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Winter Skate
The winter skate (''Leucoraja ocellata'') is a globally endangered species of skate found in the surrounding waters of northeastern North America. They inhabit shallow shelf waters and are prone to becoming a bycatch during commercial fishing. They are divided into three populations, or designable units (DU), including the Gulf of St. Lawrence population (GSL); the Eastern Scotian Shelf and Newfoundland population (ESSN); and the Western Scotian Shelf population. Description Winter skate can grow up to 109 cm (43 inches), reaching maturity around 12 years of age, depending on the sex and location. The skate's fins are used for swimming, while its tail remains stiff during most movements. Winter skates are light brown and have small dark spots along the dorsal side of their body. They also have small spines covering most of their disk and tails. ''L. ocellata'' usually have one to four ocelli, eye-like markings, on the upper surface of the disk, which each have a dark br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endangered Species
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching, invasive species, and climate change. The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas. Many nations have laws that protect conservation-reliant species which, for example, forbid hunting, restrict land development, or create protected areas. Some endangered species are the target of extensive conservation efforts such as captive breeding and habitat restoration. Human activity is a significant cause in causing some species to become endangered. Conservation status The conservation status of a species indicates the likelihood that it will become extinct. Multiple factors are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extirpate
Local extinction, also extirpation, is the termination of a species (or other taxon) in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinctions. Local extinctions mark a change in the ecology of an area. It has sometimes been followed by a replacement of the species taken from other locations, such as with wolf reintroduction. Discussion Glaciation is one factor that leads to local extinction. This was the case during the Pleistocene glaciation event in North America. During this period, most of the native North American species of earthworm were killed in places covered by glaciation. This left them open for colonization by European earthworms brought over in soil from Europe. Species naturally become extinct from islands over time; this can be either local extinction if the species also occurs elsewhere, or in cases of island endemism, outright extinction. The number of species an island can support is l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three-spined Stickleback
The three-spined stickleback (''Gasterosteus aculeatus'') is a fish native to most inland and coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation throughout its range, ideal for questions about evolution and population genetics. Many populations are anadromous (they live in seawater but breed in fresh or brackish water) and very tolerant of changes in salinity, a subject of interest to physiologists. It displays elaborate breeding behavior (defending a territory, building a nest, taking care of the eggs and fry) and it can be social (living in shoals outside the breeding season) making it a popular subject of inquiry in fish ethology and behavioral ecology. Its antipredator adaptations, host-parasite interactions, sensory physiology, reproductive physiology, and endocrinology have also been much studied. Facilitating these studies is the fact that the three-spined stickleback is easy to find in nat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Herring
Atlantic herring (''Clupea harengus'') is a herring in the family Clupeidae. It is one of the most abundant fish species in the world. Atlantic herrings can be found on both sides of the northern Atlantic Ocean, congregating in large schools. They can grow up to in length and weigh up to . They feed on copepods, krill and small fish, while their natural predators are seals, whales, cod and other larger fish. The Atlantic herring fishery has long been an important part of the economy of New England and the Atlantic provinces of Canada. This is because the fish congregate relatively near to the coast in massive schools, notably in the cold waters of the semi-enclosed Gulf of Maine and Gulf of St. Lawrence. North Atlantic herring schools have been measured up to in size, containing an estimated four billion fish. Description Atlantic herring have a fusiform body. Gill rakers in their mouths filter incoming water, trapping any zooplankton and phytoplankton. Atlantic herri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siliqua (bivalve)
''Siliqua'' is a genus of saltwater razor clams, marine bivalve molluscs in the family Pharidae, the razor clams and jackknife clams. Species Species in the genus ''Siliqua'' include:WoRMS (2009). Siliqua Megerle von Muhlfeld, 1811. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=159997 on 2010-06-22 * '' Siliqua albida'' ( Adams & Reeve, 1850) * '' Siliqua alta'' ( Broderip & Sowerby, 1829) – northern or Arctic razor clam * '' Siliqua barnardi'' M. Huber, 2010 * '' Siliqua costata'' ( Say, 1822) – Atlantic razor clam * '' Siliqua fasciata'' (Spengler, 1794) * '' Siliqua grayana'' ( Dunker, 1862) * '' Siliqua herberti'' M. Huber, 2015 * '' Siliqua japonica'' Dunker, 1861 * '' Siliqua lucida'' ( Conrad, 1837) * '' Siliqua minima'' (Gmelin, 1791) * '' Siliqua patula'' Dixon, 1789 - Pacific razor clam * '' Siliqua polita'' ( W. Wood, 1828) * '' Siliqua pulchella'' Dunker, 1852 * '' Siliqua radiata'' (Linnaeus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cancer Irroratus
Description ''This crab species occurs on the eastern coast of North America, Labrador Canada to Iceland to South Carolina. Rock crabs live over a large depth range, from well above the low tide line to as deep as . And live up to 8 years. Cancer irroratus'' has nine marginal teeth on the front edge of the carapace beside each eye, and reaches a carapace width of . These crabs are similar in color to, and overlap in size with, the Jonah crab, ''Cancer borealis''. The two species can indeed be distinguished by the purplish-brown spots on the carapace of ''C. irroratus'' (contrasting with the yellow spots of ''C. borealis''), and by the smooth edges to the teeth on the edge of the carapace (denticulate in ''C. borealis''). Males can range up to 8–127mm, while females can range up to 113mm. The Rock Crabs, they usually molt in between the months of April and July. The two fount claws of the crab are very important because they are the ones that can grab pray as well as holding it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winter Flounder
The winter flounder (''Pseudopleuronectes americanus''), also known as the black back, is a right-eyed ("Sinistral and dextral, dextral") flatfish of the family Pleuronectidae. It is native to coastal waters of the western north Atlantic Ocean, Atlantic coast, from Labrador, Canada to Georgia (U.S. state), Georgia, United States, although it is less common south of Delaware Bay. It is the most common near-shore (shallow-water) flounder in the waters from Newfoundland down through Massachusetts Bay, reaching a maximum size around 61 cm in length and 2.25 kg in weight. The species grows larger on Georges Bank, where they can reach a length of 70 cm and weight of 3.6 kg. Although winter flounder historically supported large commercial and recreational fisheries, biomass and landings have decreased since the 1980s. Life cycle Winter flounder lay up to 3.3 million demersal, adhesive eggs that are retained within their spawning grounds. Depending on temperature, larv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rainbow Smelt
The rainbow smelt (''Osmerus mordax'') is a North American species of fish of the family (biology), family Osmeridae. Walleye, trout, and other larger fish prey on these smelt. The rainbow smelt prefer juvenile cisco (fish), ciscoes, zooplankton such as Calanoida, calanoid copepods (''Leptodiaptomus ashlandi'', ''Leptodiaptomus minutus, L. minutus'', ''Leptodiaptomus sicilis, L. sicilis''), and other small organisms, but are aggressive and will eat almost any fish they find. They are anadromous spring spawners and prefer clean streams with light flow and light siltation. The rainbow smelt face several barriers. They are weak swimmers and struggle to navigate fish ladders preventing them from making it past dams to the headwater streams where they spawn. The rise in erosion and dams helped to decimate the smelt population in the 1980s. There are currently plans to try to reduce damming and to help control erosion. Description The body of the rainbow smelt is slender and cylindric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sand Lance
A sand lance or sandlance is a ray-finned fish belonging to the family Ammodytidae. Several species of sand lances are commonly known as " sand eels", though they are not related to true eels. Another variant name is launce, and all names of the fish are references to its slender body and pointed snout. The family name (and genus name, '' Ammodytes'') means "sand burrower", which describes the sand lance's habit of burrowing into sand to avoid tidal currents. Sand lances are most commonly encountered by fishermen in the North Pacific and North Atlantic, but are found in oceans throughout the world. These fish do not have pelvic fins and do not develop swim bladders, staying true to their bottom-dwelling habit as adults. Both adult and larval sea lances primarily feed on copepods. Larval forms of this fish are perhaps the most abundant of all fish larvae in areas such as the northwest Atlantic, serving as a major food item for cod, salmon, whales and other commercially impo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crangon Septemspinosa
''Crangon septemspinosa'' (sand shrimp), also known as seven-spined bay shrimp, is a species of shrimp commonly found along the Atlantic coast of North America, with a wide range spanning from Newfoundland to eastern Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic .... Sand shrimp is often found in eelgrass beds, salt marshes, and estuaries and can be found at depths to . At maturity, they can reach about 7 to 7.5 cm in length. Its name derives from the sand-like coloration that helps camouflage the species with its environment. Description Sand shrimp is a nocturnal species, which means that it is much more active in dark environments rather than light ones. This increased rate of activity is also more prominent in high temperature environments, as indicated by an increase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shrimp
A shrimp (: shrimp (American English, US) or shrimps (British English, UK)) is a crustacean with an elongated body and a primarily Aquatic locomotion, swimming mode of locomotion – typically Decapods belonging to the Caridea or Dendrobranchiata, although some Shrimp#Non-decapods, crustaceans outside of this order are also referred to as "shrimp". Any small crustacean may also be referred to as "shrimp", regardless of resemblance. More narrow definitions may be restricted to Caridea, to smaller species of either of the aforementioned groups, or only the Marine life, marine species. Under a broader definition, ''shrimp'' may be synonymous with prawn, covering stalk-eyed swimming crustaceans with long, narrow muscular tails (Abdomen#Arthropoda, abdomens), long whiskers (Antenna (biology), antennae), and slender, Biramous, biramous legs. They swim forward by paddling the swimmerets on the underside of their abdomens, although their escape response is typically repeated flicks wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fullness Index Winter Skate
Satiety ( /səˈtaɪ.ə.ti/ ''sə-TYE-ə-tee'') is a state or condition of fullness gratified beyond the point of satisfaction, the opposite of hunger. Following satiation (meal termination), satiety is a feeling of fullness lasting until the next meal. When food is present in the GI tract after a meal, satiety signals overrule hunger signals, but satiety slowly fades as hunger increases. The satiety center in animals is located in ventromedial nucleus of the hypothalamus. Mechanism Satiety is signaled through the vagus nerve as well as circulating hormones. During intake of a meal, the stomach must stretch to accommodate this increased volume. This gastric accommodation activates stretch receptors in the proximal (upper) portion of the stomach. These receptors then signal through afferent vagus nerve fibers to the hypothalamus, increasing satiety. Signalling factors In addition, as the food moves into the duodenum, duodenal cells release multiple substances that affect dige ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
