Entity

Time filter

Source Type


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

With the rapidly increasing use of stable isotope analysis (SIA) in ecology, it becomes a powerful tool and complement to traditional methods for investigating the trophic ecology of animals. Sharks play a keystone role in marine food webs as the apex predators and are recently becoming the frontier topic of food web studies and marine conservation because of their unique characteristics of evolution. Recently, SIA has recently been applied to trophic ecology studies of shark species. Here, we reviewed the current applications of SIA in shark species, focusing on available tissues for analyzing, standardized analytical approaches, diet-tissue discrimination factors, diet shift investigation, migration patterns predictions and niche-width analyses, with the aim of getting better understanding of stable-isotope dynamics in shark biology and ecology research.


Liu Z.-J.,Shanghai Ocean University | Zhu G.-P.,Shanghai Ocean University | Zhu G.-P.,National Engineering Research Center for Oceanic Fisheries | Zhu G.-P.,Collaborative Innovation Center for National Distant Water Fisheries
Chinese Journal of Ecology | Year: 2015

Antarctic icefish plays a significant role in the matter cycle and energy flow for Antarctic ecosystem. As a “white blood” fish, its scientific significance and commercial value has been concerned worldwide, but there exist many uncertainties in studies on age and growth of Antarctic icefish. Therefore, the present paper reviewed the research progress of age and growth of Antarctic icefish over the past 50 years, and summarized its classification and general geographical distribution in the Antarctic waters. Based on summarizing the basic methods on age and growth of Antarctic icefish, including length frequency analysis and analysis on calcified structures, this paper put the emphases on processing and estimating the otolith of Antarctic icefish species, and summarized age estimation, morphological feature and microstructure of otolith though pre-processing (direct observation, burning, and sectioning and polishing) of otolith and ring identification on sectioned otolith. Through summarizing the problems and deficiencies, such as the processing of juveniles ' otolith and forming time of first ring, on age and growth estimation of Antarctic icefish species, future research directions were prospected. © 2015, editorial Board of Chinese Journal of Ecology. All rights reserved.


Zhou C.,Shanghai Ocean University | Xu L.,Shanghai Ocean University | Xu L.,National Engineering Research Center for Oceanic Fisheries | Xu L.,Shanghai Collaborative Innovation Center for Oceanic Fisheries | And 2 more authors.
Fisheries Research | Year: 2015

Vessel position and shooting direction relative to current direction can potentially affect the movement and spatial geometry of purse seine during fishing operations. This study developed an image measurement algorithm to obtain kinetic transformation of a model net when setting in different patterns (shooting with current, front set in shorthand: shooting against current, back set; and shooting lateral to current, cross set) in a specialized purse seine test tank. The results showed some differences in the pattern of deformation in the leadline and floatline. Front set produced the greatest encircled volume by minimizing the area contraction with the open area for floatline in real operation of 0.259km2 in cross set, 0.266km2 in front set, and 0.257km2 in back set, respectively. Different sinking curves were observed in the vertical configuration of middle part of leadline among shooting patterns. Back set is considered as the optimal strategy of setting the net judged from the sinking behavior, as it provides the greatest sinking depth in the middle part of the net. The seiner moved the greatest distance downstream in back set, while the greatest drifting distance inward the circle occurred in front set where it is likely to lead to the seiner drifting over the net. Purse line tension increased continuously until the conclusion of pursing and the bunt was subjected to greater tension force than that at the wing end. © 2015 Elsevier B.V.


Zhou C.,Shanghai Ocean University | Xu L.,Shanghai Ocean University | Xu L.,National Engineering Research Center for Oceanic Fisheries | Xu L.,Shanghai Collaborative Innovation Center for Oceanic Fisheries | And 2 more authors.
Ocean Engineering | Year: 2015

Nylon fiber is the dominant material for net panels in purse seine tackle. Nets of a knotless nylon weave called "Ultra Cross" benefit from higher strength and attrition-resistant properties over conventional twisted netting. This study reports the hydrodynamic characteristics of knotless nylon netting with various solidity ratio in their normal, parallel, and angle of incline to free stream. Normal drag coefficient is considered to be dependent on the cooperative domination of Reynolds number (Re) and solidity ratio. Net solidity has a positive effect on the normal coefficient, while it is contrary in the dependence of the drag coefficient of net panel parallel to flow on the solidity. A dual effect of solidity on drag coefficient for inclined nets was observed, which is described as a positive correlation in upper attack angle and a negative correlation in lower angle of attack. The drag coefficients at different angles of attack can be expressed by incorporating both normal coefficient and coefficient in parallel orientation. © 2015 Elsevier Ltd.


Zhu G.-P.,Shanghai Ocean University | Zhu G.-P.,National Engineering Research Center for Oceanic Fisheries | Zhu G.-P.,Collaborative Innovation Center for National Distant Water Fisheries
Chinese Journal of Ecology | Year: 2014

Based on the data provided by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) and the relevant information on the trophic level of selected fish species from Fishbase (www. fishbase. org), this paper analyzed the temporal fluctuation on the mean trophic level (TLi) of the finfish fishery in the Southern Ocean from 1970 to 2009. The results indicated that two stages were observed in the TLi of the finfish fishery in the Southern Ocean, i. e., the TLi had a decreasing trend with a lower level (3. 23-3. 60) from 1970 to 1991; however, the TLi (3. 82-4. 02) were at a higher level from 1992 to 2009. The mean asymptotic length of catch had a similar trend to the mean trophic level. The fishing-in-balance (FiB) index was the highest in 1970 and maintained at a stable level after 1997. © 2014, Editorial Board of Chinese Journal of Ecology. All rights reserved.

Discover hidden collaborations