Blubber biopsy in common bottlenose dolphins using a novel biopsy puncher: Evaluation of the impact on living individuals and possibility of applications in cetacean research

• Published in: Journal of experimental zoology. Part A, Ecological and integrative physiology Vol. 341; no. 5; pp. 499 - 508
• Main Authors: Funasaka, Noriko, Suzuki, Miwa, Hosono, Masayuki, Shindo, Hideaki, Kawamura, Keiko, Inamori, Daiki, Yoshioka, Motoi
• Format: Journal Article
• Language: English
• Published: United States 01.06.2024
• Subjects: Animals; Biopsy - methods; Biopsy - veterinary; blubber biopsy; Bottle-Nosed Dolphin; dolphins; Female; Male; minimally invasive; puncher; Skin - pathology; Wound Healing; wound healing; blubber biopsy; dolphins; minimally invasive; puncher
• DOI: 10.1002/jez.2797
• ISSN: 2471-5638

Biopsy has recently become a preferred protocol for sampling the skin and blubber of many cetacean species, although it is desirable to collect as minimally invasive as possible. Here, the effect of biopsy sampling on the captive common bottlenose dolphins was evaluated by analyzing the process of wound healing and changes in hematological and blood biochemical parameters after biopsy using a puncher developed to collect up to the inner layer of the dolphin blubber. Results showed that the wounds caused by biopsy were closed in as early as 1 day and completely covered with the epidermis within 5–11 days. Blood fibrinogen, which generally increases due to a wound‐induced inflammatory response or activation of the coagulation system, was significantly elevated after the biopsy indicating ongoing tissue repair, while other parameters did not exhibit significant differences. Furthermore, histological observation and RNA extraction of samples were performed to investigate the versatility of this method to cetacean research. Histological examination revealed three distinct layers of the blubber in the biopsy samples. Moreover, total RNA extracted from biopsy samples exhibited sufficient quality and quantity for gene expression analyses. Overall, the puncher utilized in our study represents a valuable and minimally invasive tool for investigating various aspects of small cetacean studies. Research highlights • The developed biopsy puncher is a minimally invasive device that can collect up to inner layer of common bottlenose dolphin blubber, and can be used in a variety of investigations to better understand the metabolic activity and physiology of blubber.