Enteroctopus dofleini(GPO, Giant Pacific Octopus) Wülker, 1910

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,662
Reaction score
1,821
Location
Gainesville, GA
Chapter 19 (BSAI) Octopus Complex 2007Alaska Fisheries Science Center
November 2007

Study findings on regulating octopus catch in Alaskan waters (Bering Sea). Long and somewhat repetitive but interesting report on trying to determine if and how to regulate Alaskan octopuses. Much of the data came from observers like Greg

Abstracts from the Giant Pacific Octopus Symposium And Workshop, Seattle Aquarium March 2012
 

GPO87

Sepia elegans
Staff member
Moderator
Joined
Jan 6, 2005
Messages
818
Reaction score
197
Location
Dancing between Vancouver and Auckland
HOLD IT! There was a GPO workshop in Seattle? Why was I not informed/ asked to be the guest of honour? Surely my name gives me some sort of entitlement. :roll: Hmmm, perhaps it's because I was the 87th in line.... I'll have to do something about that.

Very cool find, D. I'll have to keep my eyes open to see if this becomes an annual thing!
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,662
Reaction score
1,821
Location
Gainesville, GA
The post is dated 8/17 but it does not say when the workshop took place. Still worth investigating though as it might give you a an official reason to go home for a visit :biggrin2:
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,662
Reaction score
1,821
Location
Gainesville, GA
A COMPLEX PATTERN OF POPULATION STRUCTURE IN THE NORTH PACIFIC GIANT OCTOPUS ENTEROCTOPUS DOFLEINI Patrick D. Barry,Sherry L. Tamone, David A. Tallmon

Abstract

We investigated the population structure of the North Pacific giant octopus, Enteroctopus dofleini (Wülker, 1910) in Alaskan waters. Octopuses were collected from five locations (Dutch Harbor [DH; n = 45], Kachemak Bay [KB; n = 45], Prince William Sound [PWS; n = 18], Glacier Bay [GB; n = 33], and Stephen's Passage [SP; n = 39]). All samples were sequenced at the cytochrome oxidase I (COI) locus of the mitochondrial genome. We identified two major mtDNA haplogroups. Sequence divergence ranged from 0.2 to 2.9%. Haplotypes were not distributed evenly among the sampled populations, producing an enigmatic pattern of population structure. We observed no genetic differentiation between DH, KB and GB, or between PWS and SP. FST was extremely high for all other pairwise comparisons, ranging from 0.871–0.948. We did not observe an isolation-by-distance pattern or a strong clinal gradient in haplotype frequencies, as typically detected in other marine species. Strong genetic drift, serial bottlenecks or sweepstakes events may contribute to the pattern observed. The high level of sequence divergence observed at the COI locus could also suggest cryptic species within the E. dofleini complex, with limited geographical overlap of populations and gene flow. Additional samples were contributed by researchers from British Columbia [n = 1], Seaside, Oregon [n = 4], Neah Bay, Washington [n = 2], Puget Sound, Washington [n = 1], and Kodiak Island, Alaska [n = 2)] While sample sizes were low for these locations, prompting their exclusion from population based analyses, all individuals were of the predominate haplotype found in Alaska.
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,662
Reaction score
1,821
Location
Gainesville, GA
Not scientific but the video is the best I have seen to demonstrate how octopuses can fit through very small spaces.
[video]http://www.liveleak.com/view?i=68e_1364664200[/video]
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,662
Reaction score
1,821
Location
Gainesville, GA
Multiple Paternity and Preliminary Population Genetics of Giant Pacific Octopuses, Enteroctopus dofleini, in Oregon, Washington and the Southeast Coast of Vancouver Island, BC Shawn Larson , Catherine Ramsay, James A. Cosgrove 2015 (pdf)

Abstract: A total of 77 giant Pacific octopus, Enteroctopus dofleini, tissue samples were collected from the Oregon Coast (OR), Neah Bay Washington (NB), Puget Sound Washington (PS) and the southeast coast of Vancouver Island, British Columbia, Canada (BC) for genetic analyses. A suite of eight variable microsatellite markers developed from giant Pacific octopuses were amplified in these samples to determine population diversity, structure, relatedness and paternity. The majority of loci met Hardy-Weinberg equilibrium expectations within each population. We found moderate genetic diversity (average observed heterozygosity = 0.445, range = 0.307–0.515 and average expected heterozygosity = 0.567, range = 0.506–0.696) and moderate population structuring with distinct separation of groups (FST values ranged from 0.101 between BC and PS to 0.237 between BC and NB). Several egg strings from the BC population were collected from three female octopus dens for relatedness and paternity analyses. Results suggest strong support for multiple paternity within one egg clutch with progeny sired by between two to four males.
 

DWhatley

Kraken
Staff member
Moderator
Joined
Sep 4, 2006
Messages
20,662
Reaction score
1,821
Location
Gainesville, GA
RETROSPECTIVE REVIEW OF MORTALITY IN GIANT PACIFIC OCTOPUS (ENTEROCTOPUS DOFLEINI)
Kathryn E. Seeley , D.V.M., Leigh A. Clayton , D.V.M., Dipl. A.B.V.P. (Avian, Reptile/Amphibian), Catherine A. Hadfield , M.A., VetM.B., Dipl. E.C.Z.M., Dipl. A.C.Z.M., Dillon Muth , D.V.M., Joseph L. Mankowski , D.V.M., Ph.D., Dipl. A.C.V.P., andKathleen M. Kelly , D.V.M., Ph.D., Dipl. A.C.V.P. 2016 (subscription - Journal of Zoo and Wildlife Medicine)

Abstract
The giant Pacific octopus (Enteroctopus dofleini) is a popular exhibit species in public display aquaria, but information on health and disease is limited. This retrospective review evaluates time in collection and describes antemortem clinical signs and pathology of giant Pacific octopuses in an aquarium setting. Between March 2004 and December 2013, there were 19 mortalities: eight males, 10 females, and one individual whose sex was not recorded. Average time spent in collection for all octopuses was 375 ± 173 days (males 351 ± 148 days, females 410 ± 196 days). Ten (52.6%) of the octopuses were sexually mature at the time of death, six (31.6%) were not sexually mature, and reproductive status could not be determined in three octopuses (15.8%). Minimal changes were noted on gross necropsy but branchitis was histologically evident in 14 octopuses, often in conjunction with amoeboid or flagellate parasites. Senescence, parasitism, and husbandry were all important contributors to mortality and should be considered when caring for captive octopuses.
 

Members online

No members online now.

Latest Posts

Forum statistics

Threads
20,189
Messages
204,776
Members
8,892
Latest member
octopod

Monty Awards

TONMOCON IV (2011): Terri
TONMOCON V (2013): Jean
TONMOCON VI (2015): Taollan
TONMOCON VII (2018): ekocak

About the Monty Awards

Top