Ringed Crayfish Data Analysis

- To test this hypothesis my experimental approach would be testing different bodies of water or testing one and just testing different areas while tracking the fish.

There were 3 different groups of the critters. If they were in the 1st group the water wasnt polluted, if they were in the second group the water was somewhat polluted, and if they were in the 3rd group, the water would be polluted. We found more critters living in group 1. In the graph it shows that we found 88% of the critters in group 1 are living in the water. The critters we found in group 1 were the gilled snails, water pennies, and the mayflies. It also shows that in group 2, only about 2% of the critters living in the water. The insect we found in group 2 was the crayfish. Than, in group 3, it shows that 10.7% of critters are living in the water. The critters found in group 3 were the dragonflies, worms, and the pouched

Over 25 years ago, a new species was discovered that completely shocked the world, a crayfish-like no other, named the marbled crayfish.As their name suggests, they include an alluring brown colored marbled pattern, which is identical from individual to individual. To this day, the marbled crayfish is more diverse than any other crayfish because it is able to clone itself without any involvement of a male, in a matter of hours. This crayfish is new mutant species which has generated immense concern as a potential invasive species. What really shocks the scientists is the fact that they can reproduce at extraordinary rates from 250 to 300 clones in a few months and are already spreading rapidly throughout the globe. This creature was never

For both treatments, the number of Daphnia consumed during the 0-5minute interval is more than the amount of Daphnia consumed in the last 25-30 minute interval (Figure 1). The null hypothesis expects Guppy (Poecilia reticulate) to feed equally in the absence and in the presence of the plastic aquatic plant, therefore any deviance between the means of the two treatments is due to chance; the null hypothesis is rejected, the mean total number of Daphnia consumed in the presence of the plant (4.2) is significantly different from the mean total number of Daphnia consumed in the absence of the plant (14.2) (Two-sample t-test, t=3.28, df=8,

In a catch-recapture study, several assumptions must be made to achieve the greatest accuracy. First, during the interval between the initial marking period and the following recapture

Identify certain regions of the crayfish body: the head, thorax (combined with the head), and abdomen. Look at Figure 2 to understand where to look.

Cetacean bycatch in fishing industries has been a highly debated topic for decades and is still considered an ongoing problem(NOAA 8). However, when it is looked at in comparison, the problem of bycatch has already been solved as much as is possible while still allowing fishing industries to fish at all. Bycatch is defined as any marine life that is caught and returned to the sea, whether it is dead or alive(Brooke 2). Therefore, many marine animals that are considered bycatch are not harmed in any way. Including these animals, the national bycatch ratio is still low(Brooke 3). Many actions have already been taken since this has become an issue that has reduced bycatch by an incredibly large amount. In many areas, the amount of bycatch compared to the amount of fish that the fisheries in that area take in is only a small fraction(Brooke 3). There will always be bycatch in fishing, even if a single fisherman is fishing with a single

The hypothesis was that the plastic bags would affect the crayfish the most. There was 3 crayfish in each of the 4 tanks. Each tank was given the same amount of 1 the 3 plastics.

However, there is a growing number of fish harvested for domestic consumption (Cooke, 2007). With the motivations of fishing differing, the management of trout are considered when thinking of the quality of life. Considering the fish size, the number of fish caught and the number of attempts; “strikes” as well as the fishing environment can enable the fish population and the sport of angling a happy balance. Thus, the estimates of mortality from catch-and-release are now tied into fishery management. Scientist are discovering that other environmental factors are posing more of a danger to fish than fisherman. For example, the movement of a male fish to a nest can result in “nest abandonment” which can result in the loss of reproduction for individual fish. With the management of catch-and-release, nest abandonment is less likely to

In the southeast coastal zones the urban development is about 4 times the average development around the nation (NMFS, 2009). The main locations that companies want to build on are wetlands (SAFMC, 1998). Construction does not only fill in the wetlands but it also is a source of toxins in the environment, causes eutrophication and modifies the water quality parameters (NMFS, 2009). With urbanization, seawalls and canal were constructed to protect the new buildings (SAFMC, 1998). The seawalls and canal construction mostly replace mangrove shorelines and shallow estuarine waters, which is the exact habitat specifications of the smalltooth sawfish (NMFS, 2009). One example of urbanization is the Indian River Lagoon in Florida (Gilmore, 1995). The species population in the Indian River Lagoon used to be abundant but now after all the construction in the area, the sawfish populations have disappeared (Gilmore, 1995). By taking away the critical habitats of the smalltooth sawfish, the populations dramatically declined to a point of almost going

One person was the designated measurer, one person would capture the mosquito while, and the last person would be in charge of recoding the data and observations made. The group then headed over to Hennington Pond on the Modesto Maidique Campus (MMC) of Florida International University (FIU) in order to proceed with the sampling. After a quick survey of the surrounding, the group was able to identify an optimal location to capture the mosquitofish. Multiple captures were conducted with a large net in. As each round of captures were conducted, the fish were then taken from the net and measured with a ruler in order to find out how big the fish was, in millimeters. Any fish that measured less than 9mm would not be counted as one of the fifty fish needed for the sampling. After 50 measurements of fish, the field portion of the experiment was concluded. Materials were then returned to their proper location and the research was continued. To find the age of the fish, the following formula was used:

The spread and continued reproduction of the Northern Snakehead in the Potomac river has been and will continue to be a threat to the integrity of the local ecosystem. The Northern Snakehead is causing a disturbance in the local ecosystem. These fish need to either be removed from the ecosystem or their spread halted. Since their discovery in Crofton, Maryland, drastic measures have been taken in the past to rapidly eradicate this species regardless of lasting effects. Most of the previous solutions include dumping large quantities of poison, draining bodies of water, and encouraging fishing. In many cases this has caused bodies of water to be unuseable for extended periods of time. It is for these reasons we would like

The smalltooth sawfish became the first marine fish in the U.S. to receive federal protection as an endangered species. All of the seven species of sawfish are on the World Conservation Union’s (IUCN) Red List of Threatened Species. The main cause of the decline in the number of sawfish is due to the entanglement in commercial fishing nets that are found in the ocean. Their toothy rostrum causes extensive net damage. Therefore, many fisherman have regarded these fishes as an inconvenience. As a result, many of the sawfish caught in nets were killed, or too harmed from the incident to survive once set free. Another factor to the loss of the smalltooth sawfish is the loss of mangrove forests and other nursery habitats for conversion to any beachfront development in the southeast, which is extremely important for the smalltooth

Australian freshwater crayfish, Cherax cainii is an important cultured species in Western Australia. As a part of fast growing aquaculture activity, future aquaculture of this species will be also affected by the limited supply of fishmeal (Olsen and Hasan 2012). Fishmeal has been used as protein source mainly in aquaculture, poultry feed, and pig (Tacon and Metian 2009). Fishmeal has very complex amino acids characteristic which is required by the fish to grow (Wilson and Halver 1986). Lack of amino acids in the feed lead to health problems in cultured fishes (Kloppel and Post 1975, Poston and Rumsey 1983, Halver and Shanks 1960). However, the increasing trends of fishmeal utilization in last two decades (Tacon and Metian 2009) combine with the stagnation of wild caught fisheries (FAO 2014) become a major pressure on the fishmeal supply. Thereof an alternatives fishmeal substitute is required to

4Second Year, Undergraduate Student, Fisheries College and Research Institute, Tamil Nadu Fisheries University, Thoothukudi, Tamil Nadu, 628008, India.