Three carp fishes, Catla, Labeo and Cirrhina, can be grown together in the same pond more economically as they have :

Options

A. Positive interactions commensalism
B. Commensalism
C. Symbiosis
D. No competition for food

Answer

To solve the question regarding why Catla, Labeo, and Cirrhina can be grown together in the same pond more economically, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Fishes**: Recognize that Catla, Labeo, and Cirrhina are three different species of carp fish. Each species has its own feeding habits and ecological niches.

**Hint**: Research the feeding habits of each fish species to understand their dietary preferences.

2. **Analyzing Interactions**: The question presents four types of interactions: positive interactions, commensalism, symbiosis, and competition. We need to determine which of these applies to the three fish species.

**Hint**: Recall the definitions of each interaction type to identify their characteristics.

3. **Defining Commensalism**: Commensalism is a type of interaction where one species benefits while the other is neither helped nor harmed. This does not apply to our situation since we are looking for a scenario involving three species.

**Hint**: Consider whether one fish benefiting at the expense of another fits the scenario.

4. **Defining Symbiosis**: Symbiosis involves mutual dependence where all species benefit from the interaction. This is not applicable here as the three fish do not necessarily rely on each other for survival.

**Hint**: Think about whether the fishes rely on each other for food or other resources.

5. **Defining Competition**: Competition occurs when species vie for the same resources, leading to one benefiting at the expense of another. This is a negative interaction and does not describe the relationship among these fish.

**Hint**: Reflect on whether the fish compete for the same food sources.

6. **Identifying the Correct Answer**: The key to growing these fish together economically is that there is **no competition for food**. Each fish species has different dietary needs, allowing them to coexist without competing for the same resources.

**Hint**: Consider how different feeding strategies can allow multiple species to thrive in the same environment.

### Final Answer:
The three carp fishes, Catla, Labeo, and Cirrhina, can be grown together in the same pond more economically because they have **no competition for food**.