Habitat in a Bucket

April 15, 2019

Did you know most animals in the ocean don’t have backbones?

We’re half a week into leg 3 of the NEFSC spring bottom trawl survey and into the full swing of survey life.  Our first tow this morning, around 1:30 am, was a little southeast of Chatham harbor, Massachusetts.  Even though the catch was fairly small, it was full of really interesting benthic invertebrates.  These are the animals that live on the ocean floor and lack vertebrae, the small bones that form a backbone.

This morning we had a small bucket of very diverse specimens.  At first, it may seem difficult to get a grasp of what you’re looking, but it becomes much easier to comprehend after taking some time to separate everything into groups.

pic 1-habitat in bucket sbts 2019

Habitat in a bucket. Photo credit: NOAA Fisheries/Christine Kircun

Here are some highlights from what I found: a diverse range of animals!

pic 2-habitat highlights SBTS2019

A mussel, some sea stars, sponges, a sea mouse, comb jelly, sand dollar, sea urchin, and fish eggs. Photo credit: NOAA Fisheries/Christine Kircun

pic 3-egg close up SBTS 2019

The eggs in one of the clusters were really large, and the larval fish could be seen inside. Note the empty egg in the lower right hand corner of the picture.  Photo credit: NOAA Fisheries/Christine Kircun

Another neat find (pictured below) was a large  orange-footed sea cucumber, Cucumaria frondosa.

pic 4-orange-footed cucumber sbts 2019

Sea cucumber. Photo credit: NOAA Fisheries/Christine Kircun

I quickly placed this animal in a bucket of fresh salt water, and after some time, it relaxed enough to expose its tentacles.  It was surprising to see!  In my experience, they are mostly seen closed up after coming up in the net.

It’s always fun to see tows like these.  Even though it may be harder to pick through on the sorting belt, it’s a great opportunity to see the diversity of life that lives on the ocean floor.

Christine Kircun
Aboard the FSV Henry B. Bigelow
Spring 2019 Bottom Trawl Survey Leg 3

 

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