In the fish recognition task, you can see that the length, weight, fish color, as well as the boat color may vary, and there could be shadows, images with low resolution, and other objects in the image. All these issues affect the significance of the proposed explanatory features that should be informative about our fish classification task.

Work-arounds will be helpful in this case. For example, someone might think of detecting the boat ID and mask out certain parts of the boat that most likely won't contain any fish to be detected by our system. This work-around will limit our search space.