Crayfish Lab Report

The purpose of this lab was to answer the question, “Of the saline solutions of 0%, 0.5%, 1%, 1.5%, and 2% sodium chloride (NaCl), which solution will yield the highest hatching viability for the brine shrimp?” The hypothesis was that the saline solution most precise to the concentration of NaCl in seawater, which is approximately 3.5%, will yield the highest hatching viability. Therefore, the 2% NaCl solution will yield the highest hatching viability.

In this experiment, an oxygen-measuring probe was attached to an oxygen chamber in order to quantify oxygen consumption rate, which served as a substitute measure for metabolic rate. The oxygen-measuring probe provided real-time measurements of dissolved oxygen (DO) concentration present in the chamber water. The oxygen chamber was sealed to create a closed system so that over time, the oxygen levels would decrease as the goldfish respired and consumed the oxygen present in the water. The software LoggerLite was used to record real-time DO concentration measurements.

When society thinks about crayfish and earthworms they become extremely curious about how their bodies operate because of how they are made up. I will give a brief synopsis of both animals before going into major detail about them. According to the online website named dictionary.com, it says that an earthworm is a burrowing annelid worm that lives in the soil. Earthworms play an important role in aerating and draining the soil and in burying organic matter (Dictionary). Crayfish are nocturnal freshwater crustacean that resembles a small lobster and inhabits in streams and rivers (Dictionary). Crayfish and earthworms are some very interesting animals that possess some exclusive qualities both similar and different.

The removal method of Ringed Crayfish data collection was over a sample site area of 50m2 at Pearson Creek, a stream, containing a density of 5.18 crayfish/m2. The sample site was collected in 5m in width by 10m in height with wet, rocky, and grassy conditions. The data collection incorporated five different samples of the number of crayfish removed from the stream each time (Figure 1). Sample one caught 53 Ringed Crayfish with 0 crayfish caught prior. Sample two caught 37 Ringed Crayfish with 53 crayfish caught prior. Sample three caught 42 Ringed Crayfish with 90 crayfish caught prior. Sample four caught 26 Ringed Crayfish with 132 crayfish caught prior. Sample five caught 18 Ringed Crayfish with 158 crayfish caught prior. What was caught in the previous sample was added into the total amount of crayfish caught prior. A negative linear relationship is displayed by data collected in Figure

Most people would not appreciate a stranger walking into their home unannounced, taking their food, and making themselves at home. That is exactly what lionfish are doing along the Florida coastline. Lionfish are an invasive species that need to be contained. The reefs that they consistently invade off of the coast of the Florida are not the lionfish's natural habitat. This invasive species takes shelter and resources out of the reef that other species need to survive, and they destroy the environment around them. Humans have complicated the balance of the ecosystem by introducing lionfish, and now they need to help rectify the situation.

Crayfish can tolerate different conditions related to temperature, salinity and stress. To survive during loss of water, they migrate to another area where water is available, or they burrow. During this process, their heart rate and metabolism is constantly

The Impact Lionfish is quite dangerous because they damage marine aquatic ecosystems by decimating life on reefs. The way lionfish causes the damage is by eating small fish who keep the reefs healthy. Lionfishes can live a while without eating. While being 3 months or longer that they don’t really have to eat. Which can help them live while unlike the food they eat can’t survive that long without eating.

Zebrafish (Danio rerio) are a popular freshwater fish that have been modified by researchers to produce several transgenic strains. The strain of transgenic zebrafish that express fluorescent colors have been given the name Glofish, for they contain different fluorescent proteins such as Green Fluorescent Protein (GFP), Red Fluorescent Protein (RFP), Yellow Fluorescent Protein (YFP), Blue Fluorescent Protein (BFP), or Purple Fluorescent Protein (PFP) (Vick, B. M., A. Pollak, C. Welsh, J. O. Liang, 2012). There are several benefits of using Glofish as a model to portray and understand inheritance patterns of transgenic genes. Glofish are small size in size, produce a high number of progeny, have similar genetic control to humans,

Zebrafish were shipped overnight from Carolina Biological on Wednesday February 3, 2016 at 11:00am. Dr. Martin received zebrafish eggs in Development biology office, and then decides to transfer zebrafish eggs in development biology lab. Next, Dr. Martin checks the temperature of the room, 48 degrees Celsius, a little below 80 degrees Celsius. The temperature range is around 80-90 degrees Celsius in the lab room, and the organism is in temperature dependent. Next, Dr. Martin chooses a cabinet to place the eggs inside. Then, she had a thermometer inside the cabinet to check the temperature when door is closed. The thermometer still read as 78 degrees Celsius. Zebrafish arrived in two separate bags. Dr. Martin labels the two bags A and B. Also,

Signal crayfish has become widespread through Europe in the last century due to human activities. Signal crayfish poses a threat for the endemic noble crayfish in most of the European countries as a vector of the crayfish plague and competition. As an invasive species, signal crayfish can alter the energy flow of the ecosystem through the food webs since, as omnivorous, it can feed from several trophic level, modifying the ecosystem assemblage. On the other hand, the noble crayfish is endangered due to several factors like water pollution, ecosystem alteration and crayfish plague; consequently, their restauration may be not possible. Therefore, this review aims to compile the effects of the invasive signal crayfish in European freshwater

Despite its apparent lack of a central coordinating nervous system (no brain), Pycnopodia has a repertoire of sensory systems to locate and capture its prey. Its simple nervous system takes the form of a central ring, with radial nerves extending into each of its rays. Each ray is covered with thousands of tiny tubed feet that provide tactile information such as touch, temperature and body position. At the end of each ray are specialized tube feet filled with sensory cells that detect chemical cues and trigger sensations of taste and smell. Light sensory organs (red spots or eye spots) at the tip of each ray detect light and dark (direction, presence of large objects).

The all-men competition was coming up at Crawfish Aquatics. Every team that was in the competition practiced hard everyday in order to have a shot at winning. There was one team, in particular, who had been practicing very hard. As the date of the competition came closer, the team would practice twice a day making sure that they had all the skill that they needed to win. The team’s coach called for a final practice the day before the competition. When their coach, Louis, arrived at the last practice, he saw that none of his swimmers showed up. Louis had to think of a punishment to teach his team a lesson that they can not choose which practices they attend. After a long time of brainstorming of ideas, he finally came up with the perfect plan.

Cnidarians are characterized by specialized cells called cniodocytes, they are found mainly in the tentacles, or around the mouth of the polyp. These cells work as a defense or for the capture of prey as they can have a high toxicity. Cnidocytes have specialized organelles called nematocysts, which comprises a bulb-shape capsule containing a coiled hollow tubule structure attached to it. Next to it there is a very modified flag, the cnidocil that captures the stimuli that trigger the discharge. When the nematocyst is stimulated there is evagination of the filament that is embedded in the skin of the victim or predator and injects the

The nervous system of Anniyas is a complicated network of nerve cells interlaced with one another and specialized cells performing one of the most complex functions in the bodies of Anniya. The nervous system serves as a network of communication to many organs of the body, and it also functions as a control system to maintain homeostasis of the Anniyas’ bodies. It controls numerous body activities through stimuli, hormones, and other methods. As the internal and external environment change, the nervous system can send impulses to various parts of the body to respond to stimuli and maintain homeostasis. In Anatomy and Physiology by Tortora & Derrickson, it is mentioned that the nervous system is separated into two divisions: “The central nervous system (CNS) which comprises the brain and spinal cord, and peripheral nervous system (PNS), which is made up of ganglia, sensory receptors, and enteric plexus which, carry nerve impulses to and from the body” (400). The Anniyas’ peripheral nervous system is also divided into three systems:

Jellyfish do not have specialized osmoregulatory, respiratory, digestive or circulatory systems. They digest using the gastrovascular cavity; this is where nutrients are absorbed. Since their skin is thin the body is oxygenated by diffusion and eliminates the need for a respiratory system. Since Jellyfish are made of 90% water; most of their umbrella mass is gelatinous material. This jelly type material is called mesoglea; which is surrounded by two lawyers of epithelial calls. This forms the exumbrella, top surface, and the subunbrella, bottom surface, of the body. The jellyfish do not have brains but instead they are made up of a network of loose nerves known as nerve net. The nerve net is located in the epidermis. Jellyfish detect their stimuli by this nerve net. Once detected the nerve net sends impulses throughout both the nerve net and throughout the circular nerve ring located at the rim of the jellyfish’s body.