Horseshoe Crabs Essay

Ray McClain). The ‘farmed’ and the wild crawfish are both composed of the same species, the red swamp crawfish (Procambarus clarkii) and the white river crawfish (P. zonangulus). The more popular of the two crustaceans the red swamp crawfish, as it is caught more often is purchased more at the market. There are other crustaceans that are important to the basin besides crawfish, however. Blue crabs (Callinectes sapidus) are a vital resource in Louisiana’s seafood industry. The crabs are harvested by way of traps. In the case that the traps are lost or abandoned, they will continue to catch crabs. This is leading to a downturn in the blue crab population. Fish are also affected by the traps, as they are also caught. Despite the risked to the crab population, , the Marine Stewardship Council recognized the Louisiana blue crab fishery as the only sustainable blue crab fishery in the world in March of

Gregg Canes Contributed from Santa Monica. "California Bill Would Ban Orca Shows at SeaWorld." CNN. Cable News Network, 07 Mar. 2014. Web. 04 Apr. 2014. .

Crabs spawn near the mouth of the Bay in Virginia water, therefore few sponge crabs (female crabs carrying eggs) are seen in Maryland (“Chesapeake Wildlife”). Juvenile crabs migrate northward to feed and grow in the brackish creeks of the Tidewater.

The life cycle of a Blue Crab involves Zoeae, Megalops, Juveniles, and Adulthood (Zinski, 2006) (“Blue Crab Life Cycle, 2016). Mating occurs only once for female crabs. Female crabs undergo a pubertal mold which is indicative of a sexually mature state in their life cycle. During the pubertal molt females release pheromones which attract males. The actual ritual of mating does not occur until females molt their shells (Zinski, 2006). At which point females will then retreat to high salinity water to begin spawning. Spawning will occur for the first time 2-9 months after mating. Interestingly, males will protect females during the period which females have molted and it is at this point in which mating occurs (Hill, 2004).

significantly impact loggerhead nesting by making many current or potential nesting sites unviable (Ehrhart et al.).

Horseshoe crabs live in the Delaware Bay and give birth to their offspring there. At this time the red knots, a type of bird, migrate to the area to collect food. The food they collect is the newly conceived horseshoe crab eggs that are buried along the shore sand.

Three years ago, the author took a trip to Delaware. As his family was walking on the beach they came across some horseshoe crabs mating. He wondered how they have changed. The type of horseshoe crab he saw along the beach was called “limulus polyphemus”. Limulus Polyphemus is not found in the fossil records. The fossil record for horseshoe crabs is deeper than 20 million years, and the

The Purple Marsh Crab, or simply known as the Marsh Crab, is a small crab that is native to the Eastern United States. They live in the salt marshes and mud flats of brackish estuaries, and create networks of connected tunnels within the flats.

Their target prey is usually fish (both bony fish, and sharks and rays). They will also eat crustaceans, sea turtles, cetaceans (such as dolphins), and squid.

Knowing how many horseshoe crabs there are helps fisheries managers develop effective policy for managing populations. You can help by volunteering to count the crabs in May and June.

Under the aspect of Narration, we have 3 basic modes of film making which is your Narrative film, or your everyday films, Experimental films, which are your Avant Garde Films, but then there’s one type that is overlooked by most and that is your Documentary film whose purpose is to inform and influence the audience perception on an issue or topic that is usually factual. In the movie, Blackfish, we can really see how documentary film differ from those of other narrative films. In the movie, Blackfish, the director of the movie is trying to inform the public of what is happening to the Orcas, or Killer Whales, in captivity and the how a multitude of trainers who swim with those Orcas have been injured and how at least 3 or more have died from interacting with the Orcas.

Legs are long with front two pairs of legs directed forward, while the rear two pairs of legs are directed backwards. Each distal leg tip has 3 claws. Common in forest edges, gardens, fallow fields, farms and orchards. The spiders prey are insects caught in the web, though they will occasionally capture lizards. These spiders seldom enter the home, though they may build nests between trees, and shrubs and the homes walls. Contact The Bug Dude for professional pest control in Fort Worth to rid your home and property of pests.

This lab is based off of European Green Crabs preying on Periwinkle Snails. From the name, one can tell the European Crab originated in Europe and is not native to North America. The crab ranged its expansion north of Cape Cod, where Periwinkle snails were introduced to a new predator. (McRae, 2015-pg. 1)

The purpose or the significance of the experiment was to see if brine shrimp can survive in different salinities of saltwater. The experimental (alternative) hypothesis was supported, because in figure 1 it showed that there was an increase of the average (mean) of survival rate of the brine shrimp when the salinity level (in grams) increased. It was in Figure 1 and it shown that the rates had higher numbers (increased survival rates) and the lower salinities had lower survival rates. The raw data also had shown that higher numbers were in the higher salinities rather than in the lower salinities. The salt had an effect on the Brine Shrimp, is because the more the more salt they had (being a saltwater species) would lead to more surviving unlike a lower salinity which did not have enough salt to support the DV (the Brine Shrimp).

4. The life cycle of the Clonorchis Sinensis starts as an egg. It is laid in the biliary ducts and stool. It will then migrate from the snail to free-swimming in water. Then they will migrate to a fish. Maturation takes about 1 month. The Adults live in the Biliary ducts.