A sponge harmful to oyster industry is

Spongilla

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Euspongia

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Hyalonema

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Cliona

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Solution

The correct option is D Cliona
A. Spongilla is a freshwater sponge found in water streams and lakes
B. Euspongia is a marine sponge and is of commercial value
C. Hyalonema is a free living and marine sponge also known as glass rope sponge
D. Cliona is a genus of demosponge. It gets attached to the oysters shells and causes holes in them. Due to this, the organisms inside the shells die. Hence, Cliona is harmful to oyster industry
So, the correct answer is 'Cliona'

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