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IS 15788 (2008): Fishing nets - Method of test for thedetermination of mesh size - Opening of mesh [TXD 18:Textile Materials for Marine-Fishing Purposes]

July 2008

IS 15788 : 2008

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Indian Standard

FISHING NETS - METHOD OF TESTFOR THE DETERMINATION OF MESH SIZE -

OPENING OF MESH

res 65.150

© BIS 2008

BUREAU OF INDIAN STANDARDSMANAK BHA VAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Price Group 2

Textile Materials for MarinelFish ing Purposes Secti onal Committee, TXD 18

FOREWORD

This Indian Standard was adopted by the Bureau of Indi an Stan dard s, after the draft fin alized by the Textil eMaterials for MarinelFishin g Purposes Sectional Committee had been app rove d by the Text ile Division Council.

This standard is based on ISO 16663-1: 2003 'Fishing nets - Method of tes t for the determination of mesh size -Part 1: Opening of mesh' .

In this standard Annex A is informative.

The composition of the Committee responsible for the for mulation of this standa rd is given in Ann ex B.

For the purpose of deciding whether a particu lar requ irem ent of this standard is complied with, the fin al value,observed or calculated, expressing the result of a test or analys is, shall be rounded off in accordance with IS 2 : 1960' Rules for rounding off num erical values (revised) ' . The number of significa nt places retained in the rou nded offvalue should be the same as that of the specified value in this standard.

IS 15788 : 2008

Indian Standard

FISHING NETS - METHOD OF TESTFOR THE DETERMINATION OF MESH SIZE -

OPENING OF MESH1 SCOPE 4 PRINCIPLE

This standard specifies a method for the determinationof size of opening of the mesh of fishing nets using aflat wedge gauge. It is applicable to active as well aspassive fishing gears.

2 REFERENCES

A flat wedge gauge is inserted perpendicularly to thenetting plane in the N-direction for knotted netting oralong the longest possible axis for knotless netting inaccordance with IS 4402, by applying a constant force.The mesh size corresponds to the graduation on thegauge .

3 TERMINOLOGY

4402 : 20051 Fishing nets - Netting - Basic termsISO 1107 : 2003 and definitions (second revision)

6359 : 1971 Method for conditioning of textiles

NOTE - In general a mobile fishing equipment (that is. mobilerelative to the ground or water column) led into the path of thefish to pursue and catch it. All trawls, dredges, seine nets, purseseines and other surrounding nets are examples of active gears.

For the purpose of this standard, the following termsand definitions shall apply.

3.1 Active Fishing Gear - A fishing gear requiringmovement to catch the fish.

5 APPARATUS

5.1 The mesh gauges shall be made of a non-corrosivemetallic alloy with a surface coating (see Fig. I).

The gauges shall be 2 mm thick, flat and shall have 2tapering edges with a taper of one to eight. They shallhave a hole at the narrow end. The edges of the gaugesshall be rounded with a radius of I rom.

5.2 Either printed or engraved markers ending 2 romfrom the edges shall be used. The scale shall begraduated at intervals of 1 mm, 5 mID and 10 mm. Nomarkers shall be used on the last 50 mm at the narrowend of the gauge.

5.3 Four sizes of gauge are required to cover the fullrange of mesh sizes:

a) Size from 10 nun to 70 mID,

b) Size from 60 mm to 120 mID.

c) Size from 110 mID to 170 mrn, and

d) Size from 150 mID to 250 rom.

TItleIS No.

The following standards contain provisions which,through reference in this text, constitute provisions ofthis standard. At the time of publication, the editionsindicated were valid.AIl standards are subject to revisionand parties to agreements based on this standard areencouraged to investigate the possibility ofapplying themost recent editions of the standards indicated below:

3.2 Danish Seine - Funnel -shaped net (with wingsand codend) with ropes set out on the sea bed andhauled to a vessel in the open sea.

3.3 Passive Fishing Gear - Fishing gear requiringaction of the fish to catch it.

NOTE - Mostly stationary often , bUI not always . are anchoredat the sea bed. Gill nets and entangling nets are examples ofpassive gears.

3.4 Purse Seine - Large single panel multi-sectionnet used to encircle shoaling fish, the bottom of whichis drawn together to enclose them.

3.5 Trawl - Towed net consisting of a cone-shapedbody, closed by a bag or codend extended at theopening by wings.

NOTE - Net may be towed by one or two boats and. accordingto the type. is used on the bottom or in mid water/or pelagic .

6 MEASURING FORCE

For netting of a mesh size of 50 rom or less, a forceequivalent to a mass of 2 kg shall be applied. For nettingof a mesh size above 50 mm up to 120 mID, a forceequivalent to a mass of 5 kg shall be applied and fornetting of a mesh size above 120 mm, a force equivalentto a mass of 8 kg shall be applied.

NOTE - This force can be applied by using a weightcorresponding to the mass described above or any other deviceas agreed between the interested parties .

7 REQUIREMENTS FOR TESTING

7.1 General

NOTE - Tests may be carried out in both Ihe dry and weIstales. but tests in the wet stale are considered to be particularlyappropriate in indicating the behaviour of the netting in use.

I

IS 15788 : 2008

7.2 Atmosphere for Testing

All specimens to be tested in the dry state shall beexposed to the standard atmosphere for testingspecified in IS 6359, until they have reachedequilibrium. Where it is not possible to carry out thetests in the standard atmosphere the tests shall becarried out immediately after removal of the samplesfrom the standard atmosphere.

7.3 Testing in the Wet State

Specimens to be tested in the wet state shall either be:

a) immersed in tap water of 20 ± 2°C for notless than 12 h; or

b) immersed in a solution of wetting agent at atemperature of 20 ± 2°C for not less than I h.

8 PROCEDURE

8.1 Straighten the netting in the N-direction for knottednetting and in the direction of the longest axis forknotless netting according to IS 4402.

8.2 Insert a gauge (see 5.1) by its narrow end into themesh opening perpendicular to stretched netting plane.

8.3 Insert the gauge into the mesh at its widest openingusing a measuring force (see 6) until it is stopped bythe resistance of the mesh.

8.4 Measure a minimum of 20 consecutive meshes.

8.5The size of each mesh shall bethe width of the gaugeat the point where the gauge is stopped, when using thisgauge in accordance with 8.1, 8.2 and 8.3. The widthshall be read at the top of the twine making sure that thesame readings are obtained at both edges of the gauge.

9 CALCULATION AND EXPRESSION OFRESULTS

Record the size of opening of the mesh in millimetresfor each measurement and calculate the average sizeof opening of the mesh rounded up to the nextmillimetre.

10 TEST REPORT

The test report shall include the following:

2

a) Description of the twine including thematerial and the type of yarn (twisted, orbraided), the type of netting (knotted orknotless), the mesh size, the nominal lineardensity of the twine as per IS 4402;

b) Average size of opening of the mesh inmillimetres;

c) Measuring force used;

d) Number of measurements;e) State of the netting (dry or wet);

f) Coefficient of variation and the confidenceinterval; and

g) Any deviation from the specified testprocedure.

C__)

FIG. I MESH GAUGE

IS 15788 : 2008

ANNEXA

(Foreword)(FOR INFORMATION ONLY)

METHOD SUITABLE FOR ALL ENVIRONMENTAL CONDITIONS

A-I The method of test for the determination of themesh opening is drawn upon Intemationallegislationfor the purpose of fisheries inspection [for exampleCommission Regulation (EEC) No. 129/2003 of 24January 2003 laying down detailed rules fordetermining the mesh size of fishing nets]. Recentlythe methodology using the flat wedge gauge has beenquestioned. The method is considered as notsufficiently precise and objective. especially whenusing hand force to operate the mesh gauge.

The present standard has taken account of the criticismtowards the wedge gauge by giving a more precisedescription of the mesh gauges and by using a weightonly to exert the measuring force. The method describedin the standard is appropriate for the determination ofthe mesh opening under controlled laboratoryconditionsbut it is considered as being less suitable for use at sea.

It is the intention to modify the present standard assoon as a method suitable for all environmentalconditions becomes available.

ANNEXB

(Foreword)

COMMITTEE COMPOSITION

Textile Materials for Marine/Fishing Purposes Sectional Committee, TXD 18

Organization Representativets)

Fisheries Development Commissioner, Ministry of Agriculture.New Delhi

Association of Indian Fishery Industries, New Delhi

Central Institute of Fisheries Nautical & Engineering Training.Cochin

Central Institute of Fisheries Technology, Cochin

SHRI M. K. R. NAIR (Chaimum)SHRI R. S. SISODIA (Alternate)

SHRI T. RAGHUNA11l REDDYDR C. BABU RAO (Alternate)

SHRI P. M. SALIM

DR B. MEENA KUMARISMT SAlY N. THOMAS (Alternate)

DR V. S. SOMVANSHISHRI M. E. JOHN (Alternate)

SHRI R. M. TElANGSHRI S. V. RAUT (Alternate)

SHRI M. K. UNNI KRISHNAN

DR P. P. PREMALA11lA

SHRI N. S. RAWATSHRI B. D. CHAlTERJI (Alternate)

SHRI N. SANTIlANANSHRI R. RAGHVENDRA SAYEE (Alternate)

MANAGING DIRECTOR

SHRI P. P. SURENDREN

SHRI K. J. M"TUNY

SHRI M. S. VERMA, Scientist 'F ' & Head (TXD )[Representing Director General (Ex-officio)1

Member Secretary

SHRI Axn, KUMARIoint Director (TXD), BIS

Fisheries Survey of India, Mumbai

Garware-Wall Ropes Ltd, Mumbai

Indian Fishnet Manufacturers Association , Chennai

Integrated Fisheries Project, Kochi

Office of the Textile Commissioner, Mumbai

SRFP Ltd, Chennai

The Karnataka Fisheries Development Corporation Ltd, Bangalore

The Kerala State Cooperative Federation for Fisheries DevelopmentLtd, Kochi

The Marine Products Export Development Authority, Kochi

BIS Directorate General

3

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Amendments are issued to standards as the.need arises on the basis of comments. Stand ards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that change s are needed, it is taken up for revision. Users of Indian Standard sshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of'BIS Catalogue' and 'Standards: Monthly Additions' .

This Indian Standard has been developed from Doc : No. TXD 18 (0853).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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