in fish at all temperatures tested. Peak serum cortisol levels were higher in fish at 30 C (321.1 ± 38.8 ng/mL) than those in fish at 27 and 24 C (143.3 ± 37.4 ng/mL and 104.2 ± 37.2 ng/mL, respectively). In Experiment 3, fish (mean initial weight, 67 ± 8.58 g) reared at 27 C for 137 d grew significantly faster than fish at 30 and 24 C. Virtually, all fish reared in 30 C had some sign of morbidity (skin lesions and fin abrasion) compared to only a small percentage of fish in the other two temperatures. Again, the highest cortisol peak level was measured in fish reared at 30 C (117.6 ± 16.7 ng/mL), as compared to fish at 24 and 27 C (99.2 ± 15.5 ng/mL and 80.2 ± 12.8 ng/mL, respectively). Our findings indicate that the optimum temperature for rearing surubim in tanks is 27 C. At 30 C, these fish may suffer from stress, as suggested by the elevated peak of cortisol and morbidity and mortality rates. The relatively rapid cortisol stress response of surubim suggests that they may be more tolerant to handling stressors than other fish species.

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“…The timing of feed provision may affect fish growth ( Noeske‐Hallin, Spieler, Parker & Suttle 1985; Carrillo, Perez & Zanuy 1986; Kerdchuen & Legendre 1991; Reddy, Leatherland, Khan & Boujard 1994; Boujard, Gelineau & Corraze 1995; Boujard & Luquet 1996). Nevertheless, restricting the length of time feed is available to a few hours each day has been reported to decrease feed waste without negatively affecting the growth of rainbow trout Oncorhynchus mykiss (Walbaum) ( Alanärä 1992).…”

Section: Introductionmentioning

confidence: 99%

Influence of stocking density on growth of juvenile red porgy Pagrus pagrus L. under different feeding conditions

Maragoudaki

Paspatis²,

Kentouri

1999

Aquaculture Research

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The influence of stocking density and feeding regime on the growth of red porgy was studied during winter and spring 1997. Fish were held in 500‐L tanks at densities of either 50 or 100 fish per tank, and were fed by means of self‐feeders under 6 h restricted (day or night) or free‐access feeding regimes. Fish were tagged individually, and weight gain was recorded by individual weighing every second week over an 8‐week period during each season. In winter, growth was influenced by feeding time. Fish tended to grow best when fed without restriction and worst when fed at night, although differences were not significant when tank means were compared. Stocking density was influential in the spring trial. Fish stocked at low density and feeding freely grew better than high‐density fish that fed either freely or at night. The division of fish into three size classes revealed that, within each treatment, no differences occurred among classes, but growth of fish belonging to the same class was influenced by rearing conditions. No significant differences were found among feeding regimes in terms of the coefficients of weight variation ratio (CVf:CVi) and feed efficiency.

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Rythmes alimentaires et alimentation chez les Siluroidei

Cited by 19 publications

References 30 publications

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

Effects of Temperature on Performance Characteristics and the Cortisol Stress Response of Surubim Pseudoplatystoma sp.

Influence of stocking density on growth of juvenile red porgy Pagrus pagrus L. under different feeding conditions

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