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Ingredient file // Animal protein

Ocean Fish

Useful fish protein with the species hidden

Ocean fish is marine fish tissue sold under a broad name that does not disclose the species. It supplies animal protein and may contribute marine fats, but the name alone cannot tell you how much EPA, DHA or iodine the finished food contains.

What it is
Marine fish tissue from an undisclosed species or blend, sometimes recovered from backbones left after filleting.
Made from
Ocean fish, sometimes filleting racks
Main job
Animal protein
Typical amount
Not published
Watch for
Species and finished food testing undisclosed
Not the same as
Fish meal

Our read // In our catalog

In 1 of every 282 foods we track

Share of foods that list it

0%

11 of the 3,105 foods with an ingredient list on file, from 7 brands. All wet dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 4. In the top five of 8 foods, so it is usually a main ingredient.

Top five List position, heaviest first

Above the salt

100%

Almost always listed before the salt, so there is more of it than a pinch.

Price per lb

Foods with it $1.62
All foods $3.25

Median of the cheapest bag price across 1 priced foods, 50% below the catalog. The price is the food's, not the ingredient's.

Who leans on it

36%

of the foods that list it are from Artemis. 7 brands use it in total.

What it is

How it is made

Seafood processors remove fillets and leave backbones with attached flesh. Industry representatives told AAFCO that broad ocean fish blends often use these racks. Whole fish and separated fish tissue are other possible inputs.4,7,9

  1. 01 // Source Fish or racks Whole marine fish or backbones carrying flesh come from catches and seafood filleting lines.
  2. 02 // Process Flesh recovered Some racks pass through a mechanical separator that squeezes attached flesh away from much of the bone.
  3. 03 // Process Kept cold Fish usually reaches pet food plants in refrigerated trucks; industry representatives also described frozen blocks.
  4. 04 // Output Fish tissue Chilled or frozen fish tissue enters the recipe before sealed wet food receives heat sterilization.

What is in it

Composition, dry matter

35-60

% protein

About the protein range measured in raw herring, salmon and cod backbones. These are reference samples, not a specification for ocean fish.

Crude protein 34.6-60.3%4
Crude fat 6.2-52%4
Ash 10.2-29.7%4
Omega-3 fatty acids 7.7-47.3 g/kg4

The study measured raw backbones from 3 named species, not commercial ocean fish lots. Species, fat content and how much bone is removed change the protein, mineral and omega-3 content.4

Why it is in the bag

What the manufacturer gets

  1. 01

    Supplies animal protein

    Fish tissue adds protein to the recipe. In a senior dog trial, specified fish meals and hydrolysate replaced poultry meal without reducing measured nutrient digestibility.1,4

  2. 02

    Uses filleting leftovers

    Backbones still carry flesh after fillets are removed. Recovering it gives seafood processors a saleable outlet for material that would otherwise need another use or disposal.4,5,7

  3. 03

    Adds variable marine fat

    Fish tissue carries fat, including omega-3 fatty acids. The tested species differed sharply, so a formulator needs supplier measurements to know what the fish contributes.4

How much No published rate covers this label term; a senior dog trial tested 20% specified fish meals or hydrolysate in dry food.1

Our read // The claims

What the evidence supports

Strong: controlled studies in dogs agree. Some: small or mixed dog data. Thin: mechanism or lab work only. None: nothing, or the evidence points the other way.

  1. Brands say

    Fish supplies usable animal protein

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A senior dog trial replaced poultry meal with 20% specified fish meals or hydrolysate and found similar nutrient digestibility. That supports fish as a protein source, but the trial did not test unspecified wet ocean fish.1

  2. Brands say

    Ocean fish boosts omega-3 in dogs

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    An experimental diet used 5% fish hydrolysate plus 3.2% separately added fish oil. Its blood omega-3 index averaged 3.77 versus 2.58 for the control diet. The trial cannot isolate an effect of ocean fish tissue.2

  3. Brands say

    Ocean fish supplies iodine for thyroid health

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Measured herring cuts contained 12.6 to 91.8 micrograms of iodine per 100 g wet weight. Ocean fish names neither the species nor its iodine content, and this measurement tested no thyroid benefit in dogs.5

  4. Brands say

    Ocean fish makes a dog's coat shinier

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A 12-dog crossover compared fish hydrolysate plus fish oil with shrimp hydrolysate plus salmon oil. Coat scores did not differ. That study gives no coat benefit to promise from an unspecified ocean fish ingredient.2

  5. Brands say

    Ocean fish is hypoallergenic

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Fish caused reactions in 5 of 297 dogs with identified food reactions in a research review. A broad fish blend cannot serve as a known novel protein for a dog whose elimination diet needs a specific source.3,7

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Fish tissue supplies protein and fat. Its bone share changes how much mineral comes with it. The broad name limits what you can learn about the source, but the ingredient has a nutritional job.1,4

  2. Q02

    Which fish is it?

    Not disclosed

    Industry representatives told AAFCO that ocean fish blends often contain racks. That account does not identify the species or parts in the food you are holding. Ask its maker for the actual fish sources.7

  3. Q03

    Does it provide enough omega-3?

    Unknown

    Tested fish backbones differed widely in omega-3 content. The ingredient list gives no EPA or DHA amount, and separately added fish oil could supply much of the finished food's marine fat. Ask for finished food values.2,4,8

  4. Q04

    Is mercury a problem?

    Unknown here

    FDA animal food guidance says the highest mercury readings in one pet food survey came from foods listing fish first. It did not test this ocean fish supply. Ask the maker for finished food testing if it is a daily staple.6

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Artemis 4
  2. Canidae 2
  3. Jinx 1
  4. Dave's Pet Food 1
  5. Taste of the Wild 1
  6. Health Extension 1
  7. Verus 1

Usually listed with, share of the foods that list it

  1. Fish Broth 64%
  2. Carrots 64%
  3. Peas 64%
  4. Dried Egg Product 64%
  5. Chicken 45%
  6. Water 36%
  7. Tapioca Starch 36%
  8. Chicken Liver 27%
  9. Dried Egg Whites 27%
  10. Potato Starch 27%
  11. Chicken Broth 27%
  12. Lamb 27%

On the shelf

Foods that list it

11 foods in our reviews list it. Here are some of them.

Artemis Osopure Grain Free Beef Formula Wet Dog Food44.4% proteinArtemis Osopure Grain Free Chicken Formula Wet Dog Food44.4% proteinArtemis Osopure Grain Free Lamb Formula Wet Dog Food44.4% proteinCanidae All Life Stages , Lamb & Rice Recipe Wet Dog Food36.4% proteinDave’s Pet Food Dave’s Stewlicious Surf & Turf with Chicken and Salmon for Dogs / 13.2 Grain-Free Wet Dog Food40.0% proteinHealth Extension Broth-Licious Ocean Fish in Bone Broth -Shiny Coat Recipe Wet Dog Food54.5% proteinJinx Salmon & Vegetable Bone Broth Stew Wet Dog Food40.0% proteinVerus Canine Fish & Potato Paté Formula Wet Dog Food36.4% protein
Show 3 more Canidae All Life Stages , Multi-Protein Chicken, Lamb and Fish Wet Dog Food40.9% proteinTaste of the Wild High Prairie Canine Recipe with Bison in Gravy Wet Dog Food44.4% proteinArtemis Osopure Grain Free Duck Formula Wet Dog Food44.4% protein

Our read // On the bag

Ask which fish and check the whole food

A high place on a wet food label means more fish by weight before cooking, water included. Read the other animal ingredients and the nutritional adequacy statement. If the bag promises omega-3 or a single protein source, ask the maker which fish it uses and for the finished food's EPA and DHA amounts.

On labels as

Other names for this

One page covers every name. Here is what each label word adds, and whether it changes anything for your dog.

Other wording

Matters for your dog No

Oceanfish

What it means A one-word spelling of ocean fish that names the same broad marine fish ingredient. AAFCO says fish must go by an identifying term, and we found no regulatory definition that makes Oceanfish mean anything different from ocean fish.

For your dog Nothing changes. The joined spelling tells you no more than ocean fish does about the species, the parts used, or the omega-3 and mercury levels, so ask the maker the same questions.8

Sources

What we read

Checked October 1, 2026.

  1. 1 Fish protein substrates can substitute effectively for poultry by-product meal when incorporated in high-quality senior dog diets Journal of Animal Physiology and Animal Nutrition, 2009 // Journal
  2. 2 Protein hydrolysate and oil from fish waste reveal potential as dog food ingredients Frontiers in Veterinary Science, 2024 // Journal
  3. 3 Critically appraised topic on adverse food reactions of companion animals (2): common food allergen sources in dogs and cats BMC Veterinary Research, 2016 // Journal
  4. 4 Impact of Processing Technology on Macro- and Micronutrient Profile of Protein-Enriched Products from Fish Backbones Foods, 2021 // Journal
  5. 5 Five cuts from herring (Clupea harengus): Comparison of nutritional and chemical composition between co-product fractions and fillets Food Chemistry: X, 2022 // Journal
  6. 6 Hazard Analysis and Risk-Based Preventive Controls for Food for Animals: Guidance for Industry U.S. Food and Drug Administration, 2022 // Government
  7. 7 2025 Midyear Meeting Agenda Book AAFCO, 2025 // Regulator
  8. 8 What’s in the Ingredients List? AAFCO, n.d. // Regulator
  9. 9 How Pet Food Is Made Pet Food Institute, n.d. // Industry
An ingredient on its own tells you very little. What matters is how much of it there is and where it sits in the list. That is why we weigh the top five rather than reacting to any single name further down. Back to the wiki

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