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The shovelnose sturgeon (Scaphirhynchus platorynchus) [5] is the smallest species of freshwater sturgeon native to North America. It is often called hackleback , sand sturgeon , or switchtail . Switchtail refers to the long filament found on the upper lobe of the caudal fin (often broken off as adults).
The guitarfish, also referred to as shovelnose rays, are a family, Rhinobatidae, of rays. The guitarfish are known for an elongated body with a flattened head and trunk and small, ray-like wings. The combined range of the various species is tropical, subtropical, and warm temperate waters worldwide.
In 2010, Greenpeace International added the American angler (Lophius americanus), the angler (Lophius piscatorius), and the black-bellied angler (Lophius budegassa) to its seafood red list—a list of fish commonly sold worldwide with a high likelihood of being sourced from unsustainable fisheries.Red List Fish [41] [42]
These fish feed on fish and crustaceans, and as adults are largely piscivorous. [3] Sorubim species have been observed in captivity to excavate a small pit as a nest and even to guard freshly hatched young (unfortunately, none of these young survived). [3] These fish are nocturnal and occur in groups or schools. [8] [11]
As of July 2017, the International Union for Conservation of Nature (IUCN) listed 1,000 critically endangered fish species, including 87 which are tagged as possibly extinct. [1] [2] Of all evaluated fish species, 3.0% are listed as critically endangered. The IUCN also lists four fish subspecies as critically endangered.
The shovelnose guitarfish (Pseudobatos productus) is a ray in the family Rhinobatidae. P. productus was first described by ichthyologist William Orville Ayre in 1854 as Rhinobatos productus , [ 2 ] with the genus derived from the Greek word rhinos, meaning nose, and the Latin word batis, meaning ray. [ 3 ]
The Syr Darya sturgeon (Pseudoscaphirhynchus fedtschenkoi), or Syr Darya shovelnose sturgeon, [1] is a species of fish in the family Acipenseridae. It is found in Kazakhstan, Tajikistan and Uzbekistan, where it is endemic to the Syr Darya River and, before its drainage, the Aral Sea .
The Amu Darya sturgeon feeds on small fish and aquatic insect larvae, with large individuals being mostly piscivorous. [1] [5]Studies in the 1960s and 1970s showed that Amu Darya sturgeon reach maturity when 5–8 years old (slightly later in females than males), but in the 1990s the youngest mature individuals only were 4 years old, possibly due to environmental changes in their habitat. [7]