The correct answer is trout farming.
Trout are a type of fish that are native to cold, freshwater streams. They are a popular food fish and are also raised commercially for aquaculture. The coldwater streams of Himachal Pradesh are ideal for trout farming, as they provide the cool, clean water that trout need to thrive.
Shrimp are a type of shellfish that are native to both freshwater and saltwater environments. They are a popular food fish and are also raised commercially for aquaculture. However, shrimp farming requires warm, brackish water, which is not found in the coldwater streams of Himachal Pradesh.
Marine fishing is the practice of catching fish in the ocean. It is a major industry in many parts of the world, including India. However, marine fishing is not possible in the coldwater streams of Himachal Pradesh, as these streams are not connected to the ocean.
Crab farming is the practice of raising crabs for food. Crabs are a popular food fish and are also raised commercially for aquaculture. However, crab farming requires warm, brackish water, which is not found in the coldwater streams of Himachal Pradesh.
In conclusion, the coldwater streams of Himachal Pradesh are suitable for trout farming.