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Guo B.,Ocean University of China | Guo B.,Bohai Fisheries Research Institute of Tianjin | Wang F.,Ocean University of China | Dong S.,Ocean University of China
Aquaculture | Year: 2013

Five light intensity treatments (60lx, "CL"; 600lx changed to 60lx, "FL1"; 1500lx changed to 60lx, "FL2"; 3000lx changed to 60lx, "FL3"; 6000lx changed to 60lx, "FL4") were tested to determine the growth of Litopenaeus vannamei under periodic light intensity change conditions. After 45-day experiment, shrimp in FL2 treatment showed the best weight gain (WG) and specific growth rate (SGRd), which might have been caused by high food conversion efficiency (FCEd), lowest energy allocation for respiration and excretion, and highest energy allocation for growth. The molting frequency in FL4 treatment was the lowest and significantly lower than those in other treatments, but the growth was not the worst. These results suggest that periodic light intensity fluctuation from 1500lx to 60lx could promote growth of L. vannamei which could be used as a pattern of regulation of light intensity in the commercial shrimp culture. © 2013 Elsevier B.V. Source


Wang W.,Chinese Academy of Fishery Sciences | Zhang K.,Chinese Academy of Fishery Sciences | Zhang K.,Ocean University of China | Luo K.,Chinese Academy of Fishery Sciences | And 4 more authors.
Fisheries Science | Year: 2014

We calculated the recapture rates for Chinese shrimp Fenneropenaeus chinensis following hatchery release in Jiaozhou Bay and Bohai Bay in 2012 based on parentage identification using simple sequence repeat (SSR) markers. The results and process were as follows: In total, 3 × 105 postlarval Chinese shrimp (inner marker), comprising six full-sib families, were released into Jiaozhou Bay with a hatchery release of approximately 9 × 107 same-sized stock in the spring. Eight shrimp (inner marker) were identified from 2,507 recapture catches in the autumn, with information about eight SSR loci available by using Cervus 3.0. Similarly, another six full-sib families, comprising 2.04 × 105 postlarvae, were released into Bohai Bay with a hatchery release of approximately 1.6 × 108 same-sized Chinese shrimp of postlarval stock, and four shrimp were identified from 3,232 recapture catches in the autumn. Furthermore, we calculated the number of released stock in the recapture catches, i.e., 2,400 and 3,137 in Jiaozhou Bay and Bohai Bay, respectively. Combined with statistics for Chinese shrimp resources during the autumn fishing season, we calculated that the recapture rates for Jiaozhou Bay and Bohai Bay were 2.70 and 2.59%, respectively, being slightly lower but more precise compared with results obtained using traditional methods (2.81 and 2.67%). © 2014 The Japanese Society of Fisheries Science. Source


Zhang K.,Chinese Academy of Fishery Sciences | Zhang K.,Ocean University of China | Xiao G.,Bohai Fisheries Research Institute of Tianjin | Wang W.,Chinese Academy of Fishery Sciences | And 3 more authors.
Russian Journal of Marine Biology | Year: 2015

We analyzed the genetic variation across six life periods that composed 3232 samples of a natural population of the Chinese shrimp Fenneropenaeus chinensis in Bohai Bay using 4 SSR (Simple Sequence Repeats) markers. Including the observed number of alleles (Na), eight genetic variation parameters were introduced to assess the genetic diversity and trace the changing genetic variation in this natural population. The genotype number detected on each locus in each stock ranged from 27 to 503; the detected average allele number was 36.5 per locus, and the PIC values of the 4 SSR loci ranged from 0.909 to 0.954. These all reflected the high variability on these 4 SSR loci. The rates of individual number vs. genotype number (Rig) on each locus across six life periods showed an increasing tendency, the minimum and maximum change ranges were detected on EN0033 with an Rig value from 1.35 to 2.91 and on locus FCKR002 with an Rig value from 352.00 to 9.50, respectively, which suggested an increase in genotype homogenization over time in 36 the development of the natural population. The genetic differentiation coefficients (Fst), ranged from 0.00003 to 0.00206, hinted there was no significant genetic differentiation among 6 stocks. The mainly genetic differentiation contributed 83.83% of the total variation that was detected within individuals also supported the above conclusion. Regarding the genotype percentage, there were five clear instances were detected with decreasing tendency on loci EN0033 and RS0622 in six stocks, which are consistent with a previous finding that an allele on RS0622 was related to WSSV (White Spot Syndrome Virus) resistance in F. chinensis. © 2015, Pleiades Publishing, Ltd. Source


Guo B.,Ocean University of China | Guo B.,Bohai Fisheries Research Institute of Tianjin | Mu Y.,Chinese Academy of Fishery Sciences | Wang F.,Ocean University of China | Dong S.,Ocean University of China
Aquaculture | Year: 2012

Six color treatments Yellow light (Y), Green light (G), Blue light (B), Blue light to Yellow light (BY), Blue light to Green light (BG), Green to Yellow light (GY) were tested to determine if light color change can promote the growth of Litopenaeus vannamai. After a 45-day experiment, shrimp in BG treatment showed the best weight gain (WG) and the specific growth rate (SGR d), which might have been caused by high food conversion efficiency (FCE d), lowest energy allocation for respiration and highest energy allocation for growth. The molting frequency in GY treatment was the highest, but the growth was not the best. These results suggest that the periodic fluctuation from blue region of the spectrum to green region of the spectrum could promote the growth of L. vannamei and this periodic light color fluctuation may be used as a pattern of regulation of light color in the commercial shrimp culture. © 2012 Elsevier B.V. Source


Guo B.,Bohai Fisheries Research Institute of Tianjin | Gong C.,Agricultural University of Hebei | Shao P.,Tian Jin Aquatic Product Technology Popularization Station | Jia L.,Bohai Fisheries Research Institute of Tianjin
Aquaculture International | Year: 2014

The purpose of this study was to compare the metabolism and immunity of Apostichopus japonicus (Selenka) after short-term transportation in seawater and without seawater by determining pyruvate kinase (PK) and lactate dehydrogenase as metabolism indicators, superoxide dismutases (SOD), and nitric oxide synthase (NOS) as immunity indicators. At 0, 1, 3, 6, 12, 24, 48, and 72 h after transportations, sea cucumbers were sampled and prepared for further analysis. The PK activities significantly decreased at 0 h after transportation without seawater, but not in seawater. These results indicated that the transportation without seawater had a stronger effect on sea cucumber than that in seawater. Firstly, the SOD and NOS activities of sea cucumbers in both methods of transportations significantly increased then decreased to the level of control. These results suggested that the SOD and NOS activity was induced to increase by stress of transportations, but these stresses did not damage the normal physiology of sea cucumbers. © 2013 Springer Science+Business Media Dordrecht. Source

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