You sell it, salt is required for mammals.
Max recommended salt intake is less than 1 teaspoon per day. You need 2 liters of water per day. There's nearly 6 teaspoons of salt in 1 liter of sea water. That's quite a bit of excess salt. Kind of a bummer really. Wish we had a gland that got rid of excess salt then we could just drink sea water.
If such a gland existed, it would probably require a lot of energy to work. Plus, what would the gland do with all of the salt it is filtering just send it to your kidneys/bladder? I'm imagining kidney-stones formed from all the excess salt your body is trying to get rid of
The mammalian equivalent would likely be salt hairs.
It can grow in seawater, brackish water, or effluent from other agriculture or aquaculture. We should be growing more of it.
Atriplex genus are amaranths called "saltbush"; many are edible directly or usable as livestock forage. Atriplex hortensis is a leaf vegetable, like spinach, often paired with sorrel.
Tetragonia tetragonoides is "sea spinach" and has been cultivated as a leaf vegetable.
Attalea speciosa is an oil palm tree.
Anemopsis californica or "yerba mansa" is used as a medicinal herb.
Sea mammals get most of their water from the food they eat (fish, etc.), and don’t drink seawater.
No-one made any such suggestion. One person lamented that such a gland didn't exist; they did not assert its existence. The other person didn't mention glands at all.
That infers sea mammals have working salt glands.
The other commenter clearly implied 2 things:
1. sea mammals have salt glands
2. their bodies have solved the problem of removing waste salt from said glands
There's no way to interpret the commenter's statement otherwise without it being nonsensical. Sea mammals manage (what exactly) just fine?
If you can't see that, then I'm sorry, here's a simpler analogy to illustrate my point:
Me: "Pancakes can't be made without flour"
Commenter: "French chefs manage just fine"
A rational person would deduce that what Person 2 is implying is: "French chefs [are able to make pancakes without flour] just fine", not: "French chefs [are able to make pancakes] just fine"
They do supplement that with water extracted from their food. But unlike humans they are better at expelling salt. “In the seal and sea lion species, for which measurements exist, the animals' urine contains up to two and a half times more salt than seawater does and seven or eight times more salt than their blood.” Human urine on the other hand contains less salt than sea water resulting in dehydration when drinking sea water.
We've got those - they're called kidneys. Unfortunately, they can't get the output dense enough to be useful for drinking saltwater...
(Maximum saltiness of urine is less than that of saltwater, which is why drinking saltwater dehydrates you)
“Animal metabolism produces about 110 grams of water per 100 grams of fat,[1] 42 grams of water per 100 g of protein and 60 grams of water per 100 g of carbohydrate. [...] In mammals, the water produced from metabolism of protein roughly equals the amount needed to excrete the urea which is a byproduct of the metabolism of protein.[6] Birds, however, excrete uric acid and can have a net gain of water from the metabolism of protein.“