This sentence describes the use of fish in different ingredients and recipes. Explained from the list of ingredients and production steps, this sentence means:

1. List of ingredients: Fish is one of the common ingredients in many recipes. Different dishes will use different kinds of fish, such as salmon, cod, perch, pomfret and so on. Although they are all fish, different fish species have different tastes and nutrients, so when cooking different dishes, you need to choose the right fish species according to the ingredient list.

2. Production steps: the cutting method, pickling method and cooking method of fish will be different in different dishes. For example, the production steps of steamed fish and braised fish are completely different. The former needs to keep the original shape of the fish, while the latter needs to cut the fish into pieces. In addition, different cooking methods will also affect the taste and nutrient retention of fish.

Generally speaking, this sentence shows that although different dishes use fish, different fish types and cooking methods should be selected according to different menu requirements.