CHAPTER 2 LITERATURE REVIEW 2.1. The larval fish stages Fish larvae are part of the fauna that eat smaller organisms. According to Leis and Ewart, (2000) they characterize larval stage to end with the fulfillment of full outside quantitative feature characters, the entry of any mobile structure. For the larval stage according to Termvidchakorn and Hortle, (2013) the larval stage can be divided into three which are yolk sac stage, pre-larval stage and post larval stage; whereas according to Leis and Ewart, (2000) the larval stage is divided into segment that outlined by formation of the caudal fin and flexion on the notochord. Ahlstrom and Ball, (1954) stated that the terminologies of the development stage of larval fish divided into yolk
Usually, they spawn in large groups where they become highly vulnerable to commercial fishing. The estimated relative batch fecundity is more than 90 eggs/g of female’s body weight. Bluefin tuna Aquaculture: The farming of Atlantic bluefin tuna began as early as the 1970s by Canadian fishermen who captured young fish and raised them in pens. The development of tuna farming continued in order to meet the growing demand for tuna in Japanese market. Cages are used for tuna fattening with the target to grow tuna to reach hundreds of kilos, which fetch premium prices in Japan.
a one day, Rara told to find fish for dinner. after searching for hours on end Rara got goldfish and immediately take home goldfish . when he got home goldfish in put in a bucket of water and then he cooked rice. Suddenly, Rara heard someone ask for help. “ Help..... help...”.
a. Count the number of dead brine shrimp instead of living brine shrimp b. Add more brine shrimp to the water with the highest salt concentration c. Repeat the experiment several times, and calculate the average number of brine shrimp d. Reduce the length of the experiment from 24 hours to 8 hours. 23. Where is the information stored in DNA?
Some sponges reach their sexual maturity when only a few weeks old, while several years will be required for other species. During spawning, sperm burst out of their cysts and released into the water and once they find another sponge of the same species, sperm are carried by water flow to the female apparatus that engulf them where fertilization occurs internally. Most sponge species retain the eggs until they hatch into planktonic larvae that float around in the water for few days with the help of its cilia. Afterwards, the swimming larvae find a place where they settle and start growing into a miniature adult
While juvenile abalone grazes for algae, diatoms and bacterial films, adults rely on drift algae, and if food becomes scares, they move after their food. Under farming conditions where most of abalones are produced, the macroalgae are the main abalone feed.However, many abalone farms use successfully high quality manufactured feed which has been found healthy and efficient in the production of high-quality
The back flippers is like a paddle shape. Its ridged carapace and their large flippers do make the leatherback turtle is uniquely equipped or prepared for long distance hunting for food. The Female leatherbacks took 2-3 years to re - migrate to their nesting sites. The females nest around several times within a nesting season, during the nesting season usually after 8-12 day intervals they lay approximately 100 eggs. After around 2 months, the leatherback hatchlings come out or emerge from the nest and have a white striping along the ridges on the back and also on the margins of the
When hermit crabs have outgrown their shell, they shed it and look for a new one. Sometimes they will go bare before they find their new home. Those months between my depart from Jamaica and the prefect pinning ceremony, I had been bare, looking for a shell which fit me and one that I would be proud to carry. My channeled whelk is tinted with champagne and beige, smooth in texture and perfected with fibonacci. I am a hermit crab - I mature, I change, I
In the year 1974 aquaculture became commercial. For breeding purpose a pond was built in Bique especially for prawns. This development quickly expanded likewise because of presenting Whiteleg Shrimp homesteads and incubation facilities. The main lakes were contructed in Veraguas region, trailed by a 34 hectare ranch in Aguadulce and an incubation facility for bringing post hatchlings up in the town of Veracruz. In the year 1995 a law was released which stated aquaculture as farming.