Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichild fish in the lake Victoria of E.Africa ?
(a) Catla catla
(b) Dog fish
(c) Nile perch
(d) African catfish

Options

A. Catla catla
B. Dog fish
C. Nile perch
D. African catfish

Explanation

To solve the question regarding which fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in Lake Victoria, we can follow these steps:

### Step 1: Understand the Question
The question asks for a specific fish species that caused the extinction of over 200 cichlid fish species in Lake Victoria.

### Step 2: Analyze the Options
We have four options to consider:
- (a) Catla catla
- (b) Dog fish
- (c) Nile perch
- (d) African catfish

### Step 3: Recall Relevant Information
From biological studies, we know that Lake Victoria has faced ecological challenges due to the introduction of non-native species. One of the most significant impacts has been from a particular fish species that preys on native fish.

### Step 4: Identify the Invasive Species
The Nile perch (Lates niloticus) was introduced to Lake Victoria in the mid-20th century (around the 1950s-1960s). This fish is known to be a powerful predator and has significantly affected the native cichlid populations.

### Step 5: Conclude the Answer
Given that the Nile perch is recognized as the invasive species responsible for the decline of the cichlid fish population in Lake Victoria, the correct answer is:
**(c) Nile perch**

### Final Answer
The fish that led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in Lake Victoria is (c) Nile perch.

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