Aspects of the Life Cycle, Population Dynamics,growth and Secondary Production of the Edible Snail Helix Lucorum Linnaeus, 1758 (Gastropoda, Pulmonata) in Greece

Στάικου, Αλεξάνδρα; Lazaridou‐Dimitriadou, M.; Farmakis, Nikolaos

doi:10.1093/mollus/54.2.139

Cited by 69 publications

(42 citation statements)

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“…obvoluta grows from hatching till lip formation and sexual maturation, like other helicids (WOLDA 1970, DZIABASZEWSKI 1975, STAIKOU et al 1988, HELLER & ITTIEL 1990, BAUR B. 1990b, BAUR A.…”

Section: Growthmentioning

confidence: 98%

“…1995), Lauria cylindracea (HELLER et al 1997), Alinda biplicata (KUZNIK-KOWALSKA 1998a), Vestia elata (PIECHOCKI 1982), Bradybaena fruticum (STAIKOU et al 1990), Arianta arbustorum (TERHIVOU 1978-populations from Finland, BAUR B. & RABOUD 1988 or species of the genus Helix (DZIABASZEWSKI 1975, KILIAS 1985, STAIKOU et al 1988, HELLER & ITTIEL 1989, KORALEWSKA-BATURA 1999.…”

Section: Life Cyclementioning

confidence: 99%

See 1 more Smart Citation

Life cycle and population dynamics of Helicodonta obvoluta (O. F. Müller, 1774) (Gastropoda: Pulmonata: Helicidae)

Maltz¹

2003

Folia Malac.

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Life cycle of Helicodonta obvoluta (O. F. Müll.) was studied in the field and in laboratory. Mating lasts 2-3 hrs and includes: meeting of the partners, recognition, courtship dance, copulation, resting phase and parting. No spermatophores were observed upon dissection of a total of 90 adult individuals which seems to indicate that H. obvoluta does not produce them. The egg-laying snail embeds anterior part of its body 4-6 mm deep in rotting timber. The egg-laying lasts from about a dozen hours to two days. Freshly laid eggs are white, calcified, slightly translucent and get opaque in a few days. They are slightly oval, of 2.10-2.85 mm major and 2.00-2.60 mm minor diameter. In laboratory, eggs are laid in spring (March-June) and autumn (August-November), in the field, the egg-laying periods are somewhat shorter (April-beginning of June, end of August-beginning of October). Most laboratory snails laid eggs only once in their lifetime, the maximum number of egg-laying periods was four. The percentage of hatching eggs in laboratory is ca. 59%. The number of eggs per clutch ranges from 9 to 27. The incubation period ranges from 14 to 31 days, and is shorter for spring (14-18 days) compared to autumn (19-23 days) clutches. Hatching is asynchronous, lasting from 1 to 4 days. With approaching hatching, the white colour of the egg disappears, so that the young snail is surrounded only by a translucent membrane, which gets broken as a result of its movements. Newly-hatched snails have shells of 1 whorl, devoid of periostracal hairs. No egg cannibalism was observed. Out of 174 young hatched in laboratory, 159 reached maturity. During numerous dissections of adult individuals no eggs were found in the reproductive tracts; if there is an egg-retention, it must be very short-lasting. Placing eggs in rotting timber and covering them with mucus protects them from drying-out, ensures a more favourable temperature and limits accessibility to predators. The number, relative and absolute size of eggs, number of clutches per year and per lifetime, and the life span seem to be correlated with size rather than with phylogenetic position of the species. No uniparental reproduction was observed. In laboratory the time elapsing between hatching and maturity (lip completely formed) ranged from 140 to 624 days; it varied between individuals hatched in particular years and seasons, e.g. young of the spring 1997 grew much faster (mean 354 days) than those of the spring 1999 (mean 442 days). The time required to reach full size was not correlated with the ultimate number of whorls. The growth shows three distinct phases: a quick initial phase of 3-4 months, a slow phase, and a short quick phase preceding lip formation. The monthly increment depends on the growth phase: 1.15 whorl in phases 1 and 3, 0.30 whorl in phase 2. The growth rate in the field is similar to that observed in laboratory, though with a wider scatter within growth phases and some differences between years and seasons. Depending on weather conditions, the youngest...

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Section: Growthmentioning

confidence: 98%

Section: Life Cyclementioning

confidence: 99%

Life cycle and population dynamics of Helicodonta obvoluta (O. F. Müller, 1774) (Gastropoda: Pulmonata: Helicidae)

Maltz¹

2003

Folia Malac.

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“…Gradually, they added coils to the shell as they grew and rate of growth depended to some extent on the abundance of food and weather conditions. H. lucorum were sexually mature three years after hatching when the largest diameter of their shell was equal to greater than 25 mm as reported by Ramzy (2009) and Staikou et al (1988). Staikou & Lazaridou-Dimitriadou (1990) found that M. cartusiana (M.) reached maturity within one year at a size of 8 -10 mm and could lay eggs immediately upon maturation.…”

Section: Biology Of Terrestrial Snailsmentioning

confidence: 52%

Biological and Ecological Studies on Land Snails and Their Control

Sallam¹,

El-Wakeil²

2012

Integrated Pest Management and Pest Control - Current and Future Tactics

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“…Sensitivity analysis showed that the enterprises were more sensitive to variations of selling price and less sensitive to those of feeding costs, a result particularly encouraging for intensive feeding systems with artificial diets [19]. Previous papers have posed the view that a diet only based on green vegetables does not offer a sufficient growth rate for the support of commercial snail farming, although these systems are very common in Mediterranean areas ( [11,20]). …”

Section: Discussionmentioning

confidence: 99%

Economic Analysis and Production Techniques of Snail Farms in Southern Greece

Hatziioannou¹,

Issari²,

Neofitou³

et al. 2014

WJAR

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In the present study was examined the economic viability and the production techniques of commercial snail farms, grounded in Peloponnese (Southern Greece). The primary data were collected through personal interviews from a sample of nine snail farms, during the years of 2009 and 2010. The farms produce fresh snails Cornu aspersum, raised and reproduced in net covered greenhouses with vegetation and artificial food provision. The impact of the production cost and the selling price on the business profitability was examined. A comparative presentation of profits and expenses was conducted for the economic viability control and the Net Present Value criterion was applied, as an indication of potential profitability of the investment plan. The net cash flows were estimated for a time period of ten years and sensitivity analysis was applied for a variation rate of 20% (with 5% as the discounting interest rate). The initial investment was 19.478 €, 60% of this concerns expenses for the creation of the net covered greenhouse. The annual revenue was estimated to 20.028€ during an average year (3 rd year) within the ten-year evaluation horizon. In the selling price of 5,3 €/kg the investment was deemed marginally economically viable. Problems which concerned mainly the design of the livestock installations but also the productions techniques were detected. Sensitivity analysis, demonstrated that the enterprise was sensitive to variations of the product's selling price (of fresh snails) and less sensitive to variations of feeding cost (of the green vegetables and artificial diet). Heliciculture has the potential to constitute an innovative and viable agricultural activity with economic, social and environmental benefits.

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Aspects of the Life Cycle, Population Dynamics,growth and Secondary Production of the Edible Snail Helix Lucorum Linnaeus, 1758 (Gastropoda, Pulmonata) in Greece

Cited by 69 publications

References 0 publications

Life cycle and population dynamics of Helicodonta obvoluta (O. F. Müller, 1774) (Gastropoda: Pulmonata: Helicidae)

Life cycle and population dynamics of Helicodonta obvoluta (O. F. Müller, 1774) (Gastropoda: Pulmonata: Helicidae)

Biological and Ecological Studies on Land Snails and Their Control

Economic Analysis and Production Techniques of Snail Farms in Southern Greece

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