It is possible the hydrosorter could be used to administer gill-breathable antigens (immunizations) against things like interleukins, sex hormones that are absent effects on secondary sex characteristics yet have cardiovascular risks or carcinogenic
effects, liver enzyme saturating endogenous chemicals, mTOR activators, ILGF-1 (and similar molecules), endogenous telomere length reducing molecules, endogenous AMPK activity decreasing chemicals, possibly some versions of cortisol-like molecules
circulating endogenously, physiochemicals that get upregulated when organisms miss sleep and could be deleterious (missing one night of sleep doubles likelihood of infection at a human); peptides (or proteins)that cause stress, possibly like deleterious
versions of beneficial peptides (or proteins) that occupy beneficial receptors, but have zero or negative activity, keeping the beneficial forms of those peptides (or proteins) from reaching the receptors and providing benefit, various
lipopolysaccharides that might reach the circulatory system from the GI tract, histamine, the physiological chemicals produced at gum disease that I read is like 20something to 48% active at causing cardiovascular disease, Any endogenous physiochemicals
that cause heart rythms outside the wellness standard (although these are of course fish), as well as, noting that a combination of epithalon with thymosin causes four times less mortality during six years at humans, any chemicals that occupy epithalon
and thymosin receptors causing those receptors to not function at preserving living function.

A peltier enabled hydrosorter used at fish could also be used to develop cryogenic cryoprotectants to support human cryonic preservation and revival.

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