: Does eating fish help high blood pressure? The common advice for people who have been diagnosed with heart problems like hypertension is "eat more fish, especially salmon." I've done a great deal of Googling and what I can't

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According to the American Heart Association should have fish high in omega 3 fatty acid twice a week.

The American Heart Association recommends eating fish (particularly
fatty fish) at least two times (two servings) a week. Each serving is
3.5 ounce cooked, or about ¾ cup of flaked fish. Fatty fish like salmon, mackerel, herring, lake trout, sardines and albacore tuna are
high in omega-3 fatty acids.

Increasing omega-3 fatty acid consumption through foods is preferable.
However, those with coronary artery disease, may not get enough
omega-3 by diet alone. These people may want to talk to their doctor
about supplements. And for those with high triglycerides, even larger
doses could help.

Omega-3 fatty acids also decrease triglyceride levels, slow growth
rate of atherosclerotic plaque, and lower blood pressure (slightly).

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Question: Does eating (fatty) fish help to lower high blood pressure or does it help only when eaten instead of red meat?

Answer: Merely increasing fish, including oily fish, consumption without other dietary changes (especially losing excessive weight) may not help to reduce blood pressure.

FISH

Food Groups and Risk of Hypertension: A Systematic Review and Dose-Response Meta-Analysis of Prospective Studies (Academic.oup, 2017):

In our study, fish consumption was associated with a slight increase
in hypertension risk.

FATTY FISH

Food groups and intermediate disease markers: a systematic review and network meta-analysis of randomized trials (Academic.oup.com, 2018):

Consumption of fatty fish resulted in significant improvements in
triglycerides and HDL cholesterol, whereas no effects were observed
for...systolic and diastolic blood pressure.

RED MEAT

According to one systematic review (American Society of Nutrition, 2017), consumption of red meat is associated with high blood pressure, but in some other studies (ResearchGate, 2014; Nutrition Journal, 2017) no such association have been found.

THE DIET AS A WHOLE

A Series of Systematic Reviews on the Relationship Between Dietary Patterns and
Health Outcomes (USDA.gov, 2014):

There is strong and consistent evidence that consumption of a DASH
[Dietary Approaches to Stop Hypertension] diet results in reduced
blood pressure in adults with above optimal blood pressure... A
dietary pattern consistent with the DASH diet is rich in fruits,
vegetables, low-fat dairy, fish, whole grains, fiber, potassium, and
other minerals at recommended levels, and low in red and processed
meat, sugar-sweetened foods and drinks, saturated fat, cholesterol,
and sodium.