Progressive reductions in the movement induced in food when rearing Rana perezi Seoane, 1885, in captivity

Real, M.; Martínez, Irene P.; Álvarez, Rafael

doi:10.1016/j.aquaculture.2005.02.060

Cited by 6 publications

(2 citation statements)

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“…These insects are part of the natural food of frogs, corresponding to 0.85% of dietary protein and to 83% of digestibility of crude protein (Olvera-Novoa et al, 2007). The prejudice and rejection by consumers are the main factors limiting the use of larvae on frog farms (Lima et al, 1999), and it is therefore necessary to reduce the use of these insects for frog feeding (Real et al, 2005). In the present study, we suggested a feeding strategy that does not use housefly larvae.…”

Section: Discussionmentioning

confidence: 75%

A vibrating feeder tray improves bullfrog production

Pahor-Filho

Pereira

Stéfani

2015

Aquacultural Engineering

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a b s t r a c tStudies have developed techniques for bullfrog feeding in which movement of the food stimulates food intake in the absence of housefly larvae. We analyze a completely randomized design with two treatments (vibrating tray and linear feeder) in triplicate. A total of 1800 bullfrog froglets (Lithobates catesbeianus) (7.60 ± 0.59 g) were divided in six pens of 12 m 2 and density 25/m 2 . Three fattening pens contained linear cement feeders (3.0 × 0.50 m) with a V-shaped bottom that crossed the pen longitudinally at each side of the pool containing commercial diet (40% crude protein) with added 5% housefly larvae. In the other three pens, six vibrating feeders trays (80 × 34 cm) per pen were arranged linearly, three at each side of the pool with commercial ration without housefly larvae. The productive performance of frogs was assessed by weight gain, feed intake, feed conversion, specific growth rate and survival by 90 days. We observed that bullfrog froglets receiving food in a vibrating feeder tray present better productive performance (weight gain, feed conversion and specific growth rate) than animals fed ration and housefly larvae in a linear feeder. This response can be related to the greater visual stimulus of the food by frogs fed in vibrating feeder trays, in which food had greater movement.

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Section: Discussionmentioning

confidence: 75%

A vibrating feeder tray improves bullfrog production

Pahor-Filho

Pereira

Stéfani

2015

Aquacultural Engineering

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“…However, in light of economic cost–benefit evaluation the provisioning of frogs with live prey is too expensive and time‐consuming to make a frog farm profitable (Aabedi et al., ; Helfrich et al., ; Miles et al., ; Quoc, ; Real, Martínez, & Álvarez, ). After all, we cannot give conclusive proof that the frogs from Indonesia are caught from the wild.…”

Section: Discussionmentioning

confidence: 99%

Stable isotope analyses—A method to distinguish intensively farmed from wild frogs

Dittrich

Struck

Rödel

2017

Ecology and Evolution

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Consumption of frog legs is increasing worldwide, with potentially dramatic effects for ecosystems. More and more functioning frog farms are reported to exist. However, due to the lack of reliable methods to distinguish farmed from wild‐caught individuals, the origin of frogs in the international trade is often uncertain. Here, we present a new methodological approach to this problem. We investigated the isotopic composition of legally traded frog legs from suppliers in Vietnam and Indonesia. Muscle and bone tissue samples were examined for δ15N, δ13C, and δ18O stable isotope compositions, to elucidate the conditions under which the frogs grew up. We used DNA barcoding (16S rRNA) to verify species identities. We identified three traded species (Hoplobatrachus rugulosus, Fejervarya cancrivora and Limnonectes macrodon); species identities were partly deviating from package labeling. Isotopic values of δ15N and δ18O showed significant differences between species and country of origin. Based on low δ15N composition and generally little variation in stable isotope values, our results imply that frogs from Vietnam were indeed farmed. In contrast, the frogs from the Indonesian supplier likely grew up under natural conditions, indicated by higher δ15N values and stronger variability in the stable isotope composition. Our results indicate that stable isotope analyses seem to be a useful tool to distinguish between naturally growing and intensively farmed frogs. We believe that this method can be used to improve the control in the international trade of frog legs, as well as for other biological products, thus supporting farming activities and decreasing pressure on wild populations. However, we examined different species from different countries and had no access to samples of individuals with confirmed origin and living conditions. Therefore, we suggest improving this method further with individuals of known origin and history, preferably including samples of the respective nutritive bases.

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Significance of initial weight of post-metamorphosis froglets for growth and fattening of Rana perezi Seoane, 1885, raised in captivity

Álvarez

Real

2006

Aquaculture

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Progressive reductions in the movement induced in food when rearing Rana perezi Seoane, 1885, in captivity

Cited by 6 publications

References 0 publications

A vibrating feeder tray improves bullfrog production

A vibrating feeder tray improves bullfrog production

Stable isotope analyses—A method to distinguish intensively farmed from wild frogs

Significance of initial weight of post-metamorphosis froglets for growth and fattening of Rana perezi Seoane, 1885, raised in captivity

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