Question

how can u differentiate btw aquaculture;mariculture;andcapture fishery

Answer 1

aquaculture : the rearing and breeding of fish in tanks , canals or pond is termed as aquaculture .
mariculture: the practice of cultivating marine fish is termed as mariculture. 
capture fishery: it refers to all kinds of harvesting of naturally occurring living resources in both marine and fresh water environments.
                                                 i hope that this will help u. 
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Answer 2

Aqua culture:
Aqua culture is the method where fishes are feed and grown in fresh and clean water.

Mariculture:
Mariculture is the method of culturing fish in marine water or salt water.

Capture fishery:
It is a method where the fishes from various water bodies like ocean,sea,river,lake etc and cultivated.