Hong Kong’s Consumer Council (CC) has released findings from a major comprehensive review of 46 types of widely consumed canned fish, highlighting significant nutritional variance, particularly in sodium content, among seven tested samples of popular canned dace. The study, published in the latest issue of Choice magazine, revealed that the sodium per 100 grams of dace could differ by nearly 100%, emphasizing health risks linked to excessive consumption, while also identifying one top-scoring brand praised for its lower contaminant levels.
The test, which sampled canned fish collected from various supermarkets and department stores at prices ranging from HK$15.9 to HK$23.9 per can, focused rigorously on both safety and nutritional profiles. Researchers separated the fish components from the sauces and other ingredients to accurately assess the core product. Safety testing included screening for multiple heavy metals—such as antimony, inorganic arsenic, cadmium, lead, and mercury—along with banned coloring agents and polychlorinated biphenyls (PCBs). Nutritional analysis tracked energy, protein, various fats, carbohydrates, sugar, calcium, and sodium.
High Sodium Concentrations Raise Health Concerns
A primary finding of the review centered on the unexpectedly high levels of sodium found across the preserved dace samples, often attributed to the traditional pickling and deep-frying methods used in preparation. The average dace sample contained the highest sodium concentration among all fish types tested.
Four specific brands—Tin Lung, Eagle Coin, Pearl River Bridge, and Great Wall—registered alarming sodium levels exceeding 1,000 milligrams per 100 grams of the fish component alone. This concentration classifies the brands as “high sodium.” Consumers often miscalculate intake, as nutrition labels typically represent the entire product, including highly salted ingredients like fermented black beans (douchi) and oil.
For instance, the label for the highest sodium sample, a variety from Eagle Coin, suggested a quarter-can serving (55g) contained approximately 283mg of sodium. However, consuming the entire can would result in an estimated intake of 880mg of sodium—significantly surpassing 40% of the World Health Organization’s recommended daily limit for adults and over 50% of the suggested daily intake for a 7-year-old child. Consumers are strongly advised to monitor serving sizes carefully to mitigate these health risks, particularly hypertension.
Safety and Nutritional Trade-offs
Despite the sodium concerns, overall safety compliance was strong. All dace samples detected traces of metal contaminants, but none exceeded the maximum limits set by current Hong Kong regulations, earning them high safety scores (four to five stars). Only one sample, Pearl River Bridge, contained trace amounts of dioxin-like PCBs, though the exposure level was deemed low enough not to pose an immediate threat unless consumed in extremely large quantities over time.
One product, Eagle Coin’s Gold Award Douchi Dace (priced at $23.9), achieved the maximum five-star overall rating, reflecting an excellent balance of controlled contaminants and overall safety.
The CC report also shed light on other nutritional elements:
- Calcium Boost: Canned fish offers a valuable source of calcium due to the heat and pressure process that softens the bones, allowing them to be consumed. The highest calcium content (910 mg per 100 grams of fish) was found in a sample from Kam Chuk Brand. This single serving could provide nearly the entire recommended daily calcium intake for a 7-year-old.
- Omega-3s Lower: While protein levels were comparable across canned fish varieties, canned dace generally exhibited the lowest combined levels of DHA and EPA (Omega-3 fatty acids) compared to other canned fish tested.
Implications for Consumer Choices
These findings underscore the importance of scrutinizing nutritional labels, especially for processed convenience foods like canned fish, which are staples in many Hong Kong households. Consumers prioritizing cardiovascular health should seek out options with lower sodium content.
The CC simultaneously released data from a related test on 30 brands of bottled water, noting that while no brands exceeded local safety limits for heavy metals or microplastics, some brands did show detectable levels of plasticizers (DBP and DINP) and low levels of nitrates/nitrites.
The Consumer Council encourages the industry to reformulate traditional recipes to offer lower sodium options without compromising quality, allowing Hong Kong residents to enjoy this convenient protein source more safely. Consumers can consult the full study results in the latest issue of Choice magazine for detailed product comparisons and ratings.