Data

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

Australian Ocean Data Network
Leporati, Stephen
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/fc56b090-44a3-11dc-8cd0-00188b4c0af8&rft.title=The Fishery Biology and Population Dynamics of the pale octopus (Octopus pallidus)&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/fc56b090-44a3-11dc-8cd0-00188b4c0af8&rft.description=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.Maintenance and Update Frequency: notPlannedStatement: 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.&rft.creator=Leporati, Stephen &rft.date=2008&rft.coverage=westlimit=145.11; southlimit=-40.9; eastlimit=145.73; northlimit=-40.3&rft.coverage=westlimit=145.11; southlimit=-40.9; eastlimit=145.73; northlimit=-40.3&rft.coverage=uplimit=51; downlimit=26&rft.coverage=uplimit=51; downlimit=26&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=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).&rft_rights=Please contact researcher for access to the data&rft_rights=The data described in this record are the intellectual property of Stephen Leporati.&rft_subject=biota&rft_subject=FISHERIES&rft_subject=EARTH SCIENCE&rft_subject=AGRICULTURE&rft_subject=AGRICULTURAL AQUATIC SCIENCES&rft_subject=Biosphere | Ecological Dynamics | Life History&rft_subject=POPULATION DYNAMICS&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=SPECIES/POPULATION INTERACTIONS&rft_subject=Octopus pallidus&rft_subject=Age&rft_subject=Growth&rft_subject=Seasonal effects&rft_subject=Fisheries Sciences not elsewhere classified&rft_subject=AGRICULTURAL AND VETERINARY SCIENCES&rft_subject=FISHERIES SCIENCES&rft_subject=Invertebrate Biology&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ZOOLOGY&rft_subject=Population Ecology&rft_subject=ECOLOGY&rft_subject=Total weight&rft_subject=Sex&rft_subject=Ventral mantle length&rft_subject=Dorsal mantle length&rft_subject=Head width&rft_subject=Stylet length&rft_subject=Stylet width&rft_subject=Stylet weight&rft_subject=Growth rate&rft_subject=Reproductive organs weight&rft_subject=Reproductive stage&rft_subject=Clutch size&rft_subject=Egg size&rft.type=dataset&rft.language=English Access the data
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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).

Please contact researcher for access to the data

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

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Brief description

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.

Lineage

Maintenance and Update Frequency: notPlanned
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.

Notes

Credit
Dr Jayson Semmens
Purpose
The purpose of this study was to determine the life history characteristics and dynamics of a wild octopus population.

Created: 02 09 2008

Data time period: 11 2004 to 30 11 2006

This dataset is part of a larger collection

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145.73,-40.3 145.73,-40.9 145.11,-40.9 145.11,-40.3 145.73,-40.3

145.42,-40.6

text: westlimit=145.11; southlimit=-40.9; eastlimit=145.73; northlimit=-40.3

text: uplimit=51; downlimit=26

Subjects
Agricultural and Veterinary Sciences | AGRICULTURAL AQUATIC SCIENCES | AGRICULTURE | Age | Biological Sciences | BIOSPHERE | Biosphere | Ecological Dynamics | Life History | Clutch size | Dorsal mantle length | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Ecology | Egg size | Fisheries | Fisheries Sciences | Fisheries Sciences Not Elsewhere Classified | Growth | Growth rate | Head width | Invertebrate Biology | Octopus pallidus | Population Dynamics | Population Ecology | Reproductive organs weight | Reproductive stage | SPECIES/POPULATION INTERACTIONS | Seasonal effects | Sex | Stylet length | Stylet weight | Stylet width | Total weight | Ventral mantle length | Zoology | biota |

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  • global : fc56b090-44a3-11dc-8cd0-00188b4c0af8