The correct answer is: a) Carp and tilapia.
Fish farming (aquaculture) is gaining importance in Mizoram with a focus on species like carp and tilapia. These species are well-suited to the climate and water conditions in Mizoram, and they are also popular with consumers. Carp and tilapia are both freshwater fish, and they can be grown in ponds, tanks, or cages. They are relatively easy to care for, and they are fast-growing. Carp and tilapia are also relatively low-cost to produce, which makes them a good option for small-scale farmers.
Sharks and rays are marine fish, and they are not well-suited to the climate and water conditions in Mizoram. They are also not popular with consumers in Mizoram. Seaweed and oysters are also marine organisms, and they are not well-suited to the climate and water conditions in Mizoram. They are also not popular with consumers in Mizoram. Ornamental fish are freshwater or marine fish that are kept as pets. They are not a major focus of aquaculture in Mizoram.