The effect of high juvenile fish stocking density on FZT transmission
may be due to it's direct negative impact on intermediate host snails, i.e.
either predation or damage due to interference caused by fish probing
various objects in the water in searching for food. Giant gourami is not
a molluscivore, but is omnivorous and feeds on both plants and animals,
including aquatic plants, fish, frogs, zoobenthos (insect larvae, crustaceans
annelids) and sometimes even dead animals (Fishbase, www.
fishbase.org). Especially juvenile snailsmight be sensitive to such interference
or in the case of Bithynia spp., giant gourami inadvertently
might consume eggs attached to vegetation. However, other factors
can be important, e.g. although the number of cercariae-fish contacts
might increase with stocking density, cercariae could be diluted over
more fish. This might be important if cercariae production within the
pond is a limiting factor for infection in fish.
The effect of high juvenile fish stocking density on FZT transmissionmay be due to it's direct negative impact on intermediate host snails, i.e.either predation or damage due to interference caused by fish probingvarious objects in the water in searching for food. Giant gourami is nota molluscivore, but is omnivorous and feeds on both plants and animals,including aquatic plants, fish, frogs, zoobenthos (insect larvae, crustaceansannelids) and sometimes even dead animals (Fishbase, www.fishbase.org). Especially juvenile snailsmight be sensitive to such interferenceor in the case of Bithynia spp., giant gourami inadvertentlymight consume eggs attached to vegetation. However, other factorscan be important, e.g. although the number of cercariae-fish contactsmight increase with stocking density, cercariae could be diluted overmore fish. This might be important if cercariae production within thepond is a limiting factor for infection in fish.
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