What is a common fining agent derived from fish swim bladders?

Isinglass is a traditional fining agent specifically derived from the swim bladders of fish, particularly sturgeon. It is utilized in the brewing and winemaking processes to clarify the final product by promoting the aggregation and precipitation of particles, including yeast and other suspended solids. This results in a clearer appearance and often improves the overall palate of the beverage.

The usage of isinglass dates back centuries and is valued for its effectiveness in removing haze and unwanted materials without imparting flavors or colors to the beverage. Its fining properties are often preferred for certain styles of beer and wine where clarity is highly sought after.

In contrast, other choices focus on different sources or types of fining agents. Gelatin, while effective for clarifying, is not fish-derived, making it a different category altogether. Whirlfloc is a synthetic product containing carrageenan and is commonly used in the brewing process but does not come from fish. Polyclar is a brand of synthetic and non-animal-derived fining agents like polyvinylpolypyrrolidone, which works differently than isinglass and is suitable for vegan applications. Thus, isinglass stands out in this context as the specific fining agent with a direct link to fish swim