Genetic Sex Identification and the Potential Evolution of Sex Determination in Pacific Halibut (Hippoglossus stenolepis)

2011 ◽  
Vol 13 (5) ◽  
pp. 1027-1037 ◽  
Author(s):  
Heather M. Galindo ◽  
Timothy Loher ◽  
Lorenz Hauser
Keyword(s):  
Sex Determination ◽  
Sex Identification ◽  
Evolution Of Sex ◽  
Pacific Halibut ◽  
Hippoglossus Stenolepis ◽  
Genetic Sex Identification

Genetic sex identification and the potential sex determination system in the yellow drum (Nibea albiflora)

Aquaculture ◽  
2018 ◽  
Vol 492 ◽  
pp. 253-258 ◽  
Author(s):  
Sha Sun ◽  
Wanbo Li ◽  
Shijun Xiao ◽  
Aiqiang Lin ◽  
Zhaofang Han ◽  
...  
Keyword(s):  
Sex Determination ◽  
Sex Identification ◽  
Genetic Sex Identification ◽  
Determination System ◽  
Nibea Albiflora ◽  
Sex Determination System

scholarly journals Evolution of Sex Determination in Caenorhabditis: Unusually High Divergence of tra-1 and Its Functional Consequences

Genetics ◽  
1996 ◽  
Vol 144 (2) ◽  
pp. 587-595 ◽  
Author(s):  
Mario de Bono ◽  
Jonathan Hodgkin
Keyword(s):  
Sex Determination ◽  
Germ Line ◽  
Amino Acid Identity ◽  
Evolution Of Sex ◽  
Phenotypic Differences ◽  
C Elegans ◽  
Functional Studies ◽  
Somatic Gonad ◽  
Functional Consequences ◽  
Significant Divergence

Abstract The tra-1 gene is a terminal regulator of somatic sex in Caenorhabditis elegans: high tra-1 activity elicits female development, low tra-1 activity elicits male development. To investigate the function and evolution of tra-1, we examined the tra-1 gene from the closely related nematode C. briggsae. Ce-tra-1 and Cb-tra-1 are unusually divergent. Each gene generates two transcripts, but only one of these is present in both species. This common transcript encodes TRA-1A, which shows only 44% amino acid identity between the species, a figure much lower than that for previously compared genes. A Cb-tra-1 transgene rescues many tissues of tra-1(nul1) mutants of C. elegans but not the somatic gonad or germ line. This transgene also causes nongonadal feminization of XO animals, indicating incorrect sexual regulation. Alignment of Ce-TRA-1A and Cb-TRA-1A defines several conserved regions likely to be important for tra-1 function. The phenotypic differences between Ce-tra-1(null) mutants rescued by Cb-tra-1 transgenes and wild-type C. elegans indicate significant divergence of regulatory regions. These molecular and functional studies suggest that evolution of sex determination in nematodes is rapid and genetically complex.

A rapid and reliable method for genetic sex identification in sea cucumber, Apostichopus japonicus

Aquaculture ◽  
2021 ◽  
pp. 737021
Author(s):  
Jin-Liang Wei ◽  
Jing-Jing Cong ◽  
Zhi-Hui Sun ◽  
Jian Song ◽  
Chong Zhao ◽  
...  
Keyword(s):  
Sea Cucumber ◽  
Reliable Method ◽  
Apostichopus Japonicus ◽  
Sex Identification ◽  
Genetic Sex Identification

scholarly journals Evidence for rapid avoidance of rockfish habitat under reduced quota and comprehensive at-sea monitoring in the British Columbia Pacific halibut fishery

2020 ◽  
Vol 77 (8) ◽  
pp. 1409-1420
Author(s):  
Robyn E. Forrest ◽  
Ian J. Stewart ◽  
Cole C. Monnahan ◽  
Katherine H. Bannar-Martin ◽  
Lisa C. Lacko
Keyword(s):  
British Columbia ◽  
Spatial Clustering ◽  
Clustering Methods ◽  
Quota System ◽  
Encounter Rates ◽  
System A ◽  
Pacific Halibut ◽  
Hippoglossus Stenolepis ◽  
Footprint Area ◽  
Management Changes

The British Columbia longline fishery for Pacific halibut (Hippoglossus stenolepis) has experienced important recent management changes, including the introduction of comprehensive electronic catch monitoring on all vessels; an integrated transferable quota system; a reduction in Pacific halibut quotas; and, beginning in 2016, sharp decreases in quota for yelloweye rockfish (Sebastes ruberrimus, an incidentally caught species). We describe this fishery before integration, after integration, and after the yelloweye rockfish quota reduction using spatial clustering methods to define discrete fishing opportunities. We calculate the relative utilization of these fishing opportunities and their overlap with areas with high encounter rates of yelloweye rockfish during each of the three periods. The spatial footprint (area fished) increased before integration, then decreased after integration. Each period showed shifts in utilization among four large fishing areas. Immediately after the reductions in yelloweye rockfish quota, fishing opportunities with high encounter rates of yelloweye rockfish had significantly lower utilization than areas with low encounter rates, implying rapid avoidance behaviour.

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