Which of the following characteristics does not belong to Labeo ( Rohu ) ?

Options

A. Streamline body
B. operculate gills
C. air bladder absent
D. terminal mouth

Answer

To determine which characteristic does not belong to Labeo (Rohu), we will analyze each of the given options:

1. **Streamlined Body**:
- Labeo, like many fish, has a streamlined body shape which helps in reducing water resistance while swimming. This characteristic is typical of many fish species, including Labeo.

2. **Copper Plate Gills**:
- The term "copper plate gills" is not a standard term used in ichthyology (the study of fish). Labeo has gills, but they are not specifically referred to as "copper plate gills." This term may be misleading or incorrect in the context of Labeo.

3. **Air Bladder Absent**:
- Labeo, being a bony fish (Osteichthyes), possesses an air bladder. This organ helps in buoyancy control. Therefore, the statement that the air bladder is absent is incorrect.

4. **Terminal Mouth**:
- Labeo has a terminal mouth, which is a characteristic of many fish species. This feature allows them to feed effectively.

Based on the analysis, the characteristic that does not belong to Labeo (Rohu) is:

**Answer: Air bladder absent (Option 3)**