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KasatkaAdministrator
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Plankton
      #130300 - 09/14/05 12:21 AM

Of the animals considered to be plankton, which is the largest in terms of weight, and which is the largest in terms of length?

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~ Kim


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KasatkaAdministrator
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Re: Plankton [Re: Kasatka]
      #130412 - 09/19/05 08:48 PM

Okay, the longest plankton out there is the Lion's Mane jelly, at around 100ft long. (Though there are siphonophores, which can be longer, except they are a collection of animals)

The heaviest animal classified as plankton is the sunfish, which can weigh up to around 3,000 lbs.

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OrcaArtist
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Re: Plankton [Re: Kasatka]
      #130420 - 09/20/05 09:47 AM

They're considered plankton? Wow. Something new everyday.

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KasatkaAdministrator
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Re: Plankton [Re: OrcaArtist]
      #130430 - 09/20/05 04:27 PM

Do you mean the sunfish? Yeah, that surprised me too. =) But if you look at them, I guess it makes sense. They don't have much in means of a tail. I was told they often will just float on their side and go with the current.

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OrcaArtist
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Re: Plankton [Re: Kasatka]
      #130435 - 09/20/05 09:56 PM

Acually both suprised me.

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UlisesGirl
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Re: Plankton [Re: OrcaArtist]
      #130474 - 09/22/05 02:33 PM

Heh... Hard to imagine a humpback filter feeding a 3000 lb animal...

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KasatkaAdministrator
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Re: Plankton [Re: UlisesGirl]
      #130475 - 09/22/05 02:49 PM

I don't think they would. I think their preferences lie along the lines of krill and little shiny fishies. Plankton just means their general direction is governed by current and they suck at swimming.

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Silke
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Re: Plankton [Re: Kasatka]
      #130479 - 09/22/05 03:32 PM

sorry for saying that: but I don't believe that a sunfish (mola mola right?!) is plankton! or did I understood something wrong? a mola mola (in german mondfisch = moonfish) lives also from plankton but is the biggest bone fish. where did you read that it is plankton?

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KasatkaAdministrator
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Re: Plankton [Re: Silke]
      #130480 - 09/22/05 03:42 PM

It was in my marine biology class. =)

They're classified as plankton because they have a difficult time swimming against the ocean current.

"All jellyfish, and the Ocean sunfish are such feeble swimmers that they too are included as plankton."
http://projects.edtech.sandi.net/pbelem/kelp/dive2.html

"Often drifts at the surface while lying on its side, or swims upright and close to the surface that its dorsal fin projects above the water."
http://www.fishbase.org/Summary/SpeciesSummary.php?genusname=Mola&speciesname=mola

"This fish is unusual because it can weigh over a ton, yet is considered to be plankton because it drifts around with currents and rarely swims under its own power."
http://www.divediscover.whoi.edu/expedition5/daily/email-010916.html

Does that help? =)

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Silke
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Re: Plankton [Re: Kasatka]
      #130494 - 09/24/05 10:54 AM

but not everything what is published in the internet is true

compare the second link with the first for example. in the first they describe the sunfish as a "feeble" swimmer (what is not correct!), in the second link, a more scientific side, it is described with "and can propel the fish at surprisingly good speed".

I discussed that also today at the dolphinarium duisburg with some trainers. they are professional zoo keeper and one has much knowledge about marine mammals also with other aquaristic animals. as I said "is a sunfish plankton?" he looked at me as if I said "good news I will marry santa claus!"

he said: its a fish and of course not plankton! and as I said it is described as feeble swimmer, he said that is nonsens because he is a very good swimmer and only because a sunfish "drifts around with currents and rarely swims under its own power" isn't it a definition to be plankton. he said that describtion is absolut nonsens. and it makes really sense in my eyes. I looked at many german scientific sides and I never found something like that. a sunfish is the biggest bony/bone (?) fish and not plankton.


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