How To Identify Haddock 

Haddock is a saltwater member of the Gadidae family, which includes other codfish such as whiting, pollock, and the Atlantic and Pacific cods, among others.  This is why haddock and cod look so similar and can sometimes be hard to tell apart.  

Compared to other members of the Gadidae group, haddock fish have small mouths and small faces, with tapered bodies that are more rounded on the top than they are on the bottom.  Like other codfish, the haddock features three distinct dorsal fins along its back, with the first being pointed like a triangle. 

This is one identifier for knowing when you’ve caught a haddock, although coloration can help as well. Haddock are colored more deeply near the dorsal fins (deep brown, almost black) and quickly fade to a light gray, silver, or light brown before the color turns silverfish-white on its belly. Its lateral line is black and curves with its sloping upper body. 

When you fish for haddock, most will measure between 14 and 23 inches in length, with weights in the 2- to 8-pound range.  

How To Identify Cod 

Cod belong to the same family as haddock and look a lot like them, but have their own defining characteristics too. They’re generally meatier than the slim haddock, with slightly rounder bellies and producing thicker filets. For this reason (along with prevalence), cod tend to be the more popular of the two fish for eating worldwide. 

The jaw of a cod is uneven, with the lower portion being a little shorter than the upper.  Additionally, cod have a barbel—a single fleshy “whisker” extending from their lower jaw, similar to those you’d see when you land a catfish.  Fish use barbels to seek out food in low visibility. 

Haddock have a barbel too, but it’s much shorter and not as prominent. A long barbel can be a definite giveaway that you’ve caught a cod vs. a haddock. 

Most cod are dark green with lighter bellies. Unlike the dark-on-light lateral line of haddock, cod feature a light lateral line against a darker body. This coloration can be another useful identifier when you aren’t sure which you’ve caught. 

Although both species have three dorsal fins, the frontmost dorsal fins are rounded on cod.  Finally, while haddock have slightly forked tail fins, cod have a uniform one with a straighter edge.

Haddock Vs. Cod  (Key Differences Summarized) 

1. Habitats Compared

The habitats of haddock and cod overlap in some respects. Both species love cool saltwater, with cod being especially fond of colder areas, yet simultaneously more tolerant of warmer, shallower waters than haddock. You’ll find cod in saltwater as shallow as twenty feet sometimes. 

That said, cod also venture into great depths–up to 2,000 feet below the surface. Haddock tend to stay between 130 and 450 feet, usually around 250 or so.  

Cod and haddock prefer roaming the bottom of their habitat, hunting for food, and staying out of sight. Unlike ambush predators, these fish are more likely to wait patiently for food to pass by. 

Haddock spawn in early spring. Cod spawn then too, but can also start in the late winter months.  Both spawn off the bottom, opting to migrate to offshore banks in shallower, warmer waters where their spawn will thrive.  

2. Best Fishing Spots 

Haddock can be found along the coasts of North America and Europe, most notably in the English Channel and along the coastline from North Carolina to Canada.  Cod occupy these places too, but are also found even farther north—in cold waters where haddock usually don’t go. 

The Gulf of Maine and Cape Cod are great fishing spots to catch haddock. Georges Bank, which sits between Cape Cod and Nova Scotia’s Cape Sable Island, boasts an especially abundant stock of haddock. 

When saltwater fishing for cod, you can target Atlantic cod anywhere from Cape Hatteras to New England capes and gulfs, all the way up Canada’s coastline. Pacific cod will be found along the west coast and all the way north to Alaskan waters.  

3. When To Fish (Best Season To Catch Them)  

Haddock are easiest to catch in early spring, just before spawning season.  Summer can prove fruitful as well, however, especially if you’re fishing off a boat and can get your bait or lure into the depths. 

The best time of year to catch cod in most climates is between mid-fall and early spring. Those cold months may mean barren waters when it comes to other fish, but cod love the chilly waters and will venture out of the depths more than they do during spring and summer.  

You can catch either species year-round, though, especially if you’re using a boat. This allows you to travel farther from the shoreline and cast into the depths where both haddock and cod will be. 

Early morning and late afternoon are the best fishing times, when sunlight is minimal and the heat of the day is dissipating.  Both cod and haddock feed during these times and are more likely to notice your bait or lure.  

4. Haddock Or Cod (Which Tastes Better?) 

5. Nutritional Value Compared

Cod is more nutritious than haddock overall since its calorie count is lower.  It also has less sodium and cholesterol but more healthy fats. 

That’s not to say that haddock is unhealthy, though—just that cod is the healthier fish of the two. Both offer amino acids and high protein, along with vitamins and minerals.  They’re also carb-free (assuming you don’t fry them or add a crust, of course), which fits into many popular diets. 

The similar taste, texture, and low oil content of cod and haddock mean you can easily substitute them for one another in most recipes.  

People Also Ask (FAQs)

Which is more expensive: haddock or cod?

Cod tends to be cheaper than haddock due to its abundance, as well as the fact a cod provides more meat than a haddock of the same size. As a result, it runs about a dollar cheaper per pound, depending on the area. Both fish are affordable, though, especially when compared to swordfish, salmon, or bluefin and yellowfin tuna.  

Is cod or haddock more sustainable? 

Both cod and haddock are sustainable when caught recreationally.  For commercial fishing, sustainable catches use lines and feature an MSC Blue Label.  This certification from the MSC (Marine Stewardship Council) ensures that only sustainable methods were used to catch those fish.  

How do haddock & cod compare with halibut & pollock? 

Halibut tastes quite a bit like haddock and cod, but its filets are even thicker.  It also has a firmer texture that holds up better in many recipes. Pollock is milder and less sweet than haddock or cod, with more flakiness.  

Are haddock and cod high in mercury? 

No, these fish are known to be low in mercury and are thus considered very safe to eat. Other low-mercury marine life includes salmon, pollock, clams, and crabs. High-mercury fish include shark, swordfish, and Ahi tuna.  

Can you smoke haddock?  

You can smoke haddock or cod, actually—and since both are so mild tasting, they’ll pair beautifully with your marinades and the flavor of your wood. Haddock is the more common fish to smoke, but this is more of a cultural and regional factor than anything else. Cod is just as delicious when you grill or smoke it properly.  

Should cod be rubbery after cooking?  

Cod and other fish shouldn’t be rubbery or chewy after baking or other preparation methods.  This is a sign you’ve overcooked it, either by leaving it on too long or using too high a temperature. The ideal cooked texture of cod is firm when pressed, and slightly flaky when pierced with a fork.  

Conclusion

Both haddock and cod are consumed worldwide and particularly popular in fried dishes, thanks in part to their mild, sweet flavor and firm texture. Cod and haddock are also fun to catch, even for new anglers.  These saltwater bottom-dwellers are abundant enough to make the sport easy for beginners, while their penchant for deep, cold water makes them a decent challenge for experienced anglers too.