Diario de isopodguy

It's amazing how some animals can be a whole habitat in which many other species can live.
I've especially observed this in pacific cod. These fish can be host to many different parasites.
On just one average cod I've seen fish lice, many gut worms, and parasitic flatworms. I've also seen large sea going leeches on these fish.
For the parasites, it's probably like staying in a moving hotel with free meals.

Lion's mane jellies are some of the most interesting of all jellyfish.
If you know about them, you probably know that they can grow longer than most whales but here are a few other things I thought were interesting.
Lion's mane jellies eat moon jellies. I first learned about this from a nature documentary about cold water life near the top of Russia and got to witness it in real life last year. A large lion's mane had a smaller moon jelly trapped in its tentacles and was slowly eating it.
Lion's mane jellyfish will often let smaller fish live with them. I've often seen a small yellow fish hanging out around much larger lion's manes. I've never identified them but they seem to be some sort of snailfish. I also saw this same kind of fish in a short clip in a video on montereybayaquarium.org though it wasn't named.
Lion's mane jellies can pull in their tentacles. If you seen these jellies do you wonder why some of them have tentacles that stretch out for feet or yards behind them and others have very, very short tentacles. This isn't because some have shorter tentacles. It's actually because the jelly can pull in his tentacles when not feeding.
I hope you found these casual observations to be interesting.