Rare symbiotic relationship

Thunder_reef

Active Member
View Badges
Joined
May 27, 2022
Messages
222
Reaction score
481
Location
Ohio
Rating - 0%
0   0   0
Several months ago I acquired a white spot hermit crab, as I’ve stated before I really like hermits so I couldn’t pass him up. The idea being he could live in the fuge portion of my sump until I could set him a tank up. Well that’s finally done but not the point of this post.

after a few days of observing him in my sump I noticed something moving around inside his shell. Then I realized it was a small shrimp. The shrimp lived inside the crabs shell and would pop out to the edge while the crab was eating. I hunted hi and low on the internet trying to Id the shrimp and finally , through desperation I blindly emailed a marine biologist at the University of Hawaii. He emailed me back and identified the shrimp as a Aretopsis amabilis or hermit crab alpheid shrimp. They are both still doing well and it’s fun to watch them. The crab will tumble off rocks and send the little guy twirling he scrambles quickly to get back into the shell. I’m not sure what the shrimp does for the crab but I’m pretty sure the shrimp gets crumbs from the crabs messy eating. The shrimp is very hard to to photograph as he’s very tiny , maybe 2 cm long and constantly moving, but here is the best I’ve been able to do.



FB9F5C4D-C4DC-4F98-A024-89AF3C5C6C7B.jpeg 3ED28958-AC42-4A49-9FDC-B47EA81BC435.jpeg 86A3618E-CA55-4272-94BF-6302E4221896.jpeg
 

Daniel@R2R

Living the Reef Life
View Badges
Joined
Nov 18, 2012
Messages
37,527
Reaction score
64,046
Location
Fontana, California
Rating - 100%
1   0   0
Super cool! First time seeing this one!
 

DE FISH

Valuable Member
View Badges
Joined
Jan 19, 2021
Messages
1,070
Reaction score
2,325
Location
UK
Rating - 0%
0   0   0
That’s beautiful nothing better than a healthy beneficial relationship!

let’s just hope they don’t file for divorce in a few months….
 

Daniel@R2R

Living the Reef Life
View Badges
Joined
Nov 18, 2012
Messages
37,527
Reaction score
64,046
Location
Fontana, California
Rating - 100%
1   0   0

sixline

Active Member
View Badges
Joined
May 10, 2020
Messages
391
Reaction score
450
Rating - 0%
0   0   0
I’m not sure what the shrimp does for the crab but I’m pretty sure the shrimp gets crumbs from the crabs messy eating.
According to wikipedia, there are three distinct types of symbiotic relationships. Perhaps the crab does not benefit at all.

mutualistic: both species benefit
commensalistic: one species benefits, while the other sees no impact
parasitic: one species benefits, the other is negatively impacted


I do see it, hard to see it.
That's why they call them shrimp! :)
 

katonge

Active Member
View Badges
Joined
Jul 18, 2019
Messages
302
Reaction score
228
Location
NPR, Florida
Rating - 0%
0   0   0
Several months ago I acquired a white spot hermit crab, as I’ve stated before I really like hermits so I couldn’t pass him up. The idea being he could live in the fuge portion of my sump until I could set him a tank up. Well that’s finally done but not the point of this post.

after a few days of observing him in my sump I noticed something moving around inside his shell. Then I realized it was a small shrimp. The shrimp lived inside the crabs shell and would pop out to the edge while the crab was eating. I hunted hi and low on the internet trying to Id the shrimp and finally , through desperation I blindly emailed a marine biologist at the University of Hawaii. He emailed me back and identified the shrimp as a Aretopsis amabilis or hermit crab alpheid shrimp. They are both still doing well and it’s fun to watch them. The crab will tumble off rocks and send the little guy twirling he scrambles quickly to get back into the shell. I’m not sure what the shrimp does for the crab but I’m pretty sure the shrimp gets crumbs from the crabs messy eating. The shrimp is very hard to to photograph as he’s very tiny , maybe 2 cm long and constantly moving, but here is the best I’ve been able to do.



FB9F5C4D-C4DC-4F98-A024-89AF3C5C6C7B.jpeg 3ED28958-AC42-4A49-9FDC-B47EA81BC435.jpeg 86A3618E-CA55-4272-94BF-6302E4221896.jpeg
That is so cool!
 

AcanSkywalker

Active Member
View Badges
Joined
Feb 4, 2016
Messages
193
Reaction score
150
Location
Downers Grove, Illinois
Rating - 0%
0   0   0
Several months ago I acquired a white spot hermit crab, as I’ve stated before I really like hermits so I couldn’t pass him up. The idea being he could live in the fuge portion of my sump until I could set him a tank up. Well that’s finally done but not the point of this post.

after a few days of observing him in my sump I noticed something moving around inside his shell. Then I realized it was a small shrimp. The shrimp lived inside the crabs shell and would pop out to the edge while the crab was eating. I hunted hi and low on the internet trying to Id the shrimp and finally , through desperation I blindly emailed a marine biologist at the University of Hawaii. He emailed me back and identified the shrimp as a Aretopsis amabilis or hermit crab alpheid shrimp. They are both still doing well and it’s fun to watch them. The crab will tumble off rocks and send the little guy twirling he scrambles quickly to get back into the shell. I’m not sure what the shrimp does for the crab but I’m pretty sure the shrimp gets crumbs from the crabs messy eating. The shrimp is very hard to to photograph as he’s very tiny , maybe 2 cm long and constantly moving, but here is the best I’ve been able to do.



FB9F5C4D-C4DC-4F98-A024-89AF3C5C6C7B.jpeg 3ED28958-AC42-4A49-9FDC-B47EA81BC435.jpeg 86A3618E-CA55-4272-94BF-6302E4221896.jpeg
I'm so glad I ran across your post, it's awesome! I especially appreciate our hobby for the symbiotic relationships, God only knows how many more are out there, with so many of His wonderful creations yet to be discovered in our vast oceans they might be countless! Thanks for sharing this one!
 
OP
OP
Thunder_reef

Thunder_reef

Active Member
View Badges
Joined
May 27, 2022
Messages
222
Reaction score
481
Location
Ohio
Rating - 0%
0   0   0
UPDATE

The crab went dormant for several days and then molted and changed shells. Sadly I think the small shrimp didn’t make it through that ordeal. I haven’t seen him inside the new shell at all and that was 3 days ago.
 

((FORDTECH))

2500 Club Member
View Badges
Joined
Jan 23, 2020
Messages
4,838
Reaction score
4,274
Location
Chicago
Rating - 0%
0   0   0
UPDATE

The crab went dormant for several days and then molted and changed shells. Sadly I think the small shrimp didn’t make it through that ordeal. I haven’t seen him inside the new shell at all and that was 3 days ago.
I’m sure he’s in your rock work somewhere and will pop up in future
 

Looking for the spotlight: Do your fish notice the lighting in your reef tank?

  • My fish seem to regularly respond to the lighting in my reef tank.

    Votes: 94 75.8%
  • My fish seem to occasionally respond to the lighting in my tank.

    Votes: 15 12.1%
  • My fish seem to rarely respond to the lighting in my tank.

    Votes: 8 6.5%
  • My fish seem to never respond to the lighting in my tank.

    Votes: 1 0.8%
  • I don’t pay enough attention to my fish to notice if they respond to the lighting.

    Votes: 2 1.6%
  • I don’t have any fish in my tank.

    Votes: 2 1.6%
  • Other.

    Votes: 2 1.6%
Back
Top