Alimentação e fecundidade de planorbídeos criados em laboratórios: IV - Helisoma duryi (Wetherby, 1879). (Pulmonata, Planorbidae)

Milward-de-Andrade, Roberto; Maruch, Sandra Maria; Costa, Maria Joana Oliveira da

doi:10.1590/s0034-89101978000100010

Cited by 2 publications

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“…It can be concluded that addition of a protein-rich food type is essential for maximizing egg production . This has also been demonstrated for other species (Jennings et al 1970 ;Milward-de-Andrade et al 1978) . Stanislawski & Becker (1979) found a drastic reduction of egg laying in B. glabrata fed on carbohydrate diet, which was protein-and lipidfree, and they suggested that snails are dependent on essential nutritive substances such as protein and/ or lipids to sustain normal metabolic activity .…”

Section: D) Food Typesupporting

confidence: 68%

The effect of temperature, darkness, starvation and various food types on growth, survival and reproduction of Helisoma duryi, Biomphalaria alexandrina and Bulinus truncatus (Gastropoda: Planorbidae)

El-Emam

Madsen

1982

Hydrobiologia

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Helisoma duryi has been proposed as a biological control agent in schistosomiasis due to its superiority in laboratory competition experiments with various species of the intermediate host snails . Therefore it was considered important to evaluate the response of this snail species and the intermediate host species, Biomphalaria alexandrina and Bulinus truncatus, to various physical, chemical and biological factors under laboratory conditions in order to obtain information on the similarities in the ecological niches of these species . The factors considered in the present paper are : temperature, darkness, starvation and food . All three species had optimal growth and egg laying at 26-28 ° C . Only H. duryi survived for a longer period at 33 ° C and it was capable of starting egg laying at this temperature although the onset was delayed . However, low temperature (18 'C) caused a relatively larger decrease in egg laying of H. duryi than in the other two species . Growth and egg laying was reduced for H. duryi and B. truncatus kept under darkness and B. alexandrina could not tolerate maintenance under darkness . A few days of starvation of juvenile snails had no effect on later growth and egg laying capacity of the survivors, although mortality in B. truncatus was increased . B . alexandrina had a lower tolerance to starvation than the other two species . Egg laying of snails fed only one of the three laboratory food types decreased for all three species in the order : Vov-vov (dog food in dry pellets), Tetramin (fish food) and lettuce . Combinations of lettuce and one or more proteinaceous food types gave optimal growth and egg laying for all three species .

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Section: D) Food Typesupporting

confidence: 68%

The effect of temperature, darkness, starvation and various food types on growth, survival and reproduction of Helisoma duryi, Biomphalaria alexandrina and Bulinus truncatus (Gastropoda: Planorbidae)

El-Emam

Madsen

1982

Hydrobiologia

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INFLUENCE OF FOOD TYPE AND CALCIUM SUPPLEMENTATION ON GROWTH, OVIPOSITION AND SURVIVAL PARAMETERS OF Biomphalaria glabrata AND Biomphalaria straminea

et al. 2020

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Schistosomiasis is a parasitic disease caused by Schistosoma mansoni whose intermediate host is the snail of the genus Biomphalaria. This snail is geographically widespread, making the disease a serious public health problem. The purpose of this study was to analyze the growth, reproductive rates and mortality of B. glabrata and B. straminea in different calcium concentrations and food types. Freshly hatched snails stored in aquariums under different dietary and calcium supplementation programs were studied. Under these conditions, allplanorbids survived, so there was no mortality rate and 79,839 eggs of B. straminea and 62,558 eggs of B. glabrata were obtained during the 2 months of oviposition. The following conditions: lettuce + fish food and lettuce + fish food + powdered milk resulted in the highest reproductive rates. In addition, supplementation with calcium carbonate and calcium sulfide in three different concentrations did not significantly influenced the amount of eggs or ovigerous masses. Thus, this study shows that changes in diet are crucial for the survival/oviposition of these planorbids, being an important study tool for population control. Calcium is also akey factor in these conditions, but more work is necessary to better assess its effect on snail survival.KEY WORDS: Laboratory breeding; Biomphalaria glabrata; Biomphalaria straminea; food type; calcium concentration.

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Alimentação e fecundidade de planorbídeos criados em laboratórios: IV - Helisoma duryi (Wetherby, 1879). (Pulmonata, Planorbidae)

Cited by 2 publications

References 0 publications

The effect of temperature, darkness, starvation and various food types on growth, survival and reproduction of Helisoma duryi, Biomphalaria alexandrina and Bulinus truncatus (Gastropoda: Planorbidae)

The effect of temperature, darkness, starvation and various food types on growth, survival and reproduction of Helisoma duryi, Biomphalaria alexandrina and Bulinus truncatus (Gastropoda: Planorbidae)

INFLUENCE OF FOOD TYPE AND CALCIUM SUPPLEMENTATION ON GROWTH, OVIPOSITION AND SURVIVAL PARAMETERS OF Biomphalaria glabrata AND Biomphalaria straminea

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