First time screenshots with HDS10 Gen 2

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What do you think that long thing is by the cursor on these two? I know the picture is small but I don't know how to make it bigger.
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Looks like it may have been a fish that just happened to be going the same direction the boat was and several consecutive pings echoed from it...

Rickie

Those lines usually represent fish that are swimming.

i think fish

Fish swimming makes sence to me. Iv also seen this before but wasnt sure what it was. Glad to see someone has an answer.

Thanks guys