Search results
Results from the WOW.Com Content Network
The life cycle of a typical trematode begins with an egg. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The hatchling is called a miracidium, a free-swimming, ciliated larva. Miracidia will then grow and develop within the intermediate host into a sac-like ...
The life cycle of Dactylogyrus species is direct, having no intermediate host. The hermaphroditic adults are oviparous and produce eggs into the water which hatch prior to attaching to the gills of a fish host and developing into an oncomiracidium. [7] Adult Dactylogyrus lay about 4-10 eggs per day. [8]
Life cycle of Pasteuria ramosa a bacterial parasite of the cladoceran Daphnia magna. The diagram on the left shows the lifecycle of Pasteuria ramosa , a bacterial parasite of Daphnia . Susceptible hosts acquire the infection from spores in the sediment or in suspension.
Some fish are hermaphrodites, having both testes and ovaries either at different phases in their life cycle or, as in hamlets, have them simultaneously. Over 97% of all known fish are oviparous, [74] that is, the eggs develop outside the mother's body. Examples of oviparous fish include salmon, goldfish, cichlids, tuna, and eels.
The term jellyfish broadly corresponds to medusae, [4] that is, a life-cycle stage in the Medusozoa. The American evolutionary biologist Paulyn Cartwright gives the following general definition: Typically, medusozoan cnidarians have a pelagic, predatory jellyfish stage in their life cycle; staurozoans are the exceptions [as they are stalked]. [14]
Mosquitofish feed on mosquito larvae at all stages of life, if mosquito larvae are available in the environment. Adult females can consume up to hundreds of mosquito larvae in one day. [3] Maximum consumption rate in a day by one mosquitofish has been observed to be from 42%–167% of its own body weight. [19]
For its life cycle to be complete, Clinostomum marginatum requires two intermediate hosts (snail and fish or frog) and one definitive host (bird). The life cycle begins when eggs hatch in the water. The miracidia swims and invades the foot of a snail of the genus Helisoma. They will die in several hours if they cannot find the snail host.
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...