0_Wizard
I found it surprising that some shellfish are found in freshwater.
Although most kinds of shellfish are harvested from saltwater environments, some kinds are found in freshwater.
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Shellfish
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Shellfish Association of Great Britain
The Shellfish Association of Great Britain (SAGB) is a historic association that was founded as the Oyster Merchants’ and Planters’ Association in 1903, it was renamed the SAGB in 1969. They cover a wide range of topics within the shellfish industry, from trading to advice on nutritional standards and also the sustainability of the industry. The SAGB is the Shellfish industry’s trade body with the director and staff based at Fishmongers’ Hall which is also home to the Worshipful Company of Fishmongers and can be found in the City of London. The SAGB consists of a wide range of members located within the Shellfish farming and fishing industry, within commercial companies and traders of Shellfish products, the Seafish Industry Authority and the major Sea Fisheries Committees.
Bivalvia
Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing.
Shellfish
Shellfish is a culinary and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater environments, some kinds are found in freshwater. In addition, a few species of land crabs are eaten, for example "Cardisoma guanhumi" in the Caribbean. Despite the name, shellfish are not a kind of fish, but are simply water-dwelling animals. Many varieties of shellfish (crustaceans in particular) are actually closely related to insects and arachnids, making up one of the main classes of the phylum Arthropoda.
Harmful algal bloom
A harmful algal bloom (HAB) are organisms that can severely lower oxygen levels in natural waters, killing marine life. Some HABs are associated with algae-produced toxins. Blooms can last from a few days to many months. After the bloom dies, the microbes which decompose the dead algae use up even more of the oxygen, which can create fish die-offs. When these zones of depleted oxygen cover a large area for an extended period of time, they are referred to as dead zones, where neither fish nor plants are able to survive. HABs are induced by an overabundance of nutrients in the water. The two most common nutrients are fixed nitrogen (nitrates, ammonia, urea) and phosphate.
Effects of global warming on human health
The effects of global warming include its gayon human health. The observed and projected increased frequency and severity of climate related impacts will further exacerbate the effects on human health. This article describes some of those effects on individuals and populations. A good example of the impact of global warming on health can be seen in the disease Erythromelalgia. This is a vascular disease that is commonly triggered by the involvement of change in temperature, which leads to syndromes including (first and second degree) burning pain, increased temperature, erythema and swelling, of mainly the hands and feet that are affected.
Mussel
Mussel is the common name used for members of several families of bivalve molluscs, from saltwater and freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, which are often more or less rounded or oval. The word "mussel" is most frequently used to mean the edible bivalves of the marine family Mytilidae, most of which live on exposed shores in the intertidal zone, attached by means of their strong byssal threads ("beard") to a firm substrate. A few species (in the genus "Bathymodiolus") have colonised hydrothermal vents associated with deep ocean ridges.
Fish as food
Many species of fish are consumed as food in virtually all regions around the world. Fish has been an important source of protein and other nutrients for humans from time immemorial. In culinary and fishery contexts, "fish" may include shellfish, such as molluscs, crustaceans and echinoderms. English does not distinguish between "fish" as an animal and the food prepared from it, as it does with "pig" vs. "pork" or "cow" vs. "beef". Some other languages do, as in the Spanish " versus ". The modern English word for fish comes from the Old English word "fisc" (plural: "fiscas") which was pronounced as it is today.