0 : Bacterial Red disease
1 : Bacterial diseases - Aeromoniasis
2 : Bacterial gill disease
3 : Fungal diseases Saprolegniasis
4 : Healthy Fish
5 : Parasitic diseases
6 : Viral diseases White tail disease

Resource link:
https://www.kaggle.com/code/ahmadjaved097/multiclass-image-classification-using-cnn