Copepod ID ?

[GBPUK]

Any ideas what these are ? I know they are Calanoid but any one know species ?

[spawner]

Do you know the size of them?

[GBPUK]

I was unable to find my scale slide, what I can tell you is they are smaller than Tangerine pods and Tigriopus. I was able to observe that because I have cultures of both of them.

[Luis A M]

They look like Acartia,but could be any calanoid.You should know what species you brought in.If you see females with egg sacs,then they are not Acartia,nor Parvo.

[GBPUK]

I bought them as "MARINE COPEPODS" from a LFS so I have no positive ID on them, I am hoping they are Acartia as we can not get them here cheap and these were cheap. I ordered a full case of them 48 x 90ml pouches in case they are. If not the adult Mandarins will have a feast.
I only have Tangerine and Tigriopus to compare them to.
Of all the samples I have put under the scope none are showing egg sacs so I am leaning toward Acartia, but dont want to get to excited.

[Luis A M]

So nobody at the LFS recalls or keeps records of what they had purchased?
If you succeed in storing and hatching eggs as described,you can be pretty sure they are A.tonsa

[GBPUK]

The LFS is a chain, the food came in prepackaged. They tried to find out but had no luck. I am hoping when the case arrives it will have details of the company so I can contact them. I did view a naup under the scope today and it was tiny, only as wide as the thickest part of the adult antennae.
I don't feel confident enough to collect and store eggs. Thank you for your input.

[spawner]

My thought was A.tonsa as well.

[Luis A M]

Small naups of A.tonsa make quick circular jumps.Naups of Parvo often show a lateral view to the observer

And storing eggs is easy if you follow my protocol.And convenient.

[GBPUK]

I sure hope they are A.Tonsa I have some Mandarins I want to have a go with. The naup did have a strange swimming action almost like Moina.
If they are Tonsa and I manage to keep them alive I will attempt to collect eggs to store once I have read the article.

This one is from a culture I have that I purchased as Tangerine. It is much larger than the other Calanoid.

[spawner]

Opps. Misread your last post.

[Luis A M]

Tangerines are Arctodiaptomus salinus.The egg sac is single,not paired as in other species.

[zimajays]

These are from the same "marine copepod" Gary sent them to me. Taken on a 1cm slide with 100micron marks. Also a pic of a female taken with my camera pointing down the eye piece.

https://fbcdn-sphotos-e-a.akamaihd.net/ ... 8309_n.jpg

[arrecife fuego]

hi what kind of copepod is this ? , I found in my rotifer culture.

http://i308.photobucket.com/albums/kk33 ... _07221.jpg



http://i308.photobucket.com/albums/kk33 ... _07281.jpg

[Luis A M]

Positively a harp.