Landings in thousand tonnes

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

0 10 20 30 40 50 60 70 80 90

0 10 20 30 40 50 60

19 75 19 77 19 79 1981 1983 1985 1987 1989 1991 19 93 1995 199 7 1999 2001 200 3 2005 200 7 2009 20 11 2013 2015 2017

Percentage

Landings in thousand tonnes

India

Tamil Nadu

Percentage

(14)

0 2000 4000 6000 8000 10000 12000 14000 16000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 All India Tamil Nadu

Landings in tonnes

(15)

(16)

Tamil Nadu

Puducherry Andra Pradesh

Bay of Bengal Arabian

Sea

Indian Ocean

Odisha

West Bengal

Kerala Karnataka Maharashtra

Gujarat

Goa Maharasshtra M

ha

(17)

(18)

(19)

(20)

(21)

(22)

(23)

(24)

(25)

(26)

(27)

(28)

(29)

(30)

(31)

0 1000 2000 3000 4000 5000 6000

Tonnes

7000 8000 9000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Gill Net Trawl

0 1000 2000 3000 4000 5000 6000 7000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Landings (Tonnes)

Thanjavur (TN-9) Pudukko ai (TN-10) Ramanathapuram (TN-11)

(32)

(33)

(34)

1756

0.57 9.50

0 2 4 6 8 10 12 14

0 500 1000 1500 2000

Tonnes

2500 3000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Average Total Catch(t) CPH(Kg) CPUE (Kg)

0 200 400 600 800 1000

Tonnes

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Mandapam

Rameswaram

Soliakudi

Mallipattinam

Sethubavachatram

Ko aipa inam

Jagathapa inam

(35)

0 2 4 6 8 10 12 14 16

0 50 100 150 200 250 300 350 400 450 500

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Kilogram

Tonnes

Total Landings (t) CPH (Kg) CPU (Kg)

Tonnes Kilogram

0 2 4 6 8 10 12 14 16

0 200 400 600 800 1000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Landings (t) CPUE (kg) CPH(Kg)

0 1 2 3 4 5 6 7 8 9 10

10 20 30 40 50 60 70 80 90 100 110

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Landings (t)

Tonnes Kilogram

CPUE (kg) CPH(Kg)

(36)

0 2 4 6 8 10 12 14

0 50 100 150 200 250 300 350 400

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Landings (t)

CPUE (kg) CPH(Kg)

Tonnes Kilogram

0 2 4 6 8 10 12 14 16

0 50 100 150 200 250 300 350

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Landings (t)

CPUE (kg) CPH(Kg)

Tonnes Kilogram

0 5 10 15 20 25

0 20 40 60 80 100 120 140 160 180 200

Tonnes Kilogram

(37)

0 5 10 15 20 25 30

0 50 100 150 200 250 300 350

Tonnes Kilogram

0 10 20 30 40 50 60

0 100 200 300 400 500 600 700

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Tonnes

Total monthly Landings (2007-2017)

Monthly Total BSC Landing

Monthly Average BSC Landing

(38)

Bridle Wooden float Float

Stone Weight

Source: Prasad and Thampi (1952)

Stone Weight Load Weight

(39)

(40)

(41)

(42)

(43)

0 2 4 6 8 10 12 14 16

0 1000 2000 3000 4000 5000 6000 7000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Landing(t)

Tonnes Kilogram

CPH (Kg) CPU (Kg)

0 10 20 30 40 50 60 70 80 90 100

0 200 400 600 800 1000 1200 1400

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

percentage

tonnes

OBBSGN NMBSGN IBBSGN OBGN OBBSGN NMBSGN IBBSGN OBGN

(44)

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

0 5 10 15 20 25

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 IBBSGN (CPUE) NMBSGN(CPUE) OBBSGN(CPUE) OBGN(CPUE) IBBSGN (CPH) NMBSGN(CPH) OBBSGN(CPH) OBGN(CPH)

Kilogram Kilogram

0 10 20 30 40 50 60 70 80 90 100

0 500 1000 1500 2000 2500 3000 3500 4000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Total Landing

Percentage in all gears CPUE(Kg)

CPH (Kg)

Tonnes

(45)

0 10 20 30 40 50 60 70 80 90 100

0 500 1000 1500 2000 2500 3000 3500

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 OBBSGN (t)

OBGN (t) OBBSGN (%) OBGN (%)

Tonnes Percentage

0.00 0.50 1.00 1.50 2.00 2.50

0 5 10 15 20 25 30 35 40

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 OBBSGN (CPU Kg)

OBGN (CPU Kg) OBBSGN (CPH Kg)

OBGN (CPH Kg) Kilogram

Kilogram

(46)

(47)

(48)

(49)

0 20 40 60 80 100

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

% of all species of Crab % of BSC % of all other Spp.

0 10 20 30 40 50 60 70 80

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Average

Percentage

% OBBSGN %OBGN % OBTN

(50)

82 84 86 88 90 92 94 96 98 100

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Average P. pelagicus

Percentage

P. sanguinolentus

0 10 20 30 40 50 60 70 80 90 100

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Average

Percentage

IBBSGN NMBSGN OBBSGN OBGN OBTN

(51)

0 10 20 30 40 50 60 70 80 90 100

0 200 400 600 800 1000 1200 1400 1600 1800

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 P. pelagicus (t)

P. sanguinolentus (t) C. natator (t) P. pelagicus (%) P. sanguinolentus (%) C. natator (%)

Tonnes Percentage

0 20 40 60 80 100 120

IBBSGN NMBSGN OBBSGN OBGN

percentage

Gillnet

Crab Fish & other shellfish

(52)

0 50 100 150 200 250 300 350 400 450 500

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Tonnes

P.pelagicus P.sanguinolentus C.natator Calappa spp. Charybdis spp.

0 10 20 30 40 50 60 70 80 90 100

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 P. pelagicus P. sanguinolentus C. natator Calappa spp.

Charybdis spp.

Percentage

(53)

(54)

(55)

(56)

(57)

(58)

(59)

(60)

(61)

(62)

(63)

(64)

0 1000 2000 3000 4000 5000 6000 7000 2001

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

* Total includes BSC catches from Palk Bay, Gulf of Mannar, other areas of TN & Karwar

(65)

(66)

(67)

(68)

(69)

(70)

38.9 34.2

46.2 35.8

41.6 45.3

32.8 45.2

40.1

25.9

36.4 38.4

0 5 10 15 20 25 30 35 40 45 50

1995 1996 1997 1998 1999 2000 2007 2008 2009 2010 2012 Average

Percentage

(71)

14.8 10.6

18.4

21.4 2.6

2.6

11.7

0.0 5.0 10.0 15.0 20.0 25.0

1995 1996 1997 1998 2011 2012 Average

Percentage

0 10 20 30 40 50 60 70 80 90

Jan Feb Apr May Jun Jul Aug Sep Oct Nov Dec

Percentage

1996 1997 1998

1999 2007 2008

2009 2010 2012

Average

(72)

(73)

(74)

y =0.00000341

^L3.607

r = 0.9691 (n = 468)

0 100 200 300 400 500 600 700

75 100 125 150 175 200

Total Weight (g)

Carapace Width (mm)

(75)

y = 0.00002 L

^3.293

r = 0.9365 (n = 721)

0 100 200 300 400 500 600

75 100 125 150 175 200

Carapace Width (mm)

Total Weight (g)

y = 0.0006 L

^3.049

r = 0.9558 (n = 468)

0 100 200 300 400 500 600 700

30 40 50 60 70 80 90 100

Total W eight (g)

Carapace Length (mm)

(76)

y = 0.002 L

^2.774

r = 0.8965 (n = 721)

0 100 200 300 400 500 600

30 40 50 60 70 80 90

Total W eight (g)

Carapace Length (mm)

(77)

0 0 100 200 300 400 500 2040

6080 100120 140160 180

CW (mm)

0 2040 6080 100120140160180

CW (mm)

Days

⁰ ⁵⁰ ¹⁰⁰ ¹⁵⁰

Days

²⁰⁰ ²⁵⁰ ³⁰⁰ ³⁵⁰

Female

Observed

VBGF Observed

VBGF

Male

(78)

(79)

(80)

Months

Carapace width mm Male

Female

2 20 40 60 80 100 120 140 160 180 200

0 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36

(81)

0 73 83 93 103 113 123 133

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

73 83 93 103 113 123 133

Probability of capyure

Length Classes (mm)

Male L∞ - 199.40

M/K - 1.56

L∞ - 196.90 M/K - 1.39 Female

Probability of capyure

Length Classes (mm)

(82)

(83)

0 0 .5 1 1.5 2 2.5 3.5 4 3 4.5 5.5 6 5

0.25 0.5 0.75 1

Rel. Yield / recruit (10 ^ 2)

Exploitation rate

0 0 .1 .2 .3 .4 .7

.8 .91

.5 .6

.25 .5 .75 1

Rel. Biomass / recruit

Exploitation rate

0 0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5

0.25 0.5 0.75 1

Rel. Yield / recruit (10 ^ 2)

Exploitation rate

0 0 .1 .2 .4 .3 .7

.8 .9 1

.5 .6

.25 .5 .75 1

Rel. Biomass / recruit

Exploitation rate

(84)

7013

6783 6403 8454

7983 8319 8343

6681 6240

5172 4452 7360

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Tonnes

Total landings (t) MSY -7360 (t)

(85)

(86)

(87)

(88)

(89)

(90)

(91)

(92)

(93)

(94)

(95)

(96)

(97)

(98)

(99)

(100)