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Lu H.-J.,National Engineering Research Center for Oceanic Fisheries | Lu H.-J.,Shanghai Ocean University | Chen X.-J.,National Engineering Research Center for Oceanic Fisheries | Chen X.-J.,Shanghai Ocean University | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2013

Bayesian Schaefer model was applied to assess the stock of Illex argentinus in the South-west Atlantic Ocean, with the risk of alternative management strategies for the squid analyzed. Un-der the scenarios of normal and uniform prior assumptions, the estimated model parameters and reference points were similar, and higher than the values under the scenario of logarithmic normal pri-or assumption. Under the three proposed scenarios, the fishing mortalities and the total catches in 2001-2010 were lower than the reference point F0.1 and the maximum sustainable yield (MSY), indicating that the I. argentinus was in an expected sustainable exploited level but not in over-fishing and over-fished. The results of decision analysis indicated that at the same harvest rate, the stock of the I. argentinus under the scenario of logarithmic normal prior assumption in 2025 would be the lowest, and the probability of collapse would be the highest. Under the three scenarios, the harvest rate in 2025 would be all 0.6 if the catch was the maximum. However, if the harvest rate was set to 0.6, the stock of the I. argentinus after 2025 would have definite risk, and thus, the harvest rate 0.4 and the catch 550000 t appeared to be the best management regulation or the base-line case.


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.


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.


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.


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.


Dai X.,Shanghai Ocean University | Dai X.,National Engineering Research Center for Oceanic Fisheries | Li W.,Shanghai Ocean University | Tian S.,Shanghai Ocean University | Tian S.,National Engineering Research Center for Oceanic Fisheries
Mitochondrial DNA | Year: 2015

Hemiculter bleekeri bleekeri is a typical freshwater species that are mainly distributed in the river basins in China. The biological information of this species is very limited. In this study, we determined the complete mitogenome sequence of H. bleekeri bleekeri. The complete mitogenome of H. bleekeri bleekeri is 16 6173 bp in length, which contains 22 transfer RNAs, 2 ribosomal RNAs, 13 protein-coding genes and 2 non-coding region, a rep region (33 bp) and a control region (D-loop). This work provides new information which is helpful for comprehending the molecular systematic, taxonomic status and evolutionary biology of this species. © 2015 Taylor & Francis


Lu H.J.,Shanghai Ocean University | Lu H.J.,National Engineering Research Center for Oceanic Fisheries | Chen X.J.,Shanghai Ocean University | Chen X.J.,National Engineering Research Center for Oceanic Fisheries | Fang Z.,Shanghai Ocean University
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2015

The shortfin squid, Illex argentinus, is a neritic-oceanic species distributed along the continental shelf and slope waters of Uruguay, Argentina and the Falkland Islands in the Southwestern Atlantic Ocean between latitudes 20°S and 55° S. They occur more abundantly in the area of 35°—52°S,which supports an important jigging fishery on the Patagonian shelf and plays a significant role in the regional ecosystem. I. argentinus is an opportunistic species having rapid growth, a short life cycle, opportunistic feeding, and a high degree of intrapopulation differentiation. Statoliths of cephalopods are small calcareous structures with high resistance to erosion and recording important information all through its life. It is usually used for estimating ages and growth, identifying population structures by analyzing their microstructure, deducing possible migratory routes and reconstructing habitat environment of cephalopods by the analysis of trace elements and isotopes in statolith. Illex argentinus supports an important commercial fishery in the southwest Atlantic. Understanding of population structure, migration and early life history are essential in sustainable exploitation and management of this squid. Elements of 33 statoliths of I. argentines collected in the Southwest Atlantic Ocean during 2007, 2008 and 2010 by Chinese squid jig fishing fleets were analyzed with Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) for different hatching groups, sexes and life history stages. The results indicated that the statolith of I. argentinus contained 56 elements, and calcium (Ca), strontium (Sr), sodium (Na), phosphorus (P), potassium (K), iron (Fe), magnesium (Mg), barium (Ba), boron (B), gallium (Ga) were the ten most abundant elements. The analysis of variance (ANOVA) showed that there was no significant difference in all element distributions between sexes (P>0.05); however, significant difference existed in the Sr, Na, Mg, Ba, B (P<0.05) and no significant difference was found in the Ca, P, K, Fe and Ga between different hatching groups (P>0.05). Significant difference existed in all of the ten most abundant elements except for Na, Ba and Ga among different growth zones including nuclear part, postnuclear part, dark zone and peripheral zone in statolith (P<0.05). This study suggested that Sr and Mg were the best two trace elements to be used in the study of the population structure and life history of I. argentines. © 2015, Science Press. All rights reserved.


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.


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.


PubMed | National Engineering Research Center for Oceanic Fisheries
Type: Journal Article | Journal: Ying yong sheng tai xue bao = The journal of applied ecology | Year: 2013

Abstract: Bayesian Schaefer model was applied to assess the stock of Illex argentinus in the Southwest Atlantic Ocean, with the risk of alternative management strategies for the squid analyzed. Under the scenarios of normal and uniform prior assumptions, the estimated model parameters and reference points were similar, and higher than the values under the scenario of logarithmic normal prior assumption. Under the three proposed scenarios, the fishing mortalities and the total catches in 2001-2010 were lower than the reference point F0.1 and the maximum sustainable yield (MSY), indicating that the I. argentinus was in an expected sustainable exploited level but not in over-fishing and over-fished. The results of decision analysis indicated that at the same harvest rate, the stock of the I. argentinus under the scenario of logarithmic normal prior assumption in 2025 would be the lowest, and the probability of collapse would be the highest. Under the three scenarios, the harvest rate in 2025 would be all 0.6 if the catch was the maximum. However, if the harvest rate was set to 0.6, the stock of the I. argentinus after 2025 would have definite risk, and thus, the harvest rate 0.4 and the catch 550000 t appeared to be the best management regulation or the baseline case.

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