Tagging Whales in the Antarctic Seas

Big Whale – Tiny Sample
by -- January 18th, 2015

 

We can learn a huge amount about the whales we study from minute samples of skin and superficial blubber. We use a specially designed remote biopsy dart system to obtain a tiny sample from each whale we identify in the field.

 

Two Flukes

Two humpback whales dive near Palmer Station, showing their flukes. Photograph by Zach Swaim.


We collect the samples using a small surgical biopsy tip that we deliver using a crossbow. The tip has a foam collar that ensures that we take only superficial tissue and also helps the darts to float after they bounce off the whale. Each sample measures about 25 mm in length and 5 mm in diameter and weighs only a few grams. In contrast, the whales are about 15 meters long and weigh 40 to 50 tons. The best analogy we can think of is that it’s like a mosquito bite to you or me.

 

20150113_Mno_P1_AJR_7485

Obtaining a biopsy sample from humpback whale Mn-15-13-A-P near Palmer Station. The biopsy dart is visible under the anterior portion of the dorsal fin. Photograph by Andy Read.

 

We work hard to ensure that we identify each whale before attempting a sample and compare pictures of its flukes with our catalog, which is stored on an iPad that we bring onboard. If the whale is new to us (as most have been this year), we move our Zodiac alongside the whale and fire the biopsy dart at its flank when it arches to dive, usually from a distance of 10 or 15 meters. Needless to say we are extremely careful throughout the entire sampling process. Zach is a very good shot and rarely misses. And yes, I know, he is shooting at an enormous whale, which helps.

 

Biopsy Sample

Biopsy sample (middle) of skin and superficial blubber from a humpback whale sampled on January 2nd. Photograph by Andy Read.

 

The tiny samples provide an enormous amount of information about each whale we sample, including its sex, recent dietary history, reproductive status, and health. We also use genetic markers to infer which breeding population the whale comes from. Logan Pallin, who graduated from Duke last spring, and will be attending graduate school at Oregon State University next year, will be conducting progesterone assays from our blubber samples to determine if female whales are pregnant. We are looking forward to having Logan tell us which whales we can expect to see with new calves next year!

1 Comment

  1. Micky Swaim
    Jan 20, 2015

    Love all the updates!!! Sure beats making underwear!! ZT Swaims Dad. :).

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