here are several ways to keep fish for a long time without the use of chemicals or refrigeration. One of the easiest ways is to dry the fish.

Drying fish is an ancient preservation method that has been used for centuries. It involves removing the moisture from the fish, which makes it less hospitable to bacteria and other microorganisms that cause spoilage. Dried fish can last for months and even years if stored properly.

Here are the steps to dry fish:

1. Clean the fish thoroughly, removing scales and guts.
2. Cut the fish into pieces, if desired. Smaller pieces will dry faster.
3. Salt the fish generously. The salt will help draw out the moisture.
4. Leave the fish to dry in a sunny and well-ventilated area. This can take several days, depending on the size of the fish and the weather conditions.
5. Turn the fish over once a day to ensure even drying.
6. Once the fish is completely dry, store it in an airtight container in a cool, dry place.

Dried fish can be eaten as a snack or used in recipes. It’s important to note that dried fish is high in sodium, so it’s best to consume it in moderation.

Another method to preserve fish is smoking. Smoking fish involves exposing it to smoke from burning wood or other materials. This imparts a smoky flavor and also helps to preserve the fish. Smoked fish can last for several weeks if stored properly.

To smoke fish:

1. Clean the fish thoroughly, removing scales and guts.
2. Salt the fish generously.
3. Hang the fish in a smoking chamber, or place it on a wire rack.
4. Light a fire in the smoking chamber, using wood chips or other smoking materials.
5. Smoke the fish for several hours, until it’s cooked and has a smoky flavor.
6. Once the fish is smoked, store it in an airtight container in a cool, dry place.

Smoked fish can be eaten as is or used in recipes. It’s important to note that smoked fish can be high in sodium and should be consumed in moderation.