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Secondary circulation of the vascular heat exchangers in skipjack tuna,Katsuwonus pelamis

✍ Scribed by Dewar, Heidi ;Brill, Richard W. ;Olson, Kenneth R.

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
504 KB
Volume
269
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Vascular corrosion replicas of the counter current heat exchanger microcirculation in skipjack tuna, Katsuwonus pelamis, were examined by scanning electron microscopy. Smallbore (7–10 μm diameter) vessels, with characteristics typical of those associated with the secondary circulation, were abundant in the central and lateral heat exchangers. These vessels arise from the large‐bore (70 μm diameter) retial arterioles and, after a tortuous path, anastomose repeatedly to form 50–200 μm diameter secondary collecting vessels which ultimately exit from either pole of the rete. © 1994 Wiley‐Liss, Inc.

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## Abstract Tunas (family: __Scombridae__, Tribe: __Thunnini__) exhibit anatomical, physiological, and biochemical adaptations that dramatically increase the ability of their cardiorespiratory systems to transfer oxygen from the water to the tissues. In the present study the vascular anatomy of the