Dumping is defined as the act of selling a commodity in another country at a price below the cost of its production  Shrimp producers in country H are selling river prawns in country M at a price lower than the cost of producing the prawns in country M
So the shrimp producers in country H are dumping shrimp in country M
If country H keeps selling shrimp in country M at a price lower than country M's shrimp production cost, country M's shrimp industry will go bankrupt