Question

Which of the following is called the surface feeder?
A. Catla
B. Rohu
C. Mrigal
D. Grass carp

Answer 1

Hint:Since fishes are the most predominant aquatic vertebrates they have to satisfy their nutritional requirements from the food they consume from the aquatic environment. Most fishes subsist on plants and animals available in their habitats, but some utilize debris along with associated organisms. Since the feeding habits of fishes vary according to the type of food present in a particular habitat.

Complete answer:Catla- Catla is one of the renowned and fastest-growing major carps. It is non-predatory. It is mainly found in the Padma, Meghna, Buriganga Rivers of Bangladesh. It has a wide body, a long head, the lower lip is smooth and fat, black-gray in color, sides are silver and has a light pink color. It takes its food from the upper layer of the water so surface and side vegetation are very helpful for its growth.
Rohu- Rohu is the major Indian carp which is found in Southern Asia and it is very important. This fish is also called Tapra. It mainly eats left waste material and rotten weeds.
Mrigal- They are popular for commercial farming. They have a longish body, lower body parts are straight lengthwise, and the upper lip is curved downwards. The lower body part and two sides are silver-colored, the backside is grey-colored. They usually live in lower water levels and feed on small insects, organic particles, and decomposed organic elements, etc.
Grass carp- It has a wide-body, the head is almost circular and flat, big cane, small lower jaw, and small eyes. Its color is olive-brown on the dorsal side, with silver sides and belly color is white. These are river fish and have a desire to move from still waters into flowing waters. This fish is herbivorous and feeds upon various water weed species

Hence the correct option is A, Catla.

Note: It is a very important Indian edible fish because they eat food from the surface water or ponds, so it is called a surface feeder. Due to this quality, it is used in composite farming (rice cultivation mixed with fish farming).
Rohu feeds on waste material and rotten weeds. Mrigal feeds mainly on small insects, organic particles, and decomposing elements whereas grass carp feeds on water weed.