What are the various undesirable species in a shrimp pond and how can they be controlled?

Describe two bacterial diseases of fishes in culture. How can an outbreak of a disease be prevented in a fish culture?

Diagrammatically depict the principal horizontal and vertical zones of the marine environment. (No description required)

Discuss the effect of salinity on the organisms inhabiting a marine environment. How do they osmo-regulate in this environment?

Describe the various techniques for isolating micro-algae for culture.

Give a brief account of culture conditions and two commonly used growth media for culturing micro-algae.

Name four important cultivable species for shrimp culture. Compare the traditional systems of shrimp farming with that of extensive and intensive systems.

Explain with a suitable diagram, the layout of a brackish water farm for shrimp culture.

5. Write short notes on any two of the following:

Artificial diets for shrimp larvae

Mabe pearls

Induced breeding in fishes

Discuss the various methods of culturing milk fish.

How are mud crabs harvested and packed for export purposes

7. What are seaweeds? Give a detailed account of commercially important products obtained from various species of seaweeds.