In fishes the kidney is

Options

A. Pronephric
B. Metamorphic
C. Mesonephric
D. Nephridial

Answer

### Step-by-Step Solution:

1. **Identify the Type of Organ**:
- The question asks about the type of kidney found in fishes. The kidneys are excretory organs responsible for the removal of waste products from the body.

2. **Understand the Waste Excretion in Fishes**:
- Fishes primarily excrete ammonia as their nitrogenous waste. This is because they are aquatic animals and have access to large amounts of water, which helps dilute the toxic ammonia.

3. **Determine the Kidney Type**:
- The types of kidneys mentioned in the options are pronephric, metamorphic, mesonephric, and nephredial.
- In fishes, the kidneys are classified as mesonephric. This means that the mesonephric kidney serves as the main excretory organ in these aquatic vertebrates.

4. **Development of the Kidney**:
- The mesonephric kidney in fishes arises from the pronephric stage. The pronephric kidney is the first stage of kidney development, which then develops into the mesonephric kidney in fishes.

5. **Conclusion**:
- Therefore, the correct answer to the question is that in fishes, the kidney is **mesonephric**.

### Final Answer:
In fishes, the kidney is **mesonephric**.

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