Comparative Study Of Using 17 Β -methyltestosterone And Some Medicine Plants As Reproductive Controller Agents Of Oreochromis Niloticus

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.

Temperature had a direct effect on oxygen consumption of crayfish, Orconectes propinquus. Crayfish acclimated to warm temperature (20 to 25 C) had a mean mass of 8.25g +/- 1.05. Crayfish acclimated to cold temperature (3 to 5 C) had a mean mass of 10.61g +/- 0.77. Oxygen consumption rates of 30-60 minute treatments were used and there was no significant difference between the two different treatments (t=0.48, df=58, P=0.70). The data from 0-30 minutes were not used because the crayfish were disrupted by transportation and the data were not normally distributed. The Q10 value was 1.05, representing that there was full compensation for oxygen consumption for the crayfish at two different acclimated temperatures. The oxygen consumption of crayfish was not affected significantly by two different temperatures (Figure 1).

The purpose of the study was to detect the rates of hyphal tip growth and nuclei position of N. crassa in influence of drug medium, Taxol. The results of the experiments show that the rate of hyphal tip growth and nuclei position are much lower in drug medium than in the control. Taxol have different effect on growth of tip and distance travelled by nuclei. Moreover, the rate at which the nuclei displace and growth of the tips are dependent on the medium and not on each other. Thus, the results conclude that drug effected fungus affects the tip growth rate and nuclei displacement.

The development of A. salina will be unfavorable if exposed to too much ethyl alcohol. Treatment two and three have more ethanol alcohol than treatment one and more brine shrimp died when put into more ethanol alcohol. Since the viability was less than the viability in treatment one, the hypothesis was supported. Treatment four was the constant and had no ethanol alcohol which less cysts died when compared to treatment two and three, but when compared to treatment one, more had died,

Boats are very common on the lake, both for fishing and recreation. The lake is a popular to anglers looking for kokanee salmon (Oncorhynchus nerka) and lake trout (Salvelinus namaycush). Other fish like rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta) are also abundant in the lake. Mysis shrimp were introduced into the lake many years ago. They have had an impact on the kokanee salmon and will be analyzed in the final paper. The fishing industry provides income for the area, as well as jobs. As of recent, the populations of kokanee salmon and lake trout have been in a decline. The interaction of human management on these fish populations is needed in order to help increase these fish abundance in the lake. This issue is also linked to the management of water in the lake because water levels impact the way that fish species

The purpose of this experiment is to perform a procedure known as SDS-PAGE (sodium dodecyl sulfate - polyacrylamide gel electrophoresis) in order to determine protein profiles for seven fish species: Yellow Tuna (Thunnus albacares), Thresher Shark (Alopias vulpinus), Paiche (Arapaima gigas), Swordfish (Xiphias gladius), Catfish (Ameiurus catus), Coho Salmon (Oncorhynchus kisutch), and Rainbow Trout (Oncorhynchus mykiss). The gel electrophoresis separates the fish muscle proteins according to their molecular weights, which allows one to determine a profile for each specie.

This article discusses the role of GnRH in the development of cinnamon clownfish. GnRH play a significant role in the reproduction and sex change . fish have five different types of GnRH genes with different peptides that are structurally different, and therefore functionally different, because of their varying beta structure. Using varying transcriptors and rapid amplification the researches found the specific GnRH gene in clownfish. The mRNA was measured, along with plasma estradiol levels in the immature fish. GnRH, GTH, and other neurohormones act together simultaneously to regulate production in the clownfish,

This expermetal test chemoreception of channal catfish detection of crayfish and sculpins extracts. Channel catfish olfactory organs and taste buds barbels was tested to absorb the response time to crayfishh and sculpin extracts. The research groups included amputated barbels catfish (BarbX), plugged nares catfish(Olfplug) and fish that went through the procedure but did not receive the cuts of the plugs (BarbSh or OlfSh). The catfish was able to sense crayfish extract under different condition, but they did not spend as much time in a Y-maze arm with scuplin extract. This could be the result of amino acids that scuplin releases. Therefore, concentration (nM) of nine amino acids in crayfish and scuplin was measured using high performance liquid chromatography

This paper observes the efficiencies of three different feed types fed to Epinephelus coioides. These feed types include a soy-based plant protein pellet (AQUA-LIFE), fish meal pellets (Ridley Aqua Feeds) and whole Pilchards. The fish had their dry weight and length measured prior to the commencement of the trial. 12 tanks, with 5 fish per tank were fed the three different feed types. All fish were fed every day of the 5 week trial period. The results showed the fish meal pellets had the most efficient food conversion ratio (FCR) value (0.84), with a standard growth rate (SGR) of 4.28 grams per week. This FCR value was substantially more efficient compared to the value of 2.20 and 2.98 for the Pilchards and plant based protein respectively. Several mortalities occurred in the fish being fed plant based protein, possibly due to high aggression as a result of a lack of nutrients. Water quality parameters were also not ideal for the growth of the fish as all nitrogen levels were above the ideal threshold, with nitrate reaching 89 ppm before a water change was conducted. In conclusion, the fish meal pellets proved to be the most

According to a study done by Living Planet Report in 2015, 29% of the world’s fishing stocks are considered overfished and an additional 61% is fully exploited with no possibility to produce more fish. Our environment is currently afflicted by a number of different problems, one of which is overfishing. Overfishing is defined by FishOnline as, “Fishing with a sufficiently high intensity to reduce the breeding stock levels to such an extent that they will no longer support a sufficient quantity of fish for sport or commercial harvest.” The overfishing situation is being exacerbated by non-sustainable and destructive fishing practices and unfair fisheries partnership agreements; while there are currently attempts being made at fixing these problems and their effects on overfishing, nothing has been extremely effective.

Most of these beginning mariculture attempts had little success. At the time, adult animals were quite easy to obtain but getting them to reproduce was almost impossible. Collecting the sperm or eggs from the abalone killed the adults and did not produce any fertile offspring. A female abalone can release millions of eggs and a male can release trillions of sperm during spawning periods. If their external fertilization could be controlled, it would only take one female and one male to create millions of zygotes. But at the time there was not enough biological research for successful mariculture and the accidental introduction of parasitic worms and diseases to captive abalone caused several setbacks to the process. After discovering that hydrogen peroxide induces spawning, abalone farms became fully-functioning in the eighties. Numerous farms are still producing and selling maricultured abalone to markets and restaurants in southern California ("Abalone History and Future").

First, select the right ingredients at the right store. Select the right store to buy the tilapia fish and look for the fish’s appearance. The store should be hygienic. If the fish is in a place where it is dirty or the fish is with melted ice, that store may not care much about freshness and newness. Touch and squeeze the skin of the fish, if the skin does not bounce back is a signal of an old fish. It is important to smell the tilapia; the fish must not have a fishy or sour smell. The eyes should be cloudless and bright. Avoid those with gray or cloudy looking eyes. When choosing the rest with the ingredients make sure they are fresh and natural.

Another global effect of overfishing is fish farming or aquaculture. It was first started to help preserve the ocean and hoped to help people to obtain a reliable fish source. Unfortunately, what many came to realize is the downside of fish farming. One example is water contamination, where consequently waste products such as foods eaten, feces and other dead fish, are all dumped into our main water supply which contributes to water pollution. Moreover, chemicals that are used to treat the fish farms like antibiotics and algaecides are all released into the ocean; which is a real cause for concern for our oceans. Fish that come from the fish farms are pumped full of drugs, to prevent sickness in the fish but this is not healthy for us to eat. There is also a great environmental impact which includes the fact that to sustain fish farms, portions of

Pollution is a damaging with fish farming. A group of wild fishing being fed to fish in the ocean will eventually transfer disease. As well, fish pollute the water from their wastes. Fish farming also affects the growth and genetics of the fish because they are not in a wild environment. More research should be completed to provide more adequate information and prevent negative outcomes for fish farming.

Aquaculture management entails the making of management decisions such as what, where, when and how to produce, in addition to the execution of such decisions (Jhingran, 1987). In China and Socialist countries of Europe which account for a high proportion of present day aquaculture production of the world, fish culture are prepared in state farms, communes or through