How many pairs of gills are present in bony fishes?

Answer

**Step-by-Step Solution:**

1. **Understanding Bony Fishes**: Bony fishes are a class of fish known scientifically as Osteichthyes. They have a skeleton made of bone and are characterized by their gills, which are essential for respiration.

2. **Identifying the Number of Gill Pairs**: In bony fishes, the gills function as respiratory organs. Each gill is structured in a way that allows for efficient gas exchange.

3. **Example of a Bony Fish**: Taking the example of the fish known as "Labio" (or Labeo), we can observe the specific structure of their gills.

4. **Counting the Gill Pairs**: It is noted that Labio has approximately 4 pairs of gills. This means that for bony fishes in general, they typically possess 4 pairs of gills.

5. **Understanding Gill Structure**: Each gill consists of a double row of gill filaments, which are supported by structures known as gill arches. This anatomical structure aids in the respiratory function of the fish.

6. **Conclusion**: Therefore, the answer to the question is that bony fishes have 4 pairs of gills.

**Final Answer**: Bony fishes have 4 pairs of gills.

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