The fecundity of a mud snail, <i>Cipangopaludina japonica</i>

Taki, Akio

doi:10.1080/03680770.1980.11897251

Cited by 5 publications

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“…It is used in cooking and relished for its flavor. So far a feu, st,itdies have been made on the ecaology ancl biology of this species (TAKI 1981, JOKINEN 1984 Even t,liough ricefields in Japan proyide a very s i i it.ahle habitat for the niiid snail, it has alniost completely disappeared from rice growing regions in tlie last 20 years as a result of modern agriciiltiiral pra(:tices. This consists of excessive applicat.ions of chemic:als, tlie introduct,ion of heavy machinery and leaving the land dry for rather long periods.…”

Section: Introductionmentioning

confidence: 99%

Ecology of Some Ricefields in Japan as Exemplified by Some Benthic Fauna, with Notes on Management

Kurihara

1989

Intl Review of Hydrobiology

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The role of tubificids and mud snails in the ricefield ecosystem was elucidated using their ecology as a basis for highlighting problems in the strategy of recycling between agricultural and urban activities.Tubificid oligochaetes occur in high densities in ricefields where irrigation water is polluted with sewage, high organic matter content is present in the soil and when highly toxic insecticides are not used. High tubificid densities reduce and even eliminate weeds, change the composition and density of bacteria and increase the density of zooplankton. Also they serve as a high quality source of food for fish comparable to that of insects. Conditions t h a t promote a healthy growth of tubificids obviate or reduce the need for weedicides and high levels of inorganic fertilizers.Mud snails which thrive in ricefields have been used as an important source of protein food for humans in rural Japan. The snails can consume a sludge-reed compost mixture used as a fertilizer in ricefields. However the high heavy metal content in the sludge is accumulated by the snails which are thus unfit for human consumption. Based on these results and the known ecology of tubificids and the snails, a possible recycling system comprising sewage sludge, reeds, fish, insects and egrets using these two kinds of benthic organisms is proposed.

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Section: Introductionmentioning

confidence: 99%

Ecology of Some Ricefields in Japan as Exemplified by Some Benthic Fauna, with Notes on Management

Kurihara

1989

Intl Review of Hydrobiology

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Sheldon

Walker

1997

Hydrobiologia

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Reproduction of Viviparus viviparus (Linnaeus, 1758) in the mid and lowers ections of the Narew River

Augustyniak¹

2002

Folia Malac.

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The population of V. viviparus (L.) was studied at 16 sites situated along the mid and lower sections of the Narew River, with respect to the population density, sex ratio, size structure and fecundity. The density ranged from 50 to 600 indiv./m 2 . The females comprised 53-90% of population, and represented mainly the largest size classes (III and IV), while most of the males were of size class II. The smallest snails (class I) were found only among the males (up to 50%). In all the sites gravid females predominated, being the most abundant in size class IV (80%-100%). The average number of embryos per female was 18 (range 1-59) and increased with the shell height and body mass.

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The fecundity of a mud snail, Cipangopaludina japonica

Cited by 5 publications

References 0 publications

Ecology of Some Ricefields in Japan as Exemplified by Some Benthic Fauna, with Notes on Management

Ecology of Some Ricefields in Japan as Exemplified by Some Benthic Fauna, with Notes on Management

Untitled

Reproduction of Viviparus viviparus (Linnaeus, 1758) in the mid and lowers ections of the Narew River

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