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Modification in parasitic life style:

Reduction in locomotion appendages

Develop attachment structures

Increase size and proportions of reproductive structures

Fusion of body somites

Reduction of sense organs

Reduction in number of instars that are free living

Why do these modifications take place? Explain a reason for each.
Use the given modifications and apply it to the description of a species of Copepoda

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Fill in the gaps:
These organisms parasitize freshwater _____ and_______. Are they of economic importance? Why? The ________ of the parasite anchors to the hosts ____. Therefore they damage the scales on the hosts body and also causes _______, ulceration,_______ and fungal infections. Small fish can die due to heavy infestations, they are especially a threat in hatcheries.

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Please describe the lifecycle of Lernaea cyprinacea in detail

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Visually identify the female on the host organism

Effect on feeding of the fish due to buccal cavity infection

Use organophosphate as a control method

A dip in potassium permaganate can also kill the females

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Most common copepods that infect fish. They have primarily freshwater hosts but can parasitize marine species as well. Only the females are parasitic. Sensory organs= antennules and antennae. Females usually attach to gills of the fish host using their antennae. Describe how these antennae are modified.

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Please describe Argasilus's life cycle in detail according to the figure below

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What do infestations of Argasilus on the gills of fish cause? Do epozootics occur?

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No freeliving life stages. Larger is size than free-living groups. Can attach to various areas of the host. Please name these areas.

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Please describe their life cycle in detail

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Fill in the gaps:
common genus. Adults are able to swim. Dorso-venterally flattened. They have ____ pairs of antennae._________ are used to maintain position of the host and clean other appendages. The number of thoracic segments are _____. They also have _______ pairs of swimming legs. _______ form, with flagellum on firts two pairs.

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Not host specific

Mating takes place on host

Females deposit eggs on other substrate than the host

No ovisacs

Eggs hatch releasing larvae

Larvae then fins a host organism and undergo multiple molts before becoming an adult

Increased temperatures make eggs hatch faster

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Morphology:
Parasites of decapods (crabs). Adults do not resemble arthropods, they have no appendages. Nutriets obtained from root-like processes ramifying through the tissues of the crab host

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This parasite makes male crabs think that they're pregnant females. Subscribe! http://bit.ly/1FkxVLb ‖ Twitter! https://twitter.com/gross_science ‖ Tumblr! http://grossscience.tumblr.com/ ↓Want more info?↓ The Smithsonian Environmental Research Center's on-going study on Loxothylacus panopaei: http://bit.ly/1JyRsbQ Credits: Host, Writer, Animator, Editor Anna Rothschild DP, Sound, Researcher, Intern Extraordinaire Kristen Clark Many thanks to Monaca Noble and Amy Fowler.

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Please describe the life cycle in detail

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Describe why these parasites are economically important. How do they alter their host organisms?

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Order: Isopoda
Morphology:
Fill in the gaps:
They are divided into three main regions: head, _______ and________. They also have a ________thorax. They have _____ pairs of antennae,_____ thoracic segments each with a pair of limbs,______segmented abdomen, first _____ with pleopods. What are pleopods?Dorsally overlapping plates are present.

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Parasites of fish
Burrow under the scale of the fish host. Skin stretches to accommodate the growing Isopod. Communicates to the exterior through a small hole.

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What are the effects on their fish host?