Fresh water fish have much lower iodine, but aren't used for sushi.

Low Iodine Diet | American Thyroid Association
Photo provided by Flickr
Shellfish, as well as other fish (fin fish) and seaweed, contain Iodine that has leached into seawater from the soil. Some of the iodine is retained in shellfish and fin fish, and can serve as a source of iodine through human consumption. We need iodine in order to have proper thyroid function. For this reason, many years ago, iodine was added to table salt and other seasonings as an additional source, particularly for inland dwellers with diets relatively low in seafood.
i know seafood/shellfish is high in iodine and should be avoided. but are there any fish that are low in iodine AND high in omega-3 fatty acids?
Photo provided by Flickr
In 1978–1979, the average iodine intake in Iceland was estimated to be 336 µg/person/day. In a follow-up study, urinary iodine excretion (UIE) was 395 µg/day in men and 270 µg/day in women (). In 1990, the Icelandic Nutrition Council reported an average iodine intake of 299 µg/person/day (). In that survey, for the first time, a subgroup that was potentially at risk of ID was identified: young women with a low intake of fish and dairy products and with an iodine intake in the range of 86–130 µg/day (). ABSTRACT. The fish rhabdovirus infectious hematopoietic necrosis virus (IHNV) was rapidly inactivated by extremely low concentrations of iodine in water.
Photo provided by FlickrThe fish rhabdovirus infectious hematopoietic necrosis virus (IHNV) was rapidly inactivated by extremely low concentrations of iodine in water
Photo provided by FlickrShe does not care water fish. Salmon is her favorite. She does like other ocean fish as well. So we were wondering which ocean fish would be lower in iodine.
Photo provided by Flickr
If we are following a low iodine diet, are all fish varieties off limits, or are there any fish that are low iodine? I am having trouble finding information about iodine in foods and wonder why they don't put the iodine content on the nutrition labels for everything? They have the iodine content on some things, but not everything. It is frustrating! I wonder if I should stay away from fish because of the heavy metals that are being found in most of them, anyway? Does anyone have any advice? I would appreciate it!All statistical analyses were performed with JMP software (Version 7), except for prevalence of elevated serum Tg values for which a Fisher exact test was performed with SAS software (Version 9). A chi-square test was used to compare the prevalence of TD risk factors in the three groups. Age and estimated dietary iodine intake results are expressed as mean ± standard deviation (SD). Comparison of age, mean serum Tg values, and estimated mean dietary iodine intake for the three groups was performed by ANOVA, followed by pairwise comparisons using the Tukey-Kramer HSD method (α = 0.05). Data of serum Tg values were log-transformed before analysis in order to stabilize variances. Mean and median of serum Tg were calculated on transformed data.The fish rhabdovirus infectious hematopoietic necrosis virus (IHNV) was rapidly inactivated by extremely low concentrations of iodine in water. A 99.9% virus reduction was obtained in 7.5 s when virus (105 PFU/ml) and iodine (0.1 mg/liter, final concentration) were combined in distilled-deionized or hatchery water. Iodine efficacy decreased at pHs greater than 7.5 or when proteinaceous material was added to the water. Bovine serum albumin blocked iodine inactivation of the virus more effectively than did equal concentrations of fetal bovine serum or river sediment. Sodium thiosulfate effectively neutralized free iodine. Powder, iodophor, and crystalline iodine solutions inactivated IHNV equally. Iodine rapidly inactivated IHNV isolates representing each of the five electropherotypes. Under the conditions used in this study, inactivation was not affected by temperature, salinity, or water hardness. When Dworshak National Fish Hatchery water was continuously treated to provide a free iodine concentration of 0.14 mg/liter, a 7.5-s exposure to iodine was sufficient to inactivate 99.9% of the IHNV. Iodine added to water that contained IHNV prevented infection of rainbow trout (Oncorhynchus mykiss) fry. These results suggest that the waterborne route of IHNV transmission can be blocked by adding low iodine concentrations to the water supplies of hatcheries.In the past few decades, the incidence of thyroid cancer has rapidly increased worldwide. Thyroid cancer incidence is relatively high in regions where the population's daily iodine intake is insufficient. While low dietary iodine has been considered as a risk factor for thyroid cancer development, previous studies found controversial results across different food types. Among different ethnic groups, dietary factors are influenced by various dietary patterns, eating habits, life-styles, nutrition, and other environmental factors. This review reports the association between dietary factors and thyroid cancer risk among ethnic groups living in different geologic regions. Iodine-rich food such as fish and shellfish may provide a protective role in populations with insufficient daily iodine intake. The consumption of goitrogenic food, such as cruciferous vegetables, showed a positive association with risk. While considered to be a risk factor for other cancers, alcohol intake showed a protective role against thyroid cancer. High consumption of meat such as chicken, pork, and poultry showed a positive association with the risk, but dairy products showed no significant association. Regular use of multivitamins and dietary nitrate and nitrite also showed a positive association with thyroid cancer risk. However, the study results are inconsistent and investigations into the mechanism for how dietary factors change thyroid hormone levels and influence thyroid function are required.