In fishes the kidney is

Options

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

Answer

To answer the question "In fishes, the kidney is:", we can follow these steps:

### Step 1: Understand the Types of Kidneys
Fishes have different types of kidneys based on their evolutionary stage. The main types are:
- Pronephric
- Mesonephric
- Metanephric

### Step 2: Identify the Correct Type for Fishes
In fishes, the type of kidney present is the mesonephric kidney. This is because:
- Mesonephric kidneys are characteristic of many aquatic vertebrates, including fishes.
- They develop from the pronephric stage during the embryonic development of the fish.

### Step 3: Eliminate Incorrect Options
Now, let's analyze the options given:
- **Pronephric**: This is the first stage of kidney development but is not the type found in adult fishes.
- **Metanephric**: This type is found in higher vertebrates, such as mammals, and is not present in fishes.
- **Mesonephric**: This is the correct option as it is the type of kidney found in fishes.
- **Nephredian**: This is not a recognized type of kidney in vertebrates.

### Conclusion
The correct answer is **mesonephric**.

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