Question

Sciaenids are mainly caught by

• A. Dol net
• B. Shore seine
• C. Trawl net
• D. Drift gill net

Hint:

Rule of Thumb: For any "bottom-dwelling" or "demersal" fish group (like Croakers, Flatfishes, or Prawns), the most likely answer for the "main gear" is Trawl Net.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks for the primary fishing gear used to harvest Sciaenids, a family of marine fishes commonly known as croakers or drums.
Detailed Explanation:

• Biology of Sciaenids: Sciaenids are demersal (bottom-dwelling) fishes. They are found in coastal waters and estuaries over sandy or muddy bottoms. Because of their bottom-dwelling habitat, they are most efficiently caught by gear that sweeps the seabed.

• Primary Gear - Trawl net (C): Bottom trawling is the most effective commercial method for catching demersal species. Modern mechanized trawlers in India land the bulk of the Sciaenid catch, particularly smaller varieties like "Dhoma."

• Other Gears:
• Dol net (A): While dol nets catch some Sciaenids in Maharashtra and Gujarat, they are primarily aimed at pelagic/semi-pelagic species like Bombay duck.

• Shore seine (B): These are used in shallow nearshore areas and catch some Sciaenids, but the quantity is small compared to offshore trawling.

• Drift gill net (D): These are mostly surface or mid-water nets used for pelagic species like tuna, mackerel, and larger croakers (like the Ghol), but for the Sciaenid group as a whole, trawling is the dominant method.

• Economic Importance: Sciaenids form one of the largest components of the marine fish landings in India, especially on the West coast. Large sciaenids like Protonibea diacanthus (Ghol) are highly prized for their swim bladders (isinglass).

Step 2: Final Answer:
Trawl nets are the main gear for Sciaenid fisheries due to the demersal nature of these fishes.