I see no downside.

Variety is the spice of life.

Farmed fish a fed pelletized feed and are susceptible to mass parasitic
infections. I eat fresh caught, never farmed.

Only in specific areas. Close to shore near polluted rivers or shore
lines. Fish caught offshore have little chance of much pollution unles
the entire ocean is cosidered polluted.

Fish is one of the healthiest foods available to humans. Of course,
that assumes minimal or no processing and no added preservatives,
fillers, binders, colorants, etc. Only real fresh or frozen fish from
the fishmonger.

TC

"What are nutritional up-sides and down-sides of eating fish?"

Long-chain omega-3 lipids, vitamin B12, potassium, selenium,
iodine, natural protein.... A 95% vegan plus 5% fish diet easily
provides all the nutrients we need.

"Is there a preferable cooking method?"

Low heat. I poach mine.

"Farmed fish or Caught Fish?"

With farmed fish, you have no idea what you are getting. Fish are
what they eat too. The Alaskan fishery is one of the most
sustainably-managed ones in the world, and pollution in the
fishing areas is about as low as there is. Frozen fish is
obtainable with no additives, isn't overcooked at high
temperature the way canned is, and is usually in much healthier
condition by the time it arrives at market than 'fresh'.
Personally I use High Liner brand - it's the best available
locally; their pink salmon is Alaskan.

As gentle as possible, meaning low temperature. Oven cooking in lowish
temperature may be the best. Avoid overcooking. Then there's of course
raw fish, for example sushi and gravad lax (salted raw salmon).

Abosulutely caught fish. Quality of fish depends on what it eats and I
don't think that the stuff fed to farmed fish can produce as high
quality fish as caught fish. And farmed fish moves less than wild fish
may therefore have higher amount of saturated fats. Farmed fish has
also much higher arachidonic acid content than wild fish. Arachidonic
acid is a precursor of inflammation mediators and too much of it
promotes inflammation.

It may, at least in certain areas, but in general benefits of eating
fish are much greater than the potential harmful effects caused by
pollution.

Fish is continuously discussed in this group and new benefits are
still emerging. I suggest that you search for the old articles in this
group and do also some web searches.

There is much good advice on

http://www.oceansalive.org/home.cfm

Take a look at it. Personally I eat wild-caught (NEVER
farmed) sardines, salmon, oysters, or whole baby
clams--about twice a week. The problem with farm-
raised fish is that farmers feed the carnivores CORN.
Another problem is pollution from the fish farms and
the crowding of the fish. These enviroments are very
unhealthy for the fish, the planet, and for us. It's the
flip side of the VERY bad idea of feeding cattle--which
are herbivores--corn, a food which the cattle did not
evolve to eat. The meat industry does this because
corn is a VERY cheap way to fatten the cattle quickly.
Grass-fed beef is very expensive and hard to find.
Most cattle are raised for the first six months of their
lives on pastures and then shipped to feedlots where
they are fattened on corn, beef tallow, and hormones.
The diets and enviroments are so unhealthy for them
they must given antibiotics for the rest of their lives--
about eight months.

George W. Cherry