If he had 200 fish and sells 50, he is left with 200 - 50 = <<200-50=150>>150 fish

If a third of them get spoiled 1/3 * 150 = <<150*1/3=50>>50 fish get spoiled

The remaining number of fish is now 150 - 50 = <<150-50=100>>100

He then gets 200 more to make 100 + 200 = <<100+200=300>>300 fish

# Answer

300
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Steve owns a lake shop that sells fish. He has a stock of 200 fish. He sells 50 fish and because his refrigerators stop working a third of the remaining fish become spoiled. A new stock of 200 more fish arrives. How many fish does he have in stock now?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
300
Steve owns a lake shop that sells fish. He has a stock of 200 fish. He sells 50 fish and because his refrigerators stop working a third of the remaining fish become spoiled. A new stock of 200 more fish arrives. How many fish does he have in stock now?
train