The first one, I think, is a common/striped shiner but it has no lines on its back.
![Posted Image](http://img4.sellersourcebook.com/users/42439/6_1380402615.jpg)
![Posted Image](http://img4.sellersourcebook.com/users/42439/7_1380402617.jpg)
![Posted Image](http://img4.sellersourcebook.com/users/42439/8_1380402601.jpg)
The next is a Round Goby and what I want to know is if it has the dot on the dorsal fin, does that mean it is definitely a Round Goby?
![Posted Image](http://img4.sellersourcebook.com/users/42439/2_1380402604.jpg)
And last, I am not quite sure...
![Posted Image](http://img4.sellersourcebook.com/users/42439/019.jpg)
![Posted Image](http://img4.sellersourcebook.com/users/42439/4_1380402608.jpg)
![Posted Image](http://img4.sellersourcebook.com/users/42439/3_1380402606.jpg)
.