The Fishery Biology and Population Dynamics of the pale octopus (Octopus pallidus)

The data was collected from 2 years of field sampling from the commerical octopus (Octopus pallidus) fishery in NW Tasmania in Bass Strait. The data consists of morphological, reproductive and ageing information.

Simple

Identification info

Date (Creation)
2008-09-02T14:14:00

Principal investigator

Tasmanian Aquaculture and Fisheries Institute (TAFI) - Leporati, Stephen (PhD Student)
Private Bag 49
Hobart
TAS
7001
Australia
Purpose
The purpose of this study was to determine the life history characteristics and dynamics of a wild octopus population.
Credit
Dr Jayson Semmens
Status
Completed

Principal investigator

Department of Fisheries (DoF), Western Australian Government - Leporati, Stephen, Dr (Research Scientist (Molluscs))

Point of contact

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Pecl, Gretta, Dr (PhD Supervisor)
IMAS - Taroona
Private Bag 49
Hobart
Tasmania
7001
Australia
ORCID ID >

Topic category
  • Biota

Extent

N
S
E
W


Temporal extent

Time period
2004-11-01T00:00:00 2006-11-30T14:27:00

Vertical element

Minimum value
26
Maximum value
51
Identifier
EPSG::5715
Name
MSL depth
Maintenance and update frequency
Not planned

Resource format

Title
Microsoft Access (mdb)
Date
Edition
-
Global Change Master Directory Earth Science Keywords v5.3.8
  • Agriculture | Agricultural Aquatic Sciences | Fisheries
  • Biosphere | Ecological Dynamics | Life History
  • Biosphere | Ecological Dynamics | Population Dynamics
Keywords (Taxon)
  • Octopus pallidus
Keywords (Theme)
  • Age
  • Growth
  • Seasonal effects
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
Keywords (Theme)
  • Total weight
  • Sex
  • Age
  • Ventral mantle length
  • Dorsal mantle length
  • Head width
  • Stylet length
  • Stylet width
  • Stylet weight
  • Growth rate
  • Reproductive organs weight
  • Reproductive stage
  • Clutch size
  • Egg size

Resource constraints

Classification
Unclassified

Resource constraints

Use limitation
The data described in this record are the intellectual property of Stephen Leporati.

Resource constraints

Linkage
http://i.creativecommons.org/l/by/2.5/au/88x31.png

License Graphic

Title
Creative Commons Attribution 2.5 Australia License


>

Website
http://creativecommons.org/licenses/by/2.5/au/

License Text

Other constraints
The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).
Other constraints
Please contact researcher for access to the data
Language
English
Character encoding
UTF8
Environment description
Uni_file_Id: TAS_SL_20070718_885
Supplemental Information
Leporati, S, Fisheries biology and population dynamics of the pale octopus (Octopus pallidus) (2008). PhD thesis, University of Tasmania Papers: Leporati, S and Semmens, JM and Pecl, GT, Determining the age and growth of wild octopus using stylet increment analysis, Marine Ecology Progress Series, 367 pp. 213-222. ISSN 0171-8630 (2008) Leporati, S and Pecl, GT and Semmens, JM, Reproductive status of Octopus pallidus, and its relationship to age and size, Marine Biology, 155, (4) pp. 375-385. ISSN 0025-3162 (2008)

Content Information

Content type
Physical measurement
Name
Total weight

Name
Grams
Name
Sex

Name
Age

Name
Ventral mantle length

Name
mm
Name
Dorsal mantle length

Name
mm
Name
Head width

Name
mm
Name
Stylet length

Name
mm
Name
Stylet width

Name
mm
Name
Stylet weight

Name
Grams
Name
Growth rate

Name
% body weight per day
Name
Reproductive organs weight

Name
Grams
Name
Reproductive stage

Name
Clutch size

Name
Egg size

Name
mm

Resource lineage

Statement
Age data: Samples were collected every second month during April 2005 to November 2006 (10 independent trips) from Bass Strait waters off northwestern Tasmania, Australia. A dedicated unbaited bottom-set long line approximately 1000 m in length at a depth of 26 m, first set on 15 February 2005, was used to collect specimens. After landing, morphological measurements were taken and dissections performed on fresh specimens. The octopuses were weighed and measured to the nearest 0.1 g and 1 mm, respectively, and measurements were taken of dorsal mantle length, ventral mantle length and head width. A total of 113 males and 536 females were caught, of which 109 (96%) of the males and 485 (90%) of the females were processed for ageing analysis. Further information on stylet preparation can be found in the published paper. Reproductive data: Samples were collected during November 2004 to November 2006, over 21 independent sampling trips, in Bass Strait. Bottom set long lines were used to collect the samples. The lines were ~3.7 km long with ~500 pots attached (pot volume = 3,000 ml) made from moulded plastic and set on sandy substrates at 18 locations at variable depths of 26.0–50.4 m (mean 35.0 m, ± 1.21 SE). To determine the effects of continual fishing pressure on the age and reproductive structure of a localised population, a shorter (1 km) single research line was maintained at the one continuous location. For biological sampling a target sub-sample of at least 70 individuals was set for each trip. After landing, morphological measurements and dissections were performed on fresh specimens. Whole weight (WW) and eviscerated body weight were measured and the visceral mass of each specimen fixed in formaldehyde (10%), acetic acid (5%), calcium chloride (1.3%) and freshwater (83.7%) solution. After a period of 14–28 days the visceral mass was transferred to 70% ethanol for preservation. The reproductive organs of a sub-sample of 50 females in various reproductive stages were freshly weighed prior to preservation, and again after 14 days, in order to determine the effects of preservation on the weight of the reproductive organs. The reproductive organs were removed from the preserved visceral mass and weighed to 0.001 g for each octopus. The parameters measured for males were: the whole reproductive complex (MRW), which was then dissected so the testis, and Needham’s sack could be weighed independently. The presence or absence of spermatophores in the Needham’s sack and penis was noted. Parameters weighed for females were: the whole reproductive complex (FRW), which was then dissected so the ovary, left and right distal oviducts, left and right oviducal glands, and left and right proximal oviducts could be weighed independently. Somatic weight was determined by subtracting the weight of the MRW or FRW from the WW. Further information on staging of maturity, fecundity and egg size measurement, and ageing can be found in the published paper.
Hierarchy level
Dataset

Metadata

Metadata identifier
fc56b090-44a3-11dc-8cd0-00188b4c0af8

Language
English
Character encoding
UTF8

Point of contact

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - IMAS Data Manager

Type of resource

Resource scope
Dataset
Metadata linkage
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/fc56b090-44a3-11dc-8cd0-00188b4c0af8

Point of truth URL of this metadata record

Date info (Creation)
2015-09-03T15:39:22
Date info (Revision)
2015-09-03T15:39:22

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

Spatial extent

N
S
E
W


Keywords

Age Age Clutch size Dorsal mantle length Egg size Growth Growth rate Head width Reproductive organs weight Reproductive stage Seasonal effects Sex Stylet length Stylet weight Stylet width Total weight Ventral mantle length
Global Change Master Directory Earth Science Keywords v5.3.8
Agriculture | Agricultural Aquatic Sciences | Fisheries Biosphere | Ecological Dynamics | Life History Biosphere | Ecological Dynamics | Population Dynamics

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