scholarly journals Preliminary evaluation of the effect of juvenile hormone III and methyl farnesoate on spermatophore quality of the white shrimp, Litopenaeus vannamei Boone, 1931 (Decapoda: Penaeidae)

2008 ◽  
Vol 43 (1) ◽  
Author(s):  
Jorge Alfaro ◽  
Gerardo Zúñiga ◽  
Andrea García ◽  
Ericka Rojas
Keyword(s):  
Juvenile Hormone ◽  
Litopenaeus Vannamei ◽  
White Shrimp ◽  
Preliminary Evaluation ◽  
Methyl Farnesoate ◽  
Juvenile Hormone Iii

scholarly journals Genomic Characterization and Expression of Juvenile Hormone Esterase-Like Carboxylesterase Genes in Pacific White Shrimp, Litopenaeus vannamei

2020 ◽  
Vol 21 (15) ◽  
pp. 5444
Author(s):  
Xiaoxi Zhang ◽  
Jianbo Yuan ◽  
Xiaojun Zhang ◽  
Jianhai Xiang ◽  
Fuhua Li
Keyword(s):  
Juvenile Hormone ◽  
Litopenaeus Vannamei ◽  
Pacific White Shrimp ◽  
White Shrimp ◽  
Methyl Farnesoate ◽  
Juvenile Hormone Esterase ◽  
Main Site ◽  
Physiological Processes ◽  
Key Enzyme ◽  
Specific Expansion

The sesquiterpenoid methyl farnesoate (MF), a juvenile hormone (JH) analog, plays important roles in many physiological processes of crustaceans, such as morphogenesis, molting and reproduction. Juvenile hormone esterase-like (JHE-like) carboxylesterase (CXE) is a key enzyme in MF degradation, playing a significant role in regulating MF titer. However, its function is barely known in shrimp. In this study, a total of 21 JHE-like CXEs (LvCXEs) were characterized in Pacific white shrimp Litopenaeus vannamei, based on the full genome and multi-transcriptomic data. LvCXE has a conserved triplet catalytic site (Ser-Glu-His) and a characteristic GxSxG motif. Most LvCXEs were highly expressed in the hepatopancreas, which was the main site for MF degradation. LvCXEs containing a GESAG motif showed a specific expansion in the L. vannamei genome. Those GESAG-containing LvCXEs presented differential expressions at different larvae stages and different molting stages of L. vannamei, which suggested their potential functions in development and molting. Additionally, when the transcription level of CXEs was inhibited, it could lead to failed molt and death of L. vannamei. When we further detected the expression levels of the key ecdysone responsive transcription factors including LvE75, LvBr-C, LvHr3 and LvFtz-f1 after the CXE inhibitor was injected into L. vannamei, they all showed apparent down-regulation. These results suggested that the expansion of LvCXEs in the L. vannamei genome should contribute to the regulation of metamorphosis at larvae stages and frequent molting during the growth of L. vannamei.

scholarly journals Effect of Cell-Free Supernatant from Aeromonas sobria on the Spoilage of Shewanella putrefaciens in Pacific White Shrimp (Litopenaeus vannamei) with the Influence of Temperature Fluctuation

2019 ◽  
Vol 9 (3) ◽  
pp. 587 ◽  
Author(s):  
Jing-Xin Ye ◽  
Sheng-Ping Yang ◽  
Yun-Fang Qian ◽  
Jing Xie
Keyword(s):  
Litopenaeus Vannamei ◽  
Temperature Fluctuation ◽  
Experimental Period ◽  
Shewanella Putrefaciens ◽  
Pacific White Shrimp ◽  
Cold Chain ◽  
White Shrimp ◽  
Cell Free Supernatant ◽  
Aeromonas Sobria

The objective of this study was to evaluate the effect of cell-free supernatant (CFS) from Aeromonas sobria on the growth and spoilage potential of Shewanella putrefaciens in Pacific white shrimp (Litopenaeus vannamei) during cold chain logistics, including transportation, retailing, and domestic storage. It was shown that the quality of shrimps deteriorated in the cold chain logistics over time. The temperature fluctuation during the experimental period favored the growth of S. putrefaciens, increased the total volatile basic nitrogen (TVB-N) and biogenic amine value, and decreased the sensory quality of shrimps. The application of CFS resulted in the decline on the growth of S. putrefaciens after the early stationary phase stored at a cold condition. It is concluded that the application of CFS can inhibit microbial growth and the spoilage potential of S. putrefaciens and offset the quality deterioration of shrimp exposed to temperature fluctuation during cold chain logistics.

scholarly journals Cold Plasma: An Alternative in Litopenaeus vannamei Shrimp Preservation

2021 ◽  
Vol 9 (2) ◽  
pp. 521
Author(s):  
Lucas De Oliveira Soares Rebouças ◽  
Julianna Paula do Vale Figueiredo ◽  
Maria Carla da Silva Campelo ◽  
Jovilma Maria Soares De Medeiros ◽  
Renata Bezerra Gomes Rebouças ◽  
...  
Keyword(s):  
Shelf Life ◽  
Thermal Plasma ◽  
Litopenaeus Vannamei ◽  
Cold Plasma ◽  
Microbial Growth ◽  
Quality Attributes ◽  
Pacific White Shrimp ◽  
White Shrimp ◽  
Non Thermal Plasma

This study aimed evaluating the effects of cold plasma on the quality attributes of Pacific white shrimp (Litopenaeus vannamei). Shrimp were divided into 4 sample groups: one control and the remaining groups subjected to cold plasma at frequencies of 5, 10, and 15 kHz, respectively, during 10 minutes of application followed by evaluation of chemical, physical, microbiological, and sensorial characteristics. Cold plasma contributed significantly to the maintenance of shrimp quality during storage, delaying the melanization process, microbial growth, improving the physicochemical and sensorial qualities of the samples. Exposure of white shrimp to non-thermal plasma at 15 kHz promoted better physicochemical, microbiological, and sensorial results, and increased the shelf life of samples by 5 days, suggesting that the treatment is effective to preserve the quality of shrimp.

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