Saltvandsforum.dk

seadooman skrev:Smid lige en link til et billede op Noooze

noooze skrev:yes jeg ved nemlig hvad den spiser - bryopsis
og senere hen kan man smide dem i sumpen hvorefter de vil spise capulera alger - har læst en del om dem på udenlandske sites, og der er flere der har oplevet at 3 styk af disse i en sump, formere sig så meget at man bare kan gi dem væk til højre og ventre

noooze skrev:yes jeg ved nemlig hvad den spiser - bryopsis
og senere hen kan man smide dem i sumpen hvorefter de vil spise capulera alger - har læst en del om dem på udenlandske sites, og der er flere der har oplevet at 3 styk af disse i en sump, formere sig så meget at man bare kan gi dem væk til højre og ventre

noooze skrev:hvorefter de vil spise capulera alger

Carsten skrev:

noooze skrev:yes jeg ved nemlig hvad den spiser - bryopsis
og senere hen kan man smide dem i sumpen hvorefter de vil spise capulera alger - har læst en del om dem på udenlandske sites, og der er flere der har oplevet at 3 styk af disse i en sump, formere sig så meget at man bare kan gi dem væk til højre og ventre

Det komer du lige til at sende et link til. Lyder meget underligt at der kna være så stor forskel på hvad et videnskabligt forum skriver og så hvad et populært site kommer frem med.

This thread has not been updated in a while, but it seems that there may still be confusion on eating habits of Elysia crispata.

My family now has third generation Elysia crispata in various home aquaria. I know they are at least third generation because the eggs of the original animal were transferred to a new tank. Eggs laid by Elysia crispata in the second tank where transferred to a third aquarium to hatch and grow.

I have observed the adults eat Bryopsis in large quantities. This seems to be the preferred food. But they also eat Chaetomorpha as well as Caulerpa racemosa, Caulerpa taxifolia, Caulerpa serrulata, and several other varieties of Caulerpa (I don't know the scientific names off-hand). Caulerpa is only eaten as a last resort if the preferred food is not found. Juvenile slugs however only ate Bryopsis or Chaetomorpha. They could be raised to maturity on either exclusively.

I am also surprised that the experiments did not carry through to multiple generations because my Elysia crispata were adult size two months after hatching if given access to either Bryopsis or Chaetomorpha and good lighting. The fastest growing slugs were kept in a vertical refugium full of Chaetomorpha with a 28 W compact fluorescent hanging on the side. They would voluntarily remain directly beside the light so that they were only a few cm from the bulb for weeks at a time while growing. Once they reached about 4 cm in length they began to move about much more actively.

Drew
Fort Wayne, Indiana

Dear Drew,
Thanks for the information. I am sure it will be of interest to those studying this fascinating animal. One thing that would be useful is if you could confirm the identity of your Elysia. Many of the animals previously identified as E. crispata have been shown to be a separate species which has been named Elysia clarki. Have a look at that Fact Sheet for links to a comparison between the species. Perhaps you have a photo you could send?

Best wishes,
Bill Rudman

The literature is confusing with respect to the algae that E. crispata consumes. For many months we were doing a variety of molecular and biochemical experiments with the wrong one based on information that E. crispata was a Caulerpa eater,” said Pierce in a forum on sea slugs. “In fact, it does not eat Caulerpa at all.
To make a long story short, [we] have spent the last year showing, with both molecular markers and electron microscopy, that the sequestered chloroplasts in E. crispata actually originated in three species of algae.” To discover their proper food source, Massey and Curtis starved the slugs by keeping ones with photosynthesizing abilities in a freezer at 8 degrees celsius. Feeding them only on automated lights that shine on the slugs for 12 hours each day, the slugs eventually turned brownish-yellow after their symbiotic plastids failed. When they tried to feed these starved slugs Caulerpa, they died, but when they put them on Penicillus capitatus they rapidly recovered both their green color and their intracellular chloroplasts.

Lars S skrev:Hvad er bryopsis ?

noooze skrev:min Kh er faktisk inden for det normale - har dog bøvlet en smule med for lav KH for et stykke tid siden.
men nu er den som den skal være, men den dumme bryopsis vokser endnu mere vildt nu end før

har dog haft meget held til at fjerne den manuelt, så det ikke tager overhånd.

fra udenlandske sites ser det da ikke ud til at seaslugs er så sindsygt dyre... men det er de måske i dk ?

sådan en bryopsis / capulera spisende fætter ville ikke være dum at ha

Lars S skrev:Hvor stor / høj er den alge ?

For jeg har en del ''pæne'' totter hist og her, de ser meget pæne grønne ud, og de står i små klynger og det ser godt ud syndtes jeg.
De er ikke så grønne om formiddagen som om aften, her er lant pænest.