Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 马克有3个装有孕鱼的鱼缸。每个鱼缸里有4条孕鱼，每条鱼会生20条小鱼。最后他有多少条小鱼？


### Response:
 他有4*3=<<4*3=12>>12条孕鱼。
这意味着他们会生12*20=<<12*20=240>>240条鱼。