What must anglers understand about yellowfin behavior regarding the thermocline layer?
Answer
Large yellowfin retreat to the 300 to 600 feet thermocline layer during midday heat or low light
Understanding the target species' response to daily light and thermal conditions is paramount for successful angling. Yellowfin tuna, especially the larger specimens, do not remain exclusively at the surface. When light intensity increases midday or during periods of low light, they seek a more stable thermal environment, which is provided by the thermocline layer situated deeper in the water column, commonly cited between 300 and 600 feet. Anglers targeting these deeper fish must use appropriate gear, like deep-dropping jigs, to successfully intercept them there rather than focusing solely on surface activity.
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