Contribution à l'élevage de l'escargot Petit-gris : Helix aspersa Müller (Mollusque Gastéropode Pulmoné Stylommatophore). III. - Elevage mixte (reproduction en bâtiment contrôlé et engraissement en parc extérieur) : activité des individus et évolution de la population juvénile selon la charge biotique du parc

Daguzan, Jean-François; Bonnet, J.-C.; Perrin, Yannick; Perrin, Emmanuelle; Rouet, H.

doi:10.1051/animres:19850201

Cited by 14 publications

(7 citation statements)

References 3 publications

(5 reference statements)

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“…Given that a majority of the active period is spent looking for food and actually feeding, DFIR logically has the same types of variation as the level of activity, and varies in parallel. DFIR values recorded in our experiment are in accord with observations on farms where well known species such as Helix aspersa and H. pomatia are reared (Charrier & Daguzan 1980;Fonolla et al 1980;Daguzan 1985). However, comparison shows that the consumption levels for P. fibratus are relatively low.…”

Section: Discussionsupporting

confidence: 90%

“…P. fibratus can live a long time (see Discussion), hence, differences observed between adult snails' weight could be explained by the age of snails and weight of shells. Relative to conditions in the wild (Cherel-Mora 1983;Pollabauer 1995) the biomass levels in this experiment were high, but are in accord with standards used, for example, in breeding stock on Helix aspersa farms (Daguzan 1981(Daguzan , 1985Denormandie 1991).…”

Section: Animalssupporting

confidence: 81%

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Activity and food intake of captivePlacostylus fibratus(Gastropoda: Bulimulidae) in New Caledonia

Salas¹,

Bonnaut²,

Bel³

et al. 1997

New Zealand Journal of Zoology

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Placostylus fibratus is an endemic endangered species from New Caledonia. This snail is favoured as food, and the harvests for consumption from the wild population increase alarmingly. Thus, local authorities decided to promote research into the rearing methods for P. fibratus. Sixty-three snails from the Isle of Pines, divided into five groups, were subjected to different temperatures (20, 25, and 30°C) and humidities (80 ± 5% and 95 ± 5%) and constant light conditions (12 h:12 h photoperiod). The variables measured were activity levels (percent active animals, i.e. outside the shell) and daily food intake rate (DFIR, in milligrams dry matter per gram of live snail weight). The average proportion of active animals throughout the experiment amounted to 14.3%, with an average DFIR of 1.61 mg/g. P. fibratus were more active (and consumed more) at lower temperatures and higher humidity levels. From 20 to 30°C the activity level dropped from 24.9 to 6.5% and DFIR from 2.7 to 0.33 mg/g (adjusted averages). Overall, P. fibratus seemed capable of tolerating average temperatures (in the region of 25°C) if humidity was high. However, around 30°C they became almost completely inactive, regardless of humidity. The light/dark regime had a very limited impact on the variables under examination, and P. fibratus' nocturnal behaviour in the wild is likely to be explained by the need for favourable temperature and humidity levels.

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Section: Discussionsupporting

confidence: 90%

Section: Animalssupporting

confidence: 81%

Activity and food intake of captivePlacostylus fibratus(Gastropoda: Bulimulidae) in New Caledonia

Salas¹,

Bonnaut²,

Bel³

et al. 1997

New Zealand Journal of Zoology

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“…Of these, 75 (57%) are the open-air type, which occupies an area of 482,000 m 2 , and 56 (43%) intensive (net-covered houses) type, which occupies an area of 93,000 m 2 . Generally, snail farming systems can be open field farms or covered constructions of different types [ 1 , 2 , 10 , 12 , 13 , 14 ]. The open-field system is extensive farming, where outdoor breeding and fattening take place.…”

Section: Introductionmentioning

confidence: 99%

An Assessment of Snail-Farm Systems Based on Land Use and Farm Components

Apostolou

Στάικου

Sotiraki³

et al. 2021

Animals

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In this study, the structural and management characteristics of snail farms in Greece were analyzed to maximize sustainable food production. Objectives, such as the classification of farming systems and assessing the effects of various annual production parameters, were investigated. Data were collected (2017) via a questionnaire, and sampling was conducted in 29 snail farms dispersed in six different regions (Thrace, Central Macedonia, West Macedonia, Thessaly, Western Greece, and the Attica Islands). Descriptive statistics for continuous variables and frequencies for categorical variables were calculated. The similarity between farms was analyzed using nonmetric multidimensional scaling (nMDS). The average farm operation duration exceeded eight months and the mean annual production was 1597 kg of fresh, live snails. Results recorded five farming systems: elevated sections (7%), net-covered greenhouse (38%), a mixed system with a net-covered greenhouse (10%), open field (38%), and mixed system with an open field (7%). Snail farms differ in the type of substrate, available facilities, and equipment (60% similarity between most of the open field farms). The geographical location of a farms’ settlement affects productivity but also influences the duration of operation, especially in open field farms, due to their operation under a wide assortment of climatic types.

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“…However, two additional possibilities were also tested: indoor hibernation of H. aspersa juveniles and indoor rearing of H. aspersa juveniles during wintertime. It is known that during hibernation, the gastropods' vital functions decrease to subsistence level [10,11] and the shell aperture is sealed with one or several epiphragms [12], allowing these terrestrial mollusks to survive in a stage of dormancy up to 4-6 months [13]. Indoor hibernation of mature snails, H. aspersa,in a controlled environment, temperature 2-6°C and humidity 70-80% [14], allows at least 80% of them successfully to pass overwinter [4].…”

Section: Introductionmentioning

confidence: 99%

Indoor Hibernation of Helix aspersa Juveniles

Drăghici¹,

Deheleana²,

Susan³

et al. 2020

Invertebrates - Ecophysiology and Management

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The "Italian" outdoor snailfarming technology assumes that both mature and juvenile snails hibernate outdoor, protected by a thin sheet of unweaved coverlet (agryl sheet). In contrast, the "French" snailfarming technology implies that only mature brown garden snails (Helix aspersa) hibernate indoor, in strictly controlled microenvironmental parameters (temperature, humidity, and ventilation). This technology may also be viable for H. aspersa juveniles. Extremely high death rates occurring in Romanian outdoor snailfarms during colder winters (>80%) imposed the need to find alternative paths for a proper hibernation of H. aspersa. Using statistical analyses, close surveillance of technological flow, and controlled microenvironmental parameters, we assessed the possibility to adapt indoor hibernation for H. aspersa juveniles. The experiments lasted for 2 years (2006)(2007)(2008) and were carried out on 34,000 H. aspersa juveniles and 15,000 mature ones, using different technological flows and microenvironmental parameters (temperature, humidity, and ventilation). They were performed in two stages and involved five case studies, conducted independently in three different locations: Floreşti (Mehedinţi county), Sântuhalm (Hunedoara county), and Muntenii de Sus (Vaslui county). The first stage tested the hypothesis in relation to survival rate of mature snails, H. aspersa,in the same conditions, whereas the second stage improved the technological flow, before its extensive application. We demonstrated that noncontrolled microclimate parameters (temperature, humidity, and ventilation) and the use of straw as hibernation support induced significant differences (P < 0.01) concerning death levels of H. aspersa juveniles as compared to their indoor hibernation in semicontrolled microclimate (temperature and ventilation). In the same hibernation microclimate, mature snails exhibited higher survival levels than the juvenile ones, irrespective of technological flow and origin (P < 0.0001). We also demonstrated that juveniles' weight loss displays a relatively constant variation (16.33-20.51%). In addition, the correlations between the individual average weight before and after hibernation were described by the same logarithmic regression. Furthermore, significantly higher survival rates of H. aspersa juveniles (P < 0.0001) have been registered when they had not been awakened during hibernation. Finally, we proved that indoor hibernation of H. aspersa juveniles in strictly controlled microenvironmental parameters (temperature, humidity, and ventilation) could represent a viable technology that improves the technological flow in outdoor snailfarming during wintertime in colder climates.

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Cited by 14 publications

References 3 publications

Activity and food intake of captivePlacostylus fibratus(Gastropoda: Bulimulidae) in New Caledonia

Activity and food intake of captivePlacostylus fibratus(Gastropoda: Bulimulidae) in New Caledonia

An Assessment of Snail-Farm Systems Based on Land Use and Farm Components

Indoor Hibernation of Helix aspersa Juveniles

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