IS 15789: Textiles - Method of test for the determination of mesh size - Length of mesh

2008·2.9 MB·English

by  Bureau of Indian Standards

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IS 15789 (2008): Textiles - Method of test for the
determination of mesh size - Length of mesh [TXD 18:
Textile Materials for Marine-Fishing Purposes]
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IS 15789 : 2008
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Indian Standard
FISHING NETS - METHOD OF TEST FOR THE
DETERMINATION OF MESH SIZE - LENGTH OF MESH
res 65.150
© BIS2008
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

June 2008 PriceGroup2
TextileMaterials for FishingPurposesSectionalCommittee.TXD 18
FOREWORD
This Indian Standard was adopted by the Bureau ofIndian Standards. after the draft finalized by the Textile
Materials for FishingPurposesSectionalCommitteehad beenapprovedby the Textile Division Council.
Thisstandard isbased on ISO 16663-2:2003 'Fishingnets- Methodoftestfor the determi-nationofmesh size
- Part2:Length ofmesh'.
InthisstandardAnnex Aisinformative.
The compositionoftheCommitteeresponsiblefor the formulation ofthis standardis given inAnnexB.
Forthepurposeofdecidingwhetheraparticularrequirementofthis standard is compliedwith. the final value.
observedorcalculated.expressingtheresultofatestoranalysis.shallberoundedoffinaccordancewithIS2: 1960
'Rulesforroundingoffnumericalvalues(revisedy,Thenumberofsignificantplacesretainedintheroundedoff
valueshould bethesame asthat ofthe specifiedvalue in this standard.

•
IS 15789 :2008
Indian Standard
FISHING NETS - METHOD OF TEST FOR THE
DETERMINATION OF MESH SIZE - LENGTH OF MESH
ISCOPE NOTE- The fish gets entangled inthe inner small meshed
wallafter passing through theouter wallandpushthemselves
Thisstandardspecifiesamethodforthedetermination intothesecond outerwall.thus forminga pouch.
of mesh length of fishing nets using a ruler. It is
4PRINCIPLE
applicable topassive as well asactivefishing gears.
The netting, in both dry and wet states, is manually
2REFERENCES
straightened in the N-direction. The mesh length is
The following standards contain provisions which, measured with a ruler.
through referenceinthis text,constituteprovisionsof
5REQUIREMENTSFORTESTING
thisstandard.At the time ofpublication, the editions
indicated were valid. All standards are subject to
5.1AtmosphereforTesting
revision and parties to agreements based on this
standard are encouraged to investigatethe possibility All specimens to be tested in the dry state shall be
of applying the most recenteditions of the standards exposed to the standard atmosphere for testing
indicatedbelow: specified in IS 6359, until they have reached
equilibrium.
ISNo. TItle
NOTE- For netting of man-made fibres. a period of 24 h
4402: 2005/ Fishingnets- Netting- Basicterms exposure is generally sufficient. Where it is not possible to
ISOI 107:2003 and definitions (secondrevision) carryoutthetests inthestandardatmospherethetestsshallbe
6359 :1971 Methodforconditioningoftextiles carried out immediatelyafter removal of thesample fromthe
standard atmosphere-.
3TERMINOLOGY
5.2Testingin theWet State
For the purpose of this standard, the following
Specimenstobetested inthewetstate shalleitherbe:
definitions shall apply.
a) immersed in tap water of 20 ± 2°C for not
3.1Passive Fishing Gear- Fishing gearrequiring
less than 12h;or
action ofthe fish tocatchit.
b) immersed inasolutionofwettingagent at a
NOTE- Mostly stationary equipmentoften,but notalways. temperatureof20±2°C fornotlessthan Ih.
anchored at the seabed. Gill nets and entangling nets are
examples ofpassivegears. 6PROCEDURE
3.2ActiveFishingGear- A fishing gear requiring
6.1StraightenthenettingmanuallyintheN-direction.
movementtocatchthe fish.
Using aruler, thedistancefrom the first knot orjoint
NOTE- Ingeneralamobilefishingequipment(thatismobile inclusiveshall bemeasuredwithanaccuracyof Imm
relativetotheground orwatercolumn)ledintothepathofthe upto 10knot (exclusive)(see Fig. I).The meshlength
fishtopursueandcatchit.Alltrawls.dredges.seinenets,purse
isobtainedbydividing the measured length by5.
seinesandothersurroundingnetsareexamplesofactivegears.
6.2 At least 10 single measurements from different
3.3GillNet- Panelofnetting usuallyofrectangular
partsofnetting shall becarriedout. unlessotherwise
shape, made ofthin netting material in which fish is
agreed between the interested parties.
caughtinthe meshes.Thenet is suspendedvertically
inthe water byfloats and sinkers. XI-X-X-X-X-X-X-X-X-X-XI
NOTE~Thenet isheld vertically inthewater byfloats and FIG. I MEASURING THEMESH LENGTH
weights. forexample drift net.setgill net.
3.4 EntanglingNet - Looselyhungvertical net that 7 CALCULATION AND EXPRESSION OF
catchesfishbyentanglingratherthanenmeshing. RESULTS
3.5TrammelNet- Set/driftnet whichismade with 7.1 Record the size of opening of the mesh in
three walls ofnetting with two outer walls oflarger millimetres for each measurement and calculate the
mesh sizeand alooselyhung innernettingpanel. averagesize oflengthofmesh roundeduptothenext
millimetre.
IS15789:2008
7.2 Calculate the average size of mesh length material and the type of yarn (twisted, or
determinedin accordance with6 and rounded up to braided), the type of netting (knotted or
thenextmillimetre. knotless), the mesh size, the nominal linear
densityofthenettingmaterialasperIS4402;
7.3 Calculate the coefficient of variation and the
d) Average size of length of the mesh in
confidenceinterval.
millimetre;
8TEST REPORT e) Number of measurements;
Thetestreportshallincludethefollowing: f) Stateofthenetting (dry orwet);
g) Coefficient of variation and the confidence
a) Statement that the tests were performed in
interval;and
accordancewiththisIndianStandard;
h) Any deviation from the specified test
b) Dateofthetest;
procedure.
c) Description of the netting including the
ANNEXA
(Foreword)
METHODSUITABLEFORALL ENVIRONMENTALCONDITIONS
A-I Themethodof testfor thedetermination of the towards the wedge gauge by giving a more precise
meshopeningisdrawnuponInternational legislation description ofthemeshgauges andbyusingaweight
for the purpose of fisheries inspection [for example only to exert the measuring force. The method
CommissionRegulation (EEC) No. 129/2003 of 24 described in the standard is appropriate for the
January 2003 laying down detailed rules for determination of the mesh opening under controlled
determiningthemesh size of fishing nets]. Recently laboratoryconditionsbutitisconsidered asbeingless
themethodologyusingtheflatwedgegaugehasbeen suitableforuseatsea.
questioned. The method is considered as not
It is the intention to modify the present standard as
sufficiently precise and objective, especially when
soon as a method suitable for all environmental
usinghandforcetooperate themeshgauge.
conditions becomes available.
Thepresentstandardhastakenaccountofthecriticism

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IS 15789:2008
ANNEXB
(Foreword)
COMMITTEECOMPOSITION
Textile Materials forMarinelFishingPurposes Sectional Committee,TXD 18
Organization Representativets)
Fisheries Development Commissioner, Ministry of Agriculture. SHRI M. K. R. NAIR (CluJirmon)
NewDelhi SHRI R.S.SISODIA (Alternate)
Association of Indian Fishery Industries, New Delhi SHRI T. RAGHUNATH REDDY
DRC. BABURAo(Alternate)
Central Institute of Fisheries Nautical & Engineering Training, Cochin SHRI P.M. SALIM
Central Institute of Fisheries Technology, Cochin DRB. MEENA KUMARI
SHRIMATISALY N.THOMAS (Alternate)
Fisheries Surveyof India, Mumbai DRV. S. SOMVANSHI
SHRI M. E.JOHN (Alternate)
Garware-Wall Ropes LId. Mumbai SHRI R. M. TELANG
SHRI S.V. RAlJT (Alternate)
Indian Fishnet ManufacturersAssociation, Chennai SHRI M. K. UNNI KRISHNAN
Integrated Fisheries Project, Kochi DRP.P. PREMALATIlA
Office of the Textile Commissioner, Mumbai SHRI N. S. RAWAT
SHRI B. D. CHAITERJI (Alternate)
SRFP Ltd, Chennai SHRI N. SANTHAMN
SHRIR.RAGHVENDRA SAYEE(Alternate)
The Karnataka Fisheries Development Corporation Ltd, Bangalore MANAGING DIRECTOR
The Kerala Stale Cooperative Federation for Fisheries Develop SHRI P.P.SURENDREN
rnentLtd, Kochi
The Marine Products Export Development Authority, Kochi SHRI K.J. ANTONY
BIS Directorate General SHRI M. S.VERMA, Scientist 'F' & Head (TXD)
[Representing DirectorGeneral (Ex-officio)]
Membu Secretary
SHRIANIL KUMAR
Joint Director (TXD), BIS

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ThisIndianStandard hasbeen developedfromDoc :No. TXD 18(0854)
AmendmentsIssuedSince Publication
AmendNo. DateofIssue Text Affected
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