Crayfish are decapods pertaining to the phylum arthropoda, which are invertebrates and contain an open-circulatory system.1 The system works by the hemolymph getting re-oxygenated in the gills before being transporting to the heart by brachio-cardiac veins and then pumped to sinuses that bathe tissues with oxygenated hemolymph.2 The crayfish contain a neurogenic heart that depends on neuronal input from cardiac ganglion.3 The neurogenic heart requires nerve impulses to produce contractions in contrast to a myogenic heart that can contract independently from the nervous system.3 The crayfish heart will beat due to the reaction of the ganglion to stimuli in the environment.4 Stimuli will affect the autonomic nervous system in the crayfish that control involuntary actions such as the heart rhythm.4 Neurotransmitters are the chemical signals in which the nervous system regulates both heart rate and contraction.3The autonomic nervous system breaks into two categories as parasympathetic system that is involved in relaxation of organs and the sympathetic system that will stimulate increased activity. Neurotransmitters can either increase or decrease heart rate by altering the patterns in neural activity of the heart.4 Crayfish are poikilotherms, which means they cannot metabolically thermoregulate thus conform to the ambient temperature in the water.
During the interval two patients were censored (2+ and 3+) so that at the end of the interval four patients were still at risk. Since the interval ends with the death of one of those, the chance of surviving the interval is estimated as 3/4. Also notice that at the start of the next interval (4 through 10 years), only three patients were at risk due to the death at the end of the interval. The actual curve plotted from this computation is shown in Fig. 2.3.
In May 1991, zebra mussels were found in the Hudson River. 500 billion of these mussels were found in the course of a year. They looked seemingly harmless, but over time these mussels became a sort of threat. They were destroying the microscopic animals in the river. On the other hand, they also help out by a ton.
Invasive species are “species that is non-native to the ecosystem whose introduction is likely to cause economic and environmental harm”. A example of Invasive species would be the Zebra Mussel. Zebra Mussels or also known as Dreissena polymorpha is a small freshwater mussel. The Zebra Mussels can live up to three-nine years which can grow up to 2 inches. These mussels attach to hard surfaces such as rocks or boats.
Blackfish, a documentary by Gabriela Cowperthwaite, a historically observed impact of the captivity of killer whales. This Documentary focuses on the orca Tilikum, who was captured off the coast of Iceland. On February 21, 1991, Sealand trainer Keltie Byrne fell into the pool with Tilikum. She was pulled to the bottom by Tilikum, tossed around, and drowned. It took Sealand employees two hours to recover her.
It seems not possible that the tiny little fry of goldfish can grow to a monster of nearly 2 feet long. However, that is true. The largest goldfish in captivity is in Netherlands.
There are some pretty bad things going on in the Hudson river. Have you ever seen a zebra mussel. Or even let alone heard of these kinds of creatures. Well let me tell you exactly what is going on in the Hudson river. It’s also very sad as well because entire ecosystem is going down with the recent crazy population of the mussels.
Blackfish (2013) is an American documentary film directed by Gabriela Cowperthwaite and produced by Manuel V. Oteyza. The documentary primarily concerns the controversy of captured Killer Whales at the theme park Sea World, primarily that of Tilikum, an Orca responsible for the deaths of 2010 SeaWorld trainer Dawn Brancheau and two other individuals. The documentary begins with this incident but goes as far back to the 1970 's show the audience how young Orcas are captured in the wild and taken from their families and natural environments. Since its release at the 2013 Sundance Film Festival Blackfish has achieved both critical acclaim and caused controversy regarding SeaWorld 's treatment of its animals as well as retaliation from SeaWorld as to the legitimacy of the film 's claims.
Blackfish is a documentary written about the cruel way the killer whales are treated in SeaWorld. The documentary explains the circumstances in which the killer whales are caught, and the small spaces these huge animals are allowed to live in, which leads to short life span and aggravated behaviors of the otherwise gentle Orcas. The maltreatment is believed to have led the death of several trainers in Canada, America, and Spain, as the killer whales grew increasingly agitated with their conditions. A good documentary film must have a captivating storyline, real interviews, facts and statistics to back up claims, and actual footage. There are several documentaries being released on a weekly basis, in which "claims," are made but later repealed.
Blackfish The documentary Blackfish, directed by Gabriela Cowperthwaite released in July 2013, explores the mistreatment of killer whales and the relationship between the killer whales and trainers as well as the significant problems of the sea-park industry, with a focus upon SeaWorld. Cowperthwaite positions the audience to feel sympathy towards the killer whales by making deliberate choices in sound, visual, language, and structure through the representation of trainers as unprofessional, and whales as mistreated, also experts as reliable information source. Firstly, Cowperthwaite uses effective language techniques to position the audience to view the trainers as undertrained and unprofessional.
There are several interesting underwater animals in the earth 's oceans. Several of them have only recently been discovered. Some like the zombie worms have baffled scientists. Others like the deep sea jellyfish have just shocked scientists. Then, there are some like the yeti crabs, which have just confused scientists with how they survive in the hydrothermal vents near Antarctica.
Severe and sometimes irreversible consequences often accompany the introduction of invasive species. Invasive species may directly compete with native species, contribute to biodiversity, increase predation on native species, and destroy natural habitat, often at an extreme cost to the economy (Morris and Whitfield 2009). In the Caribbean Sea, two species of lionfish, the red lionfish (Pterois volitans) and common lionfish (Pterois miles), have been introduced to the area, and their range is rapidly expanding (Schofield 2009). Lionfish are native to the Indo-Pacific region (Morris et al. 2009) and were likely introduced to the western Atlantic via the marine aquarium trade (Semmens et al. 2004). Their point of introduction is thought to be
DocViewer Page of 2 Zoom Pages Alivia Lindblad 09/25/17 7 th The story "What, of This Goldfish, Would You Wish?" is a three wish folktale. The story has three main characters, Yonatan, Sergei, and The Goldfish. Yoni is a film director and is working on a new documentary that he hopes will become famous and get discovered by famous film producers, or companies.
In the story, “What, of This Goldfish, would You Wish?” is about a man, Sergei Goralick, and his magical goldfish that granted him three wishes. Based on Sergei’s own speech, thoughts, and actions, readers can infer that deep down he is depressed and lonely. Sergei kept himself distant from everyone and was not very fond of strangers knocking on his door. One day a boy, Yonatan, showed up at Sergei’s front steps and insisted on asking questions for a movie he was filming, but Sergei was not appealed. As Yonatan still tried to question he was intrigued by Sergei’s magical goldfish, Sergei became overprotective and killed the boy.
If you had the chance to have any three wishes granted, what would you wish for? In the stories ‘What of This Goldfish’ and ‘The Fisherman and His Wife’ two men were given a certain amount of wishes. Of course, the wishes came with consequences, and the characters had to have had a reason to wish of these wishes. The stories are similar and yet different in many interesting ways, and are both overflowing with hidden themes and morals. The characters of both stories made some good and bad choices for their wishes; wouldn 't you!
