Direct life cycle. Nematode can infect fish directly without the need for an intermediate host.
Do roundworms have an intermediate host?
Nematodes (roundworms) are free-living in the intestines. Roundworms do not require an intermediate host to spread from dog to dog, but can be transmitted from dog to dog via infective eggs shed in the feces.
Do roundworms need a host?
Parasitic roundworms may have plant, vertebrate, or invertebrate hosts. Several species have human hosts. For example, hookworms, like the one in Figure below, are human parasites. They infect the human intestine.
Do roundworms need a host to survive?
Roundworms are parasites — organisms that need to live on or in another creature to survive. Often, the parasite causes problems for its host (creature it depends on). For roundworms, they need the body of humans or other animals to mature into egg-laying adults.
What is the primary host of roundworm?
Etiology: Ascaris lumbricoidesis the largest and, globally, the most widespread of all human intestinal roundworms (Nematode). Life cycle: Human is the definitive host.
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