D'Entrecasteaux Channel water sampling (KSA324 assessment 2023)

Data were collected by third-year students on a KSA324 field excursion down the D'Entrecasteaux Channel, on the IMAS vessel Noctiluca. The purpose of the trip was for students to learn how to collect various common types of oceanographic data and work on a research vessel. The study was designed to assess the impact of finfish farming in the Channel on local nutrient levels and water quality. The Tasmanian Environment Protection Authority (EPA) methods for water quality monitoring around finfish farms (Ford 2021, p. 6 – 18) were replicated as closely as possible. The null hypothesis for this study was that, on the 17/04/2023, all measured physico-chemical and biological factors were not significantly above the levels specified by the EPA guidelines (Ford 2021, p. 6 – 18), in any of the four stations measured. These four stations were chosen because they were all further than 35 metres beyond the boundary of any finfish farms’ Lease Area, as specified by the EPA guidelines document (Ford 2021, p. 6). The precise latitudes and longitudes of these stations are as follows: M1 (-43.059295, 147.345047); M2 (-43.056057, 147.291386); M3 (-43.123841, 147.290882); M4 (-43.133534, 147.326519).


The dataset includes measurements of temperature, conductivity, oxygen concentration, pH, turbidity, fluorescence and pressure taken by the CTD rosette. Depth, density, practical salinity, absolute salinity and conservative temperature were derived and also included. The dataset also contains bottle sample measurements of oxygen, pH and alkalinity, as well as both the total and dissolved concentrations of ammonia, NOx, nitrite, phosphate and silicate. Chlorophyll concentration, total plankton cell counts, and counts of only Gymnodinium catenatum (a toxic, invasive dinoflagellate) cells were also included in the dataset. The dataset also contains the Secchi depth at each station. Empty cells are indicated by “NA”. ODV data flagging convention was used: 0 = good quality; 1 = unknown quality; 4 = questionable quality; 8 = bad quality.


Reference:

Ford, W (Director for the Environment Protection Authority) 2021, Environmental Licence No. 9869/3, Environmental Licence under the Environmental Management and Pollution Control Act 1994, pp. 6 – 18.

Simple

Identification info

Date (Publication)
2025-07-07T00:00:00

Resource provider

Institute for Marine and Antarctic Studies (IMAS)
Private Bag 129
Hobart
Tasmania
7001
Australia

Author

Institute for Marine and Antarctic Studies - Hingston, Tarn
IMAS - Hobart
Private Bag 129
Hobart
TAS
7001
Australia

Point of contact

Institute for Marine and Antarctic Studies - van der Merwe, Piere
IMAS - Hobart
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

Credit
IMAS KSA 324 Oceanographic Methods
Credit
KSA324 Oceanographic Methods class 2023 (IMAS)
Status
Completed

Author

Institute for Marine and Antarctic Studies - Hingston, Tarn
Private Bag 129
Hobart
TAS
7001
Australia

Point of contact

Institute for Marine and Antarctic Studies - van der Merwe, Piere
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

Topic category
  • Biota
  • Oceans

Extent

N
S
E
W


Temporal extent

Time period
2023-03-27 2023-03-27

Vertical element

Minimum value
0
Maximum value
21
Identifier
EPSG::5715
Name
MSL depth
Maintenance and update frequency
Not planned
Global Change Master Directory Earth Science Keywords, Version 8.5
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research

Resource constraints

Use limitation
Data, products and services from IMAS are provided "as is" without any warranty as to fitness for a particular purpose.

Resource constraints

Linkage
https://licensebuttons.net/l/by/4.0/88x31.png

License Graphic

Title
Creative Commons Attribution 4.0 International License
Alternate title
CC-BY
Edition
4.0


>

Website
https://creativecommons.org/licenses/by/4.0/

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)."
Language
English
Character encoding
UTF8

Content Information

Content type
Physical measurement

Identifier

Code
Station
Name
station

Name
None

Identifier

Code
Latitude
Name
lat

Name
Decimal degrees

Identifier

Code
Longitude
Name
lon

Name
Decimal degrees

Identifier

Code
Date
Name
date

Name
AEST

Identifier

Code
Start time
Name
start_time

Name
24 hour, local time

Identifier

Code
End time
Name
end_time

Name
24 hour, local time

Identifier

Code
Depth
Name
depth

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/ULAA
Name
Metres

Identifier

Code
In-situ temperature
Name
temp_insitu

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPAA
Name
Degrees Celsius

Identifier

Code
In-situ temperature quality control
Name
temp_insitu_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Electrical conductivity of the water body
Name
conductivity

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UECA
Name
Siemens per metre

Identifier

Code
Electrical conductivity of the water body quality control
Name
conductivity_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Practical salinity of the water body
Name
salinity_prac

Identifier
http://vocab.aodn.org.au/def/unitsofmeasure/entity/481
Name
Practical Salinity Unit

Identifier

Code
Density of the water body
Name
density

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UKMC
Name
Kilograms per cubic metre

Identifier

Code
Concentration of oxygen {O2} per unit volume of the water body
Name
oxygen

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMGL
Name
Milligrams per litre

Identifier

Code
Concentration of oxygen {O2} per unit volume of the water body quality control
Name
oxygen_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
pH (total scale) of the water body
Name
ph

Name
None

Identifier

Code
pH (total scale) of the water body quality control
Name
ph_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Turbidity of the water body
Name
turbidity

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/USTU
Name
Nephelometric Turbidity Units

Identifier

Code
Turbidity of the water body quality control
Name
turbidity_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Fluorescence of the water body
Name
fluorescence

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMMC
Name
Milligrams per cubic metre

Identifier

Code
Fluorescence of the water body quality control
Name
fluorescence_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Descent rate of CTD rosette
Name
descent_rate

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UVAA
Name
Metres per second

Identifier

Code
Pressure (measured variable) in the water body exerted by overlying sea water and any medium above it
Name
pressure

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPDB
Name
Decibars

Identifier

Code
Pressure (measured variable) in the water body exerted by overlying sea water and any medium above it quality control
Name
pressure_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Absolute salinity of the water body
Name
absolute_salinity

Name
Grams per kilogram

Identifier

Code
Conservative temperature of the water body
Name
conservative_temperature

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPAA
Name
Degrees Celsius

Identifier

Code
Concentration of oxygen {O2} per unit volume of the water body
Name
oxygen_bottle

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMLL
Name
Millilitres per litre

Identifier

Code
Concentration of oxygen {O2} per unit volume of the water body quality control
Name
oxygen_bottle_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
pH (total scale) of the water body
Name
ph_bottle

Name
None

Identifier

Code
pH (total scale) of the water body quality control
Name
ph_bottle_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Total alkalinity per unit mass of the water body
Name
alkalinity_bottle

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPPM
Name
Parts per million

Identifier

Code
Total alkalinity per unit mass of the water body quality control
Name
alkalinity_bottle_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Concentration of dissolved ammonia in the water body
Name
ammonia_dissolved

Name
Micromolar

Identifier

Code
Total concentration of ammonia in the water body
Name
ammonia_total

Name
Micromolar

Identifier

Code
Concentration of dissolved nitrate and nitrite {NO3 and NO2} per unit volume of the water body
Name
nox_dissolved

Name
Micromolar

Identifier

Code
Concentration of dissolved nitrite {NO2} per unit volume of the water body
Name
nitrite_dissolved

Name
Micromolar

Identifier

Code
Total concentration of nitrite {NO2} per unit volume of the water body
Name
nitrite_total

Name
Micromolar

Identifier

Code
Total concentration of nitrite {NO3 and NO2} per unit volume of the water body
Name
nox_total

Name
Micromolar

Identifier

Code
Concentration of dissolved phosphate {PO4} per unit volume of the water body
Name
phosphate_dissolved

Name
Micromolar

Identifier

Code
Total concentration of phosphate {PO4} per unit volume of the water body
Name
phosphate_total

Name
Micromolar

Identifier

Code
Concentration of dissolved silicate {SiO4} per unit volume of the water body
Name
silicate_dissolved

Name
Micromolar

Identifier

Code
Total concentration of silicate {SiO4} per unit volume of the water body
Name
silicate_total

Name
Micromolar

Identifier

Code
Quality control for all Niskin bottle nutrient samples
Name
all_nutrients_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Plankton cell count
Name
cell_count

Name
None

Identifier

Code
Plankton cell count quality control
Name
cell_count_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Count of Gymnodinium catenatum cells
Name
GC_count

Name
None

Identifier

Code
Count of Gymnodinium catenatum cells quality control
Name
GC_count_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Concentration of chlorophyll-a per unit volume of the water body
Name
chl

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMMC
Name
Milligrams per cubic metre

Identifier

Code
Concentration of chlorophyll-a per unit volume of the water body quality control
Name
chla_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Identifier

Code
Secchi depth
Name
Secchi

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/ULAA
Name
Metres

Identifier

Code
Secchi depth quality control
Name
Secchi_QC

Name
0=Good; 1=Unknown; 4=Questionable; 8=Poor

Distribution Information

Distribution format
  • Comma Separated Values (CSV)

OnLine resource
DATA DOWNLOAD - <Collated data> (20KB csv)

Resource lineage

Statement
At each site, the SBE 55 ECO rosette, fitted with the SBE 19plus CTD, SBE 43 DO sensor, SBE 18 pH sensor and ECO fluorometer, was lowered to roughly 1m above the seafloor. On the ascent, in-situ measurements of temperature, conductivity, turbidity, pressure, oxygen concentration, pH and fluorescence were taken every one metre, until the surface. Water samples were also taken by three 5L Niskin bottles on the ascent: the first around 3m above the seafloor; the third roughly 1m below the surface; and the second half-way between the two. From the Niskin water samples, oxygen, pH and alkalinity were measured immediately in that order, from 100mL sample containers, using the HQ 4300 Portable Multi-Meter. Oxygen was measured with two replicates, pH with three replicates and alkalinity only once. Nutrient and chlorophyll samples were also taken from the Niskin bottles, to be analysed in the lab. Nutrient samples were taken according to Tasmanian Environment Protection Agency (EPA) guidelines (Ford 2021, p. 6 – 18). For total nutrient concentrations, one 30mL tube was filled from each Niskin bottle (3 tubes per sampling station), leaving 5mL of head space. The same process was followed for dissolved nutrient concentrations, however the samples were filtered through syringe filter first. Both total and dissolved nutrient samples were immediately placed on ice in an esky. For chlorophyll samples, one 500mL sample bottle was filled from each Niskin bottle (3 bottles per sampling station). The contents of the sample bottle were immediately filtered onto GFF filter paper. Each filter paper was then immediately individually wrapped in foil and stored on ice in an esky. At each site, a plankton net with 20 micrometre mesh was deployed by hand to five metres, then immediately pulled back up. A subsample from the contents of the net was placed onto a microscope slide counting grid, then viewed under an optical microscope. Counts of both total plankton cells and Gymnodinium catenatum cells only were made by two different researchers and average count was recorded. A Secchi disk was also deployed twice at each site, by two different researchers. The mean Secchi depth was recorded for each site. Nutrient and chlorophyll concentrations were measured in the lab. The nutrient samples were analysed at CSIRO laboratories, according to the method of Rees et. al. (2018, pp. 25 – 40). Both total and dissolved concentrations of ammonia, NOx, nitrite, phosphate and silicate were measured using a segmented flow analyser (Rees et. al. 2018, pp. 25 – 40). Chlorophyll concentration was measured in the IMAS laboratory by KSA324 students, according to the method of Yentsch and Menzel (1963, pp. 221 – 231). The fluorescence was measured via acidification using a Trilogy fluorometer, with 90% acetone as the extraction solvent (Yentsch and Menzel 1963, pp. 221 – 231). Using Matlab, depth, density, practical salinity, absolute salinity and conservative temperature were derived from the in-situ measurements taken. Depth and density were derived from pressure; practical salinity and absolute salinity derived from conductivity; and conservative temperature derived from in-situ temperature. Quality control was conducted on the entire dataset. Researchers manually checked measurements in the spreadsheet to ensure all values were roughly as expected. Log sheets were also examined for all notes relating to data quality. The ODV data quality flagging convention was used: 0 = good quality; 1 = unknown quality; 4 = questionable quality; 8 = bad quality. Empty cells were indicated by “NA”. References: Ford, W (Director for the Environment Protection Authority) 2021, Environmental Licence No. 9869/3, Environmental Licence under the Environmental Management and Pollution Control Act 1994, pp. 6 – 18. Rees, C et. al. 2019, ‘Methods for reproducible shipboard SFA nutrient measurement using RMNS and automated data processing’, Limnology and Oceanography: Methods, vol. 17, pp. 25 – 41. Yentsch S, Menzel W 1963, ‘A method for the determination of phytoplankton chlorophyll and phaeophytin by fluorescence’, Deep Sea Research, vol. 10, pp. 221 – 231.
Hierarchy level
Dataset
Hierarchy level
Dataset

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 19plus (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 19plus (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 19plus (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Derived from conductivity measured by SBE 19plus

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 43 dissolved oxygen (DO) sensor (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 18 pH sensor (Sea-Bird)

Platform

Identifier

Code
SBE 19plus (Sea-Bird)

Instrument

Identifier

Code
SBE 19plus (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
ECO Fluorometer (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 19plus (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
SBE 19plus (Sea-Bird)

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Derived from in-situ temperature measured by SBE 19plus

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
HQ 4300 Portable Multi-Meter

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
HQ 4300 Portable Multi-Meter

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
HQ 4300 Portable Multi-Meter

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Platform

Identifier

Code
SBE 55 ECO (Sea-Bird)

Instrument

Identifier

Code
Segmented flow analyzer

Metadata

Metadata identifier
urn:uuid/2ac57362-597c-4ecd-8c19-f7346b1c1e22

Language
English
Character encoding
UTF8

Distributor

IMAS Data Manager - Data Officer
Institute for Marine and Antarctic Studies
Private Bag 129
Hobart
Tasmania
7001
Australia
Institute for Marine and Antarctic Studies (IMAS) website >

Type of resource

Resource scope
Dataset
Name
IMAS Dataset level record
Metadata linkage
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/2ac57362-597c-4ecd-8c19-f7346b1c1e22

Point of truth URL of this metadata record

Date info (Creation)
2023-04-17T00:00:00
Date info (Revision)
2025-07-07T16:04:04

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

Spatial extent

N
S
E
W


Keywords

Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
Marine and Estuarine Ecology (incl. Marine Ichthyology)
Global Change Master Directory Earth Science Keywords, Version 8.5
EARTH SCIENCE | AGRICULTURE | AGRICULTURAL AQUATIC SCIENCES | AQUACULTURE EARTH SCIENCE | AGRICULTURE | AGRICULTURAL AQUATIC SCIENCES | FISHERIES EARTH SCIENCE | OCEANS | WATER QUALITY

Provided by

Share on social sites

Access to the record in catalogue

Associated resources

Not available