Microplastic concentrations in Sardinella maderensis, Sardinella aurita and Dentex angolensis from the Eastern Central Atlantic Ocean, off the coast of Ghana collected during 2019-04-06 (NCEI Accession 0289931)
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title: Microplastic concentrations in Sardinella maderensis, Sardinella aurita and Dentex angolensis from the Eastern Central Atlantic Ocean, off the coast of Ghana collected during 2019-04-06 (NCEI Accession 0289931)
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abstract: This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of counts of microplastics/individual fish) in the gastrointestinal tracts of three fish species; Sardinella maderensis (Madeiran sardine), Sardinella aurita (round sardine) and Dentex angolensis (Angolan Dentex) from the Eastern Central Atlantic Ocean, off the coast of Ghana collected during 2019-04-06. The fishes were caught with purse seine net. 155 fish specimens were obtained from 50 fishing boats at the Tema Fishing Harbor using a random sampling approach, where samples were taken from the first and fifth boats for every five boat landings. Total body length (cm) and body weight (g) were measured for each fish prior to dissection. This dataset contains the results of individual microplastic types from all 77 S. maderensis, 50 S. aurita and 28 D. angolensis samples, in a spreadsheet format.
purpose: These microplastic concentration data were collected in order to determine their abundance in Sardinella maderensis, Sardinella aurita and Dentex angolensis from the Eastern Central Atlantic Ocean, off the coast of Ghana during 2019-04-06
credit: Related Funding Agency: United Kingdom Global Challenges Research Fund (GCRF) - grant # GCRFNGR2/10334
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contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0289931/1.1
protocol: HTTPS
name: NCEI Accession 0289931 v1.1
description: published 2024-03-08T06:11:26Z
function: (CI_OnLineFunctionCode) download
role: (inapplicable)
processStep: (LE_ProcessStep)
description: NCEI Accession 0289931 was revised and v2.2 was published.
rationale: Updates were received for this dataset. These updates were copied into the data/0-data/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession.
dateTime:
DateTime: 2024-05-13T17:05:18Z
output: (LE_Source)
sourceCitation: (CI_Citation)
title: NCEI Accession 0289931 v2.2
date: (CI_Date)
date: (inapplicable)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
individualName: (inapplicable)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0289931/2.2
protocol: HTTPS
name: NCEI Accession 0289931 v2.2
description: published 2024-05-13T17:05:18Z
function: (CI_OnLineFunctionCode) download
role: (inapplicable)
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: Parameter or Variable: microplastic concentration (measured); Units: counts/individual; Observation Category: in situ; Sampling Instrument: Purse seine net; Sampling and Analyzing Method: This study investigated microplastics occurrence in fishes from the Guinea current region off Ghana's Coast. Fish specimens were obtained directly from landed boats at the Tema fishing harbor, Accra Ghana during April 2019. Fish samples (Sardinella maderensis, Sardinella aurita and Dentex angolensis) were collected from 50 fishing boats at the Tema Fishing Harbor using a random sampling approach, where samples were taken from the first and fifth boats for every five boat landings. A total of 155 fish specimen were obtained for microplastic analysis (n = 77, 50 and 28 for S. maderensis, S. aurita and D. angolensis respectively). Samples were transported on ice and kept frozen until they were ready for analysis at the wet laboratory of the Department of Marine and Fisheries Sciences and the Ecological Laboratory of the University of Ghana. In the laboratory, fish samples were cleaned in microplastic-free distilled water to remove any externally adhered plastic. Total body length (cm) and body weight (g) were measured for each fish prior to dissection. Condition factor (k) of the fish species were estimated from the relationship: K = 100 w/Lb: where W = weight of the fish in grams, L = total length of the fish in centimeters, b = the value obtained from the length-weight equation formula, W=aLb, where a =the intercept of the regression line on the Y axis, describing the rate of change of weight with length and b = the slope of the regression line (referred to as the allometric coefficient; b=3 in this study). The Condition Factor (K) allows quantitative comparison of the condition of individual fish within a population, individual fish from different populations, and two or more populations from different localities. Values of K ranging from 1.2 to 1.6 denote a fish in fair to excellent physiological condition. Whereas, value ranging 0.08 to 1 denote a fish in extremely poor to poor physiological condition. Fish species were dissected from the anal opening to the head region and their entire gastrointestinal tracts removed. The gastrointestinal tracts were exposed to 20 mL of 10 M Potassium hydroxide (KOH) at 60 °C for 24 h to ensure their complete digestion, leaving behind only plastic particles. Digested fluid samples were filtered through 1.2 μm Whatman GF/C microfiber filter papers and residues dried at 60 °C for 24 h prior to identification under the microscope. Identification of microplastics was carried out using a Leica EZ4 HD stereo microscope with image analyses system IC80 HD camera. Microplastic particles were counted, classified and categorized by type according to their shape into fibers or threads (elongated), fragments (angular and irregular pieces), film (thin and transparent) and their color (clear or green) following protocols outlined in the Spotter's Guide for identifying microplastics in Fish developed by the Civic Laboratory for Environmental Action Research.; Data Quality Method: Robust measures were put in place to reduce/avoid microplastic contamination from the working environment. These included maintaining a clean working station, depuration of fish under running filtered water, soaking dissection kits in ethanol between samples to prevent cross contamination, wearing cotton clothing throughout sample preparation and microscopy, setting up petri dishes containing dampened 1.2 μm Whatman GF/C microfiber filter papers during sample preparation and microscopy to account for airborne contamination and sealing digestion vials and petri dishes between laboratory sessions..
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
maintenanceNote: NCEI Accession 0289931 was revised and a new version of the archival package was published. Updates to existing archival packages may provide additional files or replace obsolete files. The latest version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession. Please see journal.txt in the /about directory for additional details on changes made.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: microscope
type: microscope
description: instrument is used in lab analyses A microscope is an instrument used to see objects that are too small for the naked eye.
