Macroalgae that has washed up onto the beach / shore via tide

[WhoIsCandice]

In California I will usually see macroalgaes that wash up to the shore, examples are marked below.

These macroalgaes are super common and when washed up to the shore, if high tide does not sweep them back into the ocean in time before drying out, usually will result in a stinky beach and just rotting while amphipods consume these rotting macroalgaes on the shore.

Anyways, I was wondering if
A: This is officially allowed (though I haven't seen anyone or anything care as long as you're collecting specimens that clearly will rot)
B: If anyone has had experience with which species do the best with the temperature shift, as California is 60-75 degree water-temp typically (depends on the part of the state you're at), but reefs can go a bit higher.

Examples below,

Pterosiphonia dendroidea Ulva latissima AKA sea lettuce

 

[jabberwock]

Check local fishing regs first.

 

[WhoIsCandice]

Recreational Harvest of Kelp and Other Marine Algae

Seems like it might be ok : )

 

[Nano_Man]

Sea lettuce does well in the tanks . There are other sea weeds but they do stain the water colour . In the sea this will be diluted constantly but in a inclosed glass box you see the colour leaching just my experience but I would say not all like the sea lettuce leach anything. This is the only picture of some sea lettuce.

 

[AydenLincoln]

Sea lettuce does well in the tanks . There are other sea weeds but they do stain the water colour . In the sea this will be diluted constantly but in a inclosed glass box you see the colour leaching just my experience but I would say not all like the sea lettuce leach anything. This is the only picture of some sea lettuce.

Is this your tank? Are those anemones? Did you collect everything in it? Is it a sump? Why is there that type of rock?

 

[Court_Appointed_Hypeman]

Is this your tank? Are those anemones? Did you collect everything in it? Is it a sump? Why is there that type of rock?

2nd this, that's a way different environment than I usually see.

 

[bluemon]

2nd this, that's a way different environment than I usually see.

It seems like a coldwater local anemone tank. Either US west coast or I've also seen a Scandinavian aquarist do something similar

 

[atoll]

Cold water native marine aquarium. We have many such here in the UK given our climate.

 

[TangerineSpeedo]

I thought you needed a fishing license with an ocean stamp to collect technically, but the code is full of contradiction.
Ulva, will transfer to a warmer tank, but can take over the tank. Some of the reds will do fine. Kelp will disintegrate. Of course Sargassum is an invasive weed and is very hardy.
Kelp and other algae are full of zooplankton and you could be introducing new animals to your tank, wanted or unwanted. So proceed with caution.
@WheatToast would be a good source for this.
I have a temperate tank and I would like to say that probably 90% of what is in my tank has come off of kelp as zooplankton.

 

[Nano_Man]

Is this your tank? Are those anemones? Did you collect everything in it? Is it a sump? Why is there that type of rock?

Cold water uk native tank . Everything from our seas in the uk for more info
Thread 'Uk cold water rock pool'
https://www.reef2reef.com/threads/uk-cold-water-rock-pool.987271/

 

[Court_Appointed_Hypeman]

It seems like a coldwater local anemone tank. Either US west coast or I've also seen a Scandinavian aquarist do something similar

I was thinking the "crabitat" as well