With regards to the moisture and protein content, when looking at foods for pets (fish, cats, dogs, etc.), it's a good idea to look at the dry matter basis of the guaranteed analysis. To state it simply, frozen foods and wet foods show super low protein and fat contents on their guaranteed analysis labels when compared to dry foods - this isn't because they're lower quality or less healthy, it's just that they have more moisture in the mix. To compare apples to apples protein and fat of frozen/wet vs dry foods, you take the dry matter basis of each factor (protein on its own and fat on its own once you've accounted for moisture).
For example, San Francisco Bay Brand Frozen Spirulina Brine Shrimp lists the following guaranteed analysis:
Crude Protein (Min): 3.7%
Crude Fat (Min): 1.2%
Crude Fiber (Max): 1.6%
Moisture (Max): 94.8%
Ash (Max): 0.2%
Phosphorus (Min): 0.1%
Looks very not nutritious. But, when you account for the moisture by taking the dry matter basis, you realize that that 3.7% protein is 3.7 out of 5.2 (the actual amount of food in the pack; i.e. the percent of the food that isn't moisture like the water used to hold the frozen food together or to keep the meat in the cat food can fresh). So, looking at the dry matter basis, 3.7/5.2 = 0.71 (rounded for simplicity's sake) - times this by 100 to get the percentage and you get a dry matter basis of 71% Crude Protein content. So, while it looks unhealthy at first glance, when you look at just the food in the food packet and not the moisture plus the food, you find out that the food is actually fairly healthy.
Because of this, a lot of frozen/wet pet foods look worthless at first glance, but some of them are actually top of the line foods when compared to dry foods this way. The only real downside of frozen/wet foods is that - because of the high moisture content - you might not always be getting as much food pound for pound as buying dry (i.e. one lb of dry food is going to have a lot more actual food in the container than one lb of frozen/wet food because of the lower moisture content). This really just means that frozen/wet foods are generally more expensive.
TLDR: Frozen/wet pet foods look unhealthy, but, accounting for moisture, they're usually high quality. They're just expensive too.
in the ingredients it clearly has way more beneficial things for the fish then frozen food
