How many stabilizing finlets typically run from the second dorsal and anal fins to the caudal peduncle in Yellowfin Tuna?
Answer
Four to nine
Yellowfin tuna utilize a series of small stabilizing structures known as finlets located posteriorly on the body. These finlets extend along the caudal peduncle, which is the narrow section where the tail fin attaches, beginning after the second dorsal fin and the anal fin. Sources consistently report that the number of these finlets present on the species ranges between four and nine, serving a function in maintaining stability during rapid movement.
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