Female Darkblotched Rockfish: A Literature Review

Head and Keller (2015) hypothesized the reproductive biology of female darkblotched rockfish (Sebastes crameri), has changed its ovaries size, size of the fish and the age at when maturity may occur over a relatively short time period in response to changes in selective pressure, population density or overfishing. They choose to only do the female do to the knowledge that males had no effect on the growth of the population of the darkblotched rockfish. The female darkblotched rockfish were collected from mid-May to late of October 2011 and 2012. Northwest Fisheries Science Center’s (FSC) helped collect their own independent survey of the fish in U.S.-Canada to the U.S.-Mexico border at depths of 55 to 1280m. The female darkblotched rockfish

There were second age-readers who looked at the otolith annuli to get a correct and efficient age. Both the reader’s disparities were resolved and corrected. The National Marine Fisheries Service examined ovaries and age structures of the female darkblotched rockfish from a collected in 2011 and 2012 to see the oocyte development stage and maturity. The length and age were estimated to be 30 cm length and 6 years this showed a 12 and 29 % decrease to the length and age of at 50 % maturity previously reported back from 1986 to 1987. This tells us that a shift to lower age maturity may be predictable to increase the rebuilding rate of a population after the end of overfishing this is not always the case. Many of the young fish may see reduced fecundity, smaller eggs, shorter reproductive seasons, higher rates of skip spawning, and lower rates of offspring that will be able to survival compared to older larger females of the rockfish. This study exemplifies that fishers need to monitor the reproductive limitations of fish over time to help improve estimates number of fish that can be fished without hurting

Palumbi and Walsh et al. (2005) explain that the bigger fish are afraid of getting caught or eaten. Bigger fish don’t go out looking for as many meals as smaller fish do to their fear. Fish then realize that they need to mate with a smaller to have a better your chances are for survival. These articles I read both seem to corroborate that the bigger fish aren’t the best for mating disadvantage of being big fish. Do the amount a constant harvesting without giving the fish to reproduce more the fish themselves have started to mature faster. The fish have matured faster do the fact that they might not have the chance to reproduce so they want to mature as fast as possible to be able to pass down there genes. While the fish mature faster they are also getting harvested more and more rigorously so the studies show that the fish have to mature faster to be able to have a chance in passing their genes down to the next generation. I conclude that harvesting fish is not bad however unless we don’t live the fish’s a__ time to repopulate their species we will not have any fish to eat in the