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Li H.L.,Shanghai Ocean University | Li Y.D.,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources
Applied Mechanics and Materials | Year: 2013

Through summary of multiphase flow coupling, considerate the conservation of mass and momentum conservation, used the gas phase as a continuous phase, liquid phase and solid phase as dispersed phase, CFB has been simulated with the help of Eulerian model. It show that the local gas holdup increases from the computational domain inlet to the outlet, the local solid holdup decreases from the computational domain inlet to the outlet, and the local liquid holdup decreases from the computational domain inlet to the outlet. © (2013) Trans Tech Publications, Switzerland.

Zhang S.,Shanghai Ocean University | Zhang S.,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Zhu Z.,Shanghai Ocean University | Gao C.M.,Shanghai Ocean University
Advanced Materials Research | Year: 2014

According to the survey data of water quality from 2010 of fifteen monitoring sites which in the area of artificial reefs, one mass index of water quality evaluation method, comprehensive quality index method of Water quality and eutrophication level index method were used to analyze the water quality status in Haizhou Bay. The results shows that, each site BOD5, COD, DIN accord with standard of sea water quality class 1. DIP mostly belong to 2 class standard; In addition to four monitoring sites' water integrated quality in the slight pollution status for grade 3, the rest of the eleven regions of the sea water is relatively clean for grade 2; This sea water's N/P maintain the balance basically, In addition to a site appears eutrophication phenomenon, most are in low and medium nutrient level. © (2014) Trans Tech Publications, Switzerland.

Liu B.,Shanghai Ocean University | Liu B.,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Chen X.,Shanghai Ocean University | Chen X.,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Yi Q.,Shanghai Ocean University
Chinese Journal of Oceanology and Limnology | Year: 2013

Although many studies on the fishery biology of jumbo flying squid, Dosidicus gigas, have been conducted in the coastal areas within Exclusive Economic Zones (EEZs) of various countries due to its commercial and ecological importance, limited biological information is available from waters outside these EEZs. In this paper, we examined D. gigas fishery biology from waters outside Chilean, Peruvian and Costa Rican EEZs, based on the fishery data collected by Chinese jigging vessels during 2006 to 2010. The dominant mantle lengths of D. gigas were 350-450 mm, 250-400 mm and 250-350 mm outside Chilean, Peruvian and Costa Rican EEZs, respectively. Size structure analysis show that a medium-sized group existed mostly in the waters outside the Chilean and Peruvian EEZs, whereas a small-sized group occurred mainly in the waters outside the Costa Rican EEZ. The longevity of the squid outside the Costa Rican EEZ was less than 10 months, while most of those outside Chilean and Peruvian EEZs were about 1-1. 5 years and very few large individuals were 1. 5-2 years old. A higher percentage of mature individuals existed outside Costa Rican EEZ implying the region as a potential spawning ground, while lower proportions of mature squid outside the Peruvian and Chilean EEZs indicated that spawning may be occurring outside our study area. Spatial differences in sizes at maturity of the squid are thought to be result from different environmental factors especially different temperature and nutrition among the three areas. Stomach-content analysis showed that cannibalism was important in the diet of D. gigas. Stress generated by jigging may increase the incidence of cannibalism. © 2013 Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg.

Li Y.-K.,Shanghai Ocean University | Li Y.-K.,National Engineering Research Center for Oceanic Fisheries | Li Y.-K.,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Gong Y.,Shanghai Ocean University | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2014

Cephalopods play an important role in marine food webs, however, knowledge about their complex life history, especially their feeding ecology, remains limited. With the rapidly increasing use of stable isotope analysis (SIA) in ecology, it becomes a powerful tool and complement of traditional methods for investigating the trophic ecology and migration patterns of invertebrates. Here, after summarizing the current methods for trophic ecology investigation of cephalopods, applications of SIA in studying the trophic ecology of cephalopods were reviewed, including the key issues such as standardization of available tissues for SIA analyzing, diet shift and migration patterns of cephalopods, with the aim of advancing its application in the biology of cephalopods in the future.

Chen X.,Shanghai Ocean University | Chen X.,Key Laboratory of Shanghai Education Commission | Chen X.,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources | Cao J.,Shanghai Ocean University | And 7 more authors.
Bulletin of Marine Science | Year: 2012

As a dominant current in the northwest Pacific Ocean, the Kuroshio influences the population dynamics and species distributions in this region. Using catch per fishing day (CPU E, t/d) of the red flying squid Ommastrephes bartramii (LeSueur, 1821) from the Chinese mainland squid jigging fleets on the feeding ground (150°E-165°E, 38°N-46°N) from August to October of 1998-2007, we calculated the monthly latitudinal center of gravity of CPU E (LATG j) and analyzed the relationship between the strength and position of the Kuroshio and the spatial distribution of O. bartramii. The LATG j for this species differed significantly from month to month. Regression modeling of the LATG vs Kuroshio transport also revealed a significant influence of Kuroshio strength on the north-south movement of O. bartramii. We suggest that the varying strength of the Kuroshio leads to changes in environmental conditions at 150°E-155°E, 40°N-43°N. The environmental variable most significantly correlated with LATG j was sea surface temperature, suggesting that the distribution of O. bartramii is controlled by optimal thermal habitat. We conclude that the spatial distribution of O. bartramii on their feeding grounds from August to October can be forecast using the path and transport of the Kuroshio. © 2012 Rosenstiel School of Marine and Atmospheric Science.

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