In fishes the kidney is

Options

A. Pronephric type
B. Mesonephric type
C. Metanephric type
D. Nephridial type

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about the type of kidney found in fishes.

2. **Understand Kidney Types**: There are three main types of kidneys in vertebrates:
- Pronephric
- Mesonephric
- Metanephric

3. **Focus on Fish**: In fishes, the kidney type that is primarily present is the mesonephric kidney.

4. **Define Mesonephric Kidney**: The mesonephric kidney serves as the excretory organ in aquatic vertebrates, including fishes. It is considered a temporary kidney in some other vertebrates like reptiles and birds.

5. **Developmental Stages**: The mesonephric kidney develops from the pronephros, which is the first stage of kidney development. The metanephric kidney, which is the permanent kidney, develops from the mesonephros.

6. **Eliminate Incorrect Options**:
- Pronephric: This is the first stage and is not present in adult fishes.
- Metanephric: This is the permanent kidney type and is not found in fishes.
- Nephridial: This type is associated with invertebrates like earthworms.

7. **Conclusion**: The correct answer is that the kidney in fishes is of the mesonephric type.

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

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