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All octopuses [25] and most cephalopods [26] [27] are considered to be color blind. Coleoid cephalopods (octopus, squid, cuttlefish) have a single photoreceptor type and lack the ability to determine color by comparing detected photon intensity across multiple spectral channels.
In most parts of the world, fish are generally not considered seafood even if they are from the sea. In the US, the term "seafood" is extended to fresh water organisms eaten by humans, so any edible aquatic life may be broadly referred to as seafood in the US.
The giant squid, which until recently had not been observed alive in its adult form, [27] is one of the largest invertebrates, surpassed in weight but not in length by the colossal squid. [ 28 ] Freshwater and terrestrial molluscs appear exceptionally vulnerable to extinction.
Seafood is any form of sea life regarded as food by humans, prominently including fish and shellfish.Shellfish include various species of molluscs (e.g., bivalve molluscs such as clams, oysters, and mussels, and cephalopods such as octopus and squid), crustaceans (e.g. shrimp, crabs, and lobster), and echinoderms (e.g. sea cucumbers and sea urchins).
Despite the name, shellfish are not fish. [2] Most shellfish are low on the food chain and eat a diet composed primarily of phytoplankton and zooplankton . [ 3 ] Many varieties of shellfish, and crustaceans in particular, are actually closely related to insects and arachnids ; crustaceans make up one of the main subphyla of the phylum Arthropoda .
In the Hanafi school, one of the four Sunni schools, only "fish" (as opposed to all "sea game") are permissible, including eel, croaker and hagfish.. Any other sea (or water) creatures which are not fish, therefore, are also makruh tahrimi (forbidden but not as the same level as haram) whether they breathe oxygen from water through gills (such as prawns, lobsters and crabs, which are ...
The nutritional value of squid compares favorably with fish, being high in protein and phosphorus with trace amounts of calcium, thiamine, and riboflavin. [17] Squid are 67.5–80.7% protein and 2.22–8.48% fat. [ 18 ]
Shellfish allergy is among the most common food allergies."Shellfish" is a colloquial and fisheries term for aquatic invertebrates used as food, including various species of molluscs such as clams, mussels, oysters and scallops, crustaceans such as shrimp, lobsters and crabs, and cephalopods such as squid and octopus.