Netting Webbing Drag: The netting body (twines, knots, meshes, and codend) accounts for $55\% - 65\%$ of the total gear resistance due to skin friction and form drag across the thousands of open meshes.
Gillnets are passive fishing gear that capture fish by snagging (behind teeth/maxilla), gilling (behind the operculum), or wedging (around the body girth).
Baranov's Geometric Principle of Selectivity: The optimal mesh perimeter ($2m$) corresponds directly to the maximum girth ($G$) or opercular girth of the target fish:
$$m = k \times L$$
Therefore, the body size, cross-sectional girth, and shape (morphometry) of the target fish species are the primary determinants of the specific mesh size required.
Correct Option: Option 1 (Body size and shape of target fish).
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3
ICAR JRF Fish Processing Technology 29 Jun 2024Shift 1
Lampara Net: A traditional Italian surrounding net featuring a deep, central dustpan-shaped bag (bunt) and two long, tapered wings.
Unlike a purse seine, a Lampara net is a surrounding net without a purse line.
During retrieval, hauling the groundline faster than the floatline closes the bottom of the net as the wings converge, trapping fish within the central scoop-like bunt.
Correct Option: Option 2 (Surrounding net without a purse line).
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4
ICAR JRF Fish Processing Technology 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
The bilge keel fitted just below the water level in the mid-ship area of the boat
Bilge Keels: Longitudinal hydrodynamic fins or structural plates welded along the turn of the bilge (chine) on either side of the vessel's hull near the midship section.
When the vessel rolls transversely in sea waves, the bilge keels displace water, generating strong hydrodynamic eddies and viscous drag forces perpendicular to the rolling direction.
This substantially damps and reduces the rolling motion of the vessel, improving navigational stability, sea-keeping ability, and crew safety without obstructing forward movement.
Correct Option: Option 3 (reduces rolling of the boat).
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5
ICAR JRF Fish Processing Technology 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which fuel is used for the propulsion of deep sea fishing vessels
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