सुदूर संवेदनयंत्रणेचा वापर करून संभाव्य मासेमारी क्षेत्र कोणत्या आधारे ठरविण्यात येते ?
(1) सागरी खारटपणाचा अर्क आणि समुद्राच्या पृष्ठभागाचे तापमान
(2) हरित द्रव्य आणि सागरी पृष्ठभागाचे तापमान
(3) फक्त सागरी पृष्ठभागाचे तापमान
(4) सागरी पाण्याचा रंग व सागरी पृष्ठभागाचे तापमान.

The correct answer is Option B (Chlorophyll and sea surface temperature).

Key Points:
• Core Concept
• Satellite oceanography utilizes multispectral sensors to delineate Potential Fishing Zones (PFZs) to assist commercial fisheries.
• Why Correct
• INCOIS (Indian National Centre for Ocean Information Services) generates daily PFZ advisories by overlaying two parameters:
• 1. Sea Surface Temperature (SST): derived from NOAA-AVHRR and MetOp thermal infrared imagery to locate thermal fronts, upwelling zones, and eddies.
• 2. Ocean Chlorophyll Concentration: derived from Ocean Colour Monitor (OCM) on IRS-P4 / Oceansat to map phytoplankton abundance.
• Where thermal gradients coincide with high chlorophyll concentration, fish congregate in large schools.
• Key Details
• Phytoplankton serves as primary marine food; its presence, tracked via chlorophyll-a pigment, reliably predicts fish aggregation.
• Exam Traps
• While ocean color reflects chlorophyll, 'Chlorophyll and sea surface temperature' is the exact scientific parameter combination used in remote sensing.
• Other Options
• Option 1 is incorrect because salinity is not the primary operational PFZ locator.
• Option 3 fails to incorporate biological productivity (chlorophyll).
• Key Takeaway: Potential Fishing Zones (PFZs) are mapped using satellite-derived Chlorophyll concentration and Sea Surface Temperature (SST).