Age, maturation and population structure of the Humboldt squid Dosidicus gigas were studied based on random sampling of the Chinese jigging fishery off the Peruvian Exclusive Economic Zones （EEZ） during 2008-2010. E...Age, maturation and population structure of the Humboldt squid Dosidicus gigas were studied based on random sampling of the Chinese jigging fishery off the Peruvian Exclusive Economic Zones （EEZ） during 2008-2010. Estimated ages ranged from 144 to 633 days, confirming that the squid is a short-lived species with longevity no longer than 2 years. Occurrence of mature females and hatching in each month indicated that Humboldt squid spawned year-round. Back-calculated hatching dates for the samples were from January 22^nd, 2008 to April 22nd, 2010 with a peak between January and March. Two size-based and two hatching date-based populations could be defined from mantle length （ML） at maturity and back-calculated hatching dates, respectively. Females matured at a larger size than males, and there was a significant difference in ML at maturity between the two hatching groups （P〈0.05）. The waters adjacent to 1 l^S off the Peruvian EEZ may be a potential spawning ground. This study shows the complexity of the population structure and large variability in key life history parameters in the Humboldt squid off the Peruvian EEZ, which should be considered in the assessment and management of this important resource.展开更多
We applied solution-based ICP-MS method to quantify the trace-elemental signatures in statoliths of jumbo flying squid, Dosidius gigas, which were collected from the waters off northern and central Chile during the sc...We applied solution-based ICP-MS method to quantify the trace-elemental signatures in statoliths of jumbo flying squid, Dosidius gigas, which were collected from the waters off northern and central Chile during the scientific surveys carried out by Chinese squid jigging vessels in 2007 and 2008. The age and spawning date of the squid were back-calculated based on daily increments in statoliths. Eight elemental ratios(Sr/Ca, Ba/Ca, Mg/Ca, Mn/Ca, Na/Ca, Fe/Ca, Cu/Ca and Zn/Ca) were analyzed. It was found that Sr is the second most abundant element next to Ca, followed by Na, Fe, Mg, Zn, Cu, Ba and Mn. There was no significant relationship between element/Ca and sea surface temperature(SST) and sea surface salinity(SSS), although weak negative or positive tendency was found. MANOVA analysis showed that multivariate elemental signatures did not differ among the cohorts spawned in spring, autumn and winter, and no significant difference was found between the northern and central sampling locations. Classification results showed that all individuals of each spawned cohorts were correctly classified. This study demonstrates that the elemental signatures in D. gigas statoliths are potentially a useful tool to improve our understanding of its population structure and habitat environment.展开更多
Issues concerning on the continental shelf and in the exclusive economic zone between Turkey and the Greek Cypriot Administration (GCA) have been more controversial. This study answers the following questions:(a) What...Issues concerning on the continental shelf and in the exclusive economic zone between Turkey and the Greek Cypriot Administration (GCA) have been more controversial. This study answers the following questions:(a) What is the main arguments of the Parties?(b) How the exclusive economic zone could be declared?(c) Does median line applicable to the delimitation law without taken the related circumstances in the Eastern Mediterranean?(d) Can any maps on claimed exclusive economic zone borders publish without maritime boundary delimitation agreements, officially? The main intent of the study is to evaluate the different perspectives of the Parties on maritime delimitation and to evaluate the boundaries of the exclusive economic zone bounded by the European Union on the European Asia and Europe Africa Interconnected Cable Network Projects maps in the Eastern Mediterranean.展开更多
According to the concept of the Exclusive Economic Zone(EEZ) set out in the United Nations Convention on the Law of the Sea,the "Maritime Frontier"of China can be defined as extending 200 nautical miles from...According to the concept of the Exclusive Economic Zone(EEZ) set out in the United Nations Convention on the Law of the Sea,the "Maritime Frontier"of China can be defined as extending 200 nautical miles from its coastal baseline.According to the UN principles展开更多
基金Supported by the National Natural Science Foundation of China (No.41276156)the National High Technology Research and Development Program of China (863 Program) (No. 2012AA092303)+3 种基金the Innovation Program of Shanghai Municipal Education Commission (No. 13YZ091)Shanghai Leading Academic Disciplin Projectsupported by National Distant-Water Fisheries Engineering Research Center, and Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of AgricultureYong Chen’s involvement in the project was supported by the Shanghai Dongfang Scholar Program
文摘Age, maturation and population structure of the Humboldt squid Dosidicus gigas were studied based on random sampling of the Chinese jigging fishery off the Peruvian Exclusive Economic Zones （EEZ） during 2008-2010. Estimated ages ranged from 144 to 633 days, confirming that the squid is a short-lived species with longevity no longer than 2 years. Occurrence of mature females and hatching in each month indicated that Humboldt squid spawned year-round. Back-calculated hatching dates for the samples were from January 22^nd, 2008 to April 22nd, 2010 with a peak between January and March. Two size-based and two hatching date-based populations could be defined from mantle length （ML） at maturity and back-calculated hatching dates, respectively. Females matured at a larger size than males, and there was a significant difference in ML at maturity between the two hatching groups （P〈0.05）. The waters adjacent to 1 l^S off the Peruvian EEZ may be a potential spawning ground. This study shows the complexity of the population structure and large variability in key life history parameters in the Humboldt squid off the Peruvian EEZ, which should be considered in the assessment and management of this important resource.
基金funded by the National Natural Science Foundation of China(Nos.41306127 and 41276156)National Science Foundation of Shanghai(13ZR1419 700)+3 种基金the innovation Program of Shanghai Municipal Education Commission(13YE091)Research Fund for the Doctoral Program of Higher Education of China(20133104120001)Shanghai Universities First-class Disciplines Project(Fisheries)supported by Shanghai Oversea Teaching Scholar Program and SHOU International Center for Marine Sciences
文摘We applied solution-based ICP-MS method to quantify the trace-elemental signatures in statoliths of jumbo flying squid, Dosidius gigas, which were collected from the waters off northern and central Chile during the scientific surveys carried out by Chinese squid jigging vessels in 2007 and 2008. The age and spawning date of the squid were back-calculated based on daily increments in statoliths. Eight elemental ratios(Sr/Ca, Ba/Ca, Mg/Ca, Mn/Ca, Na/Ca, Fe/Ca, Cu/Ca and Zn/Ca) were analyzed. It was found that Sr is the second most abundant element next to Ca, followed by Na, Fe, Mg, Zn, Cu, Ba and Mn. There was no significant relationship between element/Ca and sea surface temperature(SST) and sea surface salinity(SSS), although weak negative or positive tendency was found. MANOVA analysis showed that multivariate elemental signatures did not differ among the cohorts spawned in spring, autumn and winter, and no significant difference was found between the northern and central sampling locations. Classification results showed that all individuals of each spawned cohorts were correctly classified. This study demonstrates that the elemental signatures in D. gigas statoliths are potentially a useful tool to improve our understanding of its population structure and habitat environment.
文摘Issues concerning on the continental shelf and in the exclusive economic zone between Turkey and the Greek Cypriot Administration (GCA) have been more controversial. This study answers the following questions:(a) What is the main arguments of the Parties?(b) How the exclusive economic zone could be declared?(c) Does median line applicable to the delimitation law without taken the related circumstances in the Eastern Mediterranean?(d) Can any maps on claimed exclusive economic zone borders publish without maritime boundary delimitation agreements, officially? The main intent of the study is to evaluate the different perspectives of the Parties on maritime delimitation and to evaluate the boundaries of the exclusive economic zone bounded by the European Union on the European Asia and Europe Africa Interconnected Cable Network Projects maps in the Eastern Mediterranean.
文摘According to the concept of the Exclusive Economic Zone(EEZ) set out in the United Nations Convention on the Law of the Sea,the "Maritime Frontier"of China can be defined as extending 200 nautical miles from its coastal baseline.According to the UN principles
