Which one of the following fishes can produce electricity?

Options

A. Labeo
B. Torpedo
C. Scoliodon
D. All lung fishes

Answer

To determine which fish can produce electricity, we will analyze the options provided one by one:

1. **Labio (Rohita or Rohu fish)**: This is a freshwater fish and does not possess any electric organs. Therefore, it cannot produce electricity.

2. **Torpedo (Electric fish)**: This fish is known for its ability to generate electricity. It has specialized muscle cells known as electric organs that allow it to produce a weak electric field. This electric discharge can be used for predation or to avoid being preyed upon. Thus, the Torpedo fish is capable of producing electricity.

3. **Scoliotron (Shark)**: This is a cartilaginous fish, and it does not have any electric organs. Hence, it cannot produce electricity.

4. **Lungfish**: These fish have a modified swim bladder that functions similarly to lungs, but they do not have electric organs. Therefore, they cannot produce electricity.

Based on this analysis, the fish that can produce electricity is **Torpedo**.

### Steps Summary:
1. Identify the first fish (Labio) and check for electric organs - no.
2. Identify the second fish (Torpedo) and confirm it has electric organs - yes.
3. Identify the third fish (Scoliotron) and check for electric organs - no.
4. Identify the fourth fish (Lungfish) and check for electric organs - no.
5. Conclude that the only fish capable of producing electricity is **Torpedo**.