Estudo comparativo do aparelho reprodutor do molusco Achatina fulica criado em cativeiro e asselvajado / Comparative study on the reproductive system in mollusk Achatina fulica raised in captivity and in the wild

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

120 land snails of the species Achatina fulica were arranged into four groups according to situation in which the first group was collected from the heliciculture site (LAB) at the Heliciário Experimental Professora Doutora Lor Cury – FMVZ/USP and the other three groups, made up of wild individuals, were collected from a vegetable garden (DPE), a land lot with fruit crop (MBA) and an empty walled lot containing waste material (CJA), in a urban area in Pirassununga, São Paulo state, Brazil. The animals were slaughtered through freezing and assessed externally and internally. The external assessment included body weight and shell length and width measurements. For the internal evaluation, the carcass was fragmented into shell, meat, prostate/uterus gland, albumen/ovotestis gland, egg clutches and number of eggs. Besides total weight of fragments, the percentages of fragment weight in relation to body weight were considered. The experiment drawing used was totally at random where each group of animals from each site was considered what we named of situation, and each animal was taken as a sample unit. For mean comparisons and possible correlations among variables it was used the analysis of variance and the Test-t (Tukey). The obtained results were significant for external assessment where the higher mean values were found in the situation LAB (52,63g mean weight, 76,28mm shell length and 43,96mm shell width), and the situation CJA (31,48g mean weight, 68,71mm shell length and 37,17mm shell width) corresponding to the lower limit. The results for mean shell weight were the same between the situations LAB (12,88g) and CJA (11,64g), but different in DPE (5,87g) and MAB (0,57g). There were differences in the percentage assessment where results of a higher value for the rate shell/carcass in CJA were found, followed by the other situations results. The obtained result in LAB (10,04g) was higher than in DPE (6,26g), MAB (5,92g) and CJA (6,49g) situations for mean meat weight. However, there was no significant difference found for mean carcass meat rate. The prostate gland mean weight was higher in LAB (1,29g) and a lower limit was shown in CJA (0,45g); these results were similar for the albumen gland. However, higher values were found for mean total amount between glands and egg clutches in LAB situation (11,89g) when compared to the lower limit in CJA (2,04g). The rates for external assessment were linear and significant. The prostate gland showed a positive correlation to body weight, shell length and width, and albumen gland, which in turn showed only a correlation to the variables related to the reproductive system

ASSUNTO(S)

reproductive system aparelho reprodutor achatina sp molusco controle erradicação mollusk eradication achatina sp control

ACESSO AO ARTIGO

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