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I I
I t t
INTRODUCTIOT{
T{ETHOI}S
RESULTS
Page
5
5
6
A )B )c )D )a )F )G )H )r )J )
K) ,r )M )
u)
Catch anal Ef for t Data 6l ' lean Size 7NuDber of Boats 7Folecast of 1972/73 Recru i tDent 7Int roaluct ion of Nev Legis ] .a t ion 7E f f e c t s o f N e r L e g i s l a t i o n 8Innovat ions to Boats anal cear 9Baf t gDist r ibut ion of F ish ing 1OAverage NuDber of Days l torked pe!boat per l to t th 10Pr ice of Rock Lobsters 10l tarket Trenals and EconoDic Factors 10Average i la lue per Pot on BoatTransferSea l la ter TeDperatures andS a l i n i t i e sSpawning Rock Lobste lsSex Rat ios
o )P )
1 1
1 1I 1T 2
IV
vD I SCUSS I0N
ACKNOWLEDGEI'IENTS
t 2
1 3
REFERENCES
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I .
PLATES
( C e n t ! e P a g e s )
A modern bont lwooal Rock Lobster Boat .
2 . An old le! type of carvel p lanket l Rock Lobster Boat
Rock Lobster Boat sbowing large tleck space atrdpot r inch
4 . A b a t t e n p o t .
5 .
6 .
A s i re beehive pot wi th bai t basket .
A loaal of cane beehive pots.
3 .
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II
;I
NOIIJNOOUIN I
I I I RESULTS
A . C a t c h a n d E f f o r t D a t a
l h e f i s h i n g s e a s o n e x t e n d s f r o n 1 5 N o v e m b e r t o 1 4 A u g u s ta n d m a y b e s u b d i v i t l e d i n t o t h r e e a l i s t i n c t p h a s e s v i z . ( i )t h e " w h j . t e s " f i s h e r y ( c e o l g e , 1 9 5 8 ) w h i c h b e g i n s s u d i l e n l yi n l a t e N o v e m b e r ( a s p a l e - c o ] . o u r e d n e w l y - m o u l t e d r o c kl o b s t e r s l e a v e t h e s h a l l o w r e e f a r e a s ) a n c l a r b i t r a r i l yf i n i s h e s o n 3 1 D e c e m b e r , ( i i ) t h e " c o a s t a l r e d " f i s h e r y ,whi -ch begins on 1 January and end,s on 14 August anal ( i i i )t h e A b r o l h o s I s l a n d s f i s h e r y w h i c h i s o p e n f r o n 1 5 M a r c hto 14 Augus. t .
t t L972 the "whi tes" run coumenced on about 23 November inb o t h n o r t h e r n a n d s o u t h e r n a r e a s w h i c h i s a b o u t t h e a v e r a g et i [ e b u t a f e w d a y s e a r l i e r t h a n t h e p r e v j . o u s s e a s o n .C a t c h e s a n t l e f f o r t ( i n n u m b e r o f p o t l i f t s ) w e r e a s f o l - 1 o w s :
"whi tes I ' catch" l { h i t e s " e f f o r t" C o a s t a l R e d s " c a t c h" C o a s t a l R e d s " e f f o r t =A b r o l h o s c a t c hA b r o l h o s e f f o r t
s , 8 8 7 , 5 O 0 l b s .2 , 5 3 5 , 6 0 0 p o t l i f t s .6 . 31f,9 oo rus .5 , 2 7 L ; 1 9 5 p o t I i f t s .2 ,1 t5 ,173 rbs .I , 3 2 9 , L 4 5 p o t l i f t s .
T o t a l C a t c hT o t a l E f f o r t
= L4,97c l )3 j tus.= 9 , 1 3 5 , 9 4 0 p o t l i f t s .
I h e s e f i g u l e s i n c l u d . e a s m a l l a B o u n t o f f i s h i n g i n e x t r e m en o r t h e ! n a n d s o u t h e ! D a r e a s a n d h e n c e c l i f f e r s l i g h t l y f r o nt h e f i g u r e s s h o w n i - n T a b l e s I a n d l 2 . A l s o , t h e s e f j - g u r e s d on o t i n c l u d e " c a s h " s a l - e s ( i . e . r o c k l o b s t e r s w h i c h a r e s o l a lf o r c a s h a n d a : c e n o t r e c o r d e t l i n t h e f i s h e r m a n ' s x n o n t h l yr e t u l n s o f c a t c h e s ) t o t a l l i n g a p p r o x . 1 , 0 0 0 , 0 O 0 l b s . , o ra m a t e u r c a t c h e s f o r w h i c h e s t i m a t e s h a v e s o f a r n o t b e e no b t a i n e a l . F i g u r e 1 s h o w s c o m p a r a t i v e c a t c h , e f f o r t a n dc a t c h p e r e f f o r t a l a t a f r o E p r e v i o u s y e a r s .
C a t c h a n d e f f o r t d a t a f r o m v a r i o u s s t a t i s t i c a l b l o c k s( F i g u t e 2 ) a r e s h o w n i n T a b l e I w i t h c a t c h e s e x p r e s s e d i - n
p o u n d s r r e i g h t a n d e f f o r t a s n u m b e r o f p o t l i f t s . T a b l e 2s h o \ r s c a t c h p e r p o t d a t a f o ! t h e s a m e s t a t i s t i c a l b l o c k s .U s i n g t h e m e t h o d o f c u l l a n a l ( 1 9 6 9 ) t o c a l c u l a t e e f f e c t i v ef i s h i n g i n t e n s i t y w i t h e a c h m o n t h ' s e f f o r t i n p o t l i f t s b e i n gw e i g h t e a l a c c o r d j . n g t o t h e l e l a t i v e c a t c h a b i l i t y i n t h a t
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I
2 .
6 .
A s f r o D 1 5 N o v e m b e r 1 9 7 2 , t h e e s c a P e g a P s i z e w a s
inc leased f rom 2 inches (51 m0) to 54 mm an' l the
escape gap had to a lso conply s i th sPeci f icat ions! e g a r a l i n g c o n s t r u c t i o n .
A s f r o m I F e b r u a r y l 9 ? 3 , t h e t a k i n g o f r o c k l o b s t e l s
b y m u l t i - n e c k e d P o t s w a s p r o h i b i t e d . T h i s r e g u l a t i o n
vas in t loduced in lesPonse to the increasing usage
of large, mul t i -necket l Pots sh ich sere found, to catch
m o r e e f f i c i e n t l y t h a n t h e c o m n o n l y u s e t l P o t s .
A s f l o m I J a n u a r y 1 9 7 3 , t h e m i l e c l o s u r e r e g u l a t i o n ,
rb ich prohib i te i l f ish ing wi th ln one n i le of the shore
a f t e r I i l a n u a r y e a c h y e a r ' w a s r e s c i n d e d . I t h a d
been agreed that ' wi th the in t roaluct ion of the larger
e s c a p e g a p , t h i s ! e g u l a t i o n , w h i c h w a s o r i g i n a l l yi n t r o d u c e d t o P r o t e c t t h e u n d e r s i z e r o c k ] . o b s t e r s i n
s h a l l o w v a t e r s , r t a s n o l o n g e r a p P r o P r i a t e .
A s f r o s r 4 M a y 1 9 7 3 , t h e t a k i n g o f r o c k l o b s t e r s b y
a n y p e r s o n ( a m a t e u r o ! p r o f e s s j - o n a l ) b y n e a n s o f
s p e a r g u n s , h a l P o o n s , I l a w a i i n s l i n g s , g i a l g j - e s a n d a l I
o thet pointed j .nst ruments r tas prohib i te t l . This was
i n t r o d u c e d i n o r d e r t o l i n i t t t r e e f f e c t i v e n e s s o f t h e
i n c r e a s i n g n u m b e r o f a m a t e u r f i s h e r m e n w h o w e r e t a k i n g
r o c k l o b s t e r s .5ev€rv MtcE gencq
Trro areas, one at eEEEEH and one at i tur ien Bay,
w e r e c l o s e d t o t h e t a k i n g o f r o c k l o b s t e r s a s t h e y
w e r e a r e a s i n \ t h i c h t h e c s l R o r e s e a r c h t e a m w a s c o n -
t l u c t i n g r e s e a ! c h u p o n j u v e n i l e r o c k l o b s t e r s .
I n f o r m a t i o n r e g a r t t i n g t h e s e c h a n g e s t o t h e l e g i s l a t i o n g o v e r n -
i n g t h e r o c k l o b s t e r f i s h e r y , a s w e I I a s t h e D e p a r t m e n t o f
F i i h e r i e s a n t l t l i l a t l i f e ' s p o l i c i e s o n v a r i o u s i s s u e s , m a y b e
f o u n d i n t h e f o l l o l t i n g v o l u m e s o f t h e F i s h i n g I n d u s t r y N e w s
s e r v i c e ( F . 1 . N . s . ) : - v o l . 4 ( 1 9 7 1 ) P p - 3 , 2 9 , 4 A ' 6 6 , 7 O '
v o 1 . 5 ( 1 9 7 2 ) p p - 2 , 3 , 2 0 , 3 0 , 3 1 ' 4 6 , 4 7 , 6 4 ' 6 6 , 7 L .
F . E f f e c t s o f N e r t L e g i s l a t i o n
D u r i n g t h e y e a r , t h e t \ r o m a j o r c h a n g e s i n t h e ] ' e g i s l a t i o ng o v e r n i n g t h e f i s h e r y m a d e w e r e :
t h e a b o l i t i o n o f t h e " n i 1 e l i n i t " ( 8 . 4 a b o v e ) a n d
t h e i n c r e a s e i n e s c a p e g a p s i z e ( 8 . 2 a b o v e )
4 -
i
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georgi .anuel and cat t le hocks, or herr ing and cat t le h i t les.sat -Bon (Anr ip is t "ut ta l heads decl ined in popular i ty due to
. t h e i n c r e a s i n g p r i c e a n d l o r e r e d a v a i l a b i l i t y . l l o w e v e r ,sa lmoD heads and hocks or sa lmon heads and cat t le h ide werest i1 l popular baj - t . o ther whole f ish sucb as Bony herr ing( F l u o i a l o s a o l a t n i . n g h i ) , n u 1 l e t ( I t l u g i , L e e p h a l u s ) , m u l i e sl S a r d i n o p s n e o p i l c h a r d u s ) , e t c . w e r e a l s o u s e a l i n b a j - tb a s k e t s . P i e c e s o f c a t t l e h i d e b e c a D e i n c r e a s i n g l y p o p u l a rdue maj-n ly to the Ior prJ-ce, reaaly avai lab i l i ty and goodl a s t i a g q u a l i t i e s .
I . D i s t r i b u t i o n o f F i s h i n g
T h e c l i s t r i b u t i o n o f f i s h i n g i s s h o w n i n f a b l e l . t h i sd e m o n s t l a t e s h o w , a s u s u a l , t h e m a j o r i t y o f e a r l y s e a s o nf ish ing (Novenber - December) was concentratec l in sha] . loww a t e r ( B l o c k s 2 8 1 4 , 2 9 ! 4 , 3 0 1 4 , 3 0 1 5 , 3 1 1 5 ) a n d h o w , p r o b a b l ya s a r e s u l t o f p o o r w e a t h e r c o n d i t i o n s , f j . s h i n g e f f o r t t l e -c l i n e d c o n s i d e r a b l y a f t e r . u a y i n a l l a r e a s .
J . A v e l a g e N u E b e t o f D a y s w o r k e d p e r b o a t p e r M o n t h
l"ton ttr N o v D e c J a n ! 'eb March Apr j - 1 Uay June Ju1y Aug
D a y sw o : r k c d f T . 5 2 4 . 7 1 5 . 6 1 6 . 1
T h e a v e r a g e n u m b e !s e a s o n w a s 1 6 . 2 .w a s a c o n t r i b u t i n ge f f o r t i i u r i n g J u n e ,
o f d a y s $ o r k e d p e r m o n t h f o r t h e L 9 7 2 / 7 3T h e b a d w e a t h e ! d u r i n g t h e w i n t e r m o n t h sf a c t o r t o t h e r e l a t i v e l v l o w l e v e l o f
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L 9 - 4 L 9 . 7 1 5 . 6 1 3 . 3 1 3 . 6 6 . 6
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A g a i n t h e m a j o r i t y ( 9 9 t ) o f t x o z e n r o c k l o b s t e r t a i l s w e r ee x p o r t e d t o t h e U . S . A . T h e d e m a n d f o r w h o l e r o c k l o b s t e ri n c r e a s e d s u b s t a n t i a l l y ( b y 1 5 7 c ) o v e r t h e p r e v i o u s y e a r w i t ht h e n a j o r i t y b e i n g e x p o r t e d t o F r a n c e ( 4 8 t ) a n a l J a p a n ( 3 o g ) .H o l d i n g s o f f r o z e n r o c k l o b s t e r t a i l s i n t h e u . s . A . d e c r e a s e ds I i g h t l y .
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80 DD at Jut ien Bay, 96 mm at l rancel iD and 95 ua at F lerant le .Suf f ic ient data on the propol t io ! o f breeal ing feDales totota l females above the qean s ize at f i rs t breeal ing ras nota v a i l a b l e f o r t t r e L 9 7 2 / 7 3 s e a s o n , b u t w i l 1 b e c o l l e c t e d l i Df u t u r e y e a r s .
sex Rat iosP .
The sex rat io of rock lobste ls taken by conDelc ia l pots r rascalcu lated f rom tbe iDformat ion gatheleal f roB the catchDoui to l ing progranme ancl is shown in Table 6. There wasu s u a l l y , b u t n o t a L u a y s , a n i n c r e a s e i n t h e p e r c e n t a g e o ff e n a l e s y i t h a l e p t h , p a r t i c u l a ! I y i n t h e D o n g a r a a r e a .
l v DI SCUSSTON
E o y e n a n d c t t i t t l e b o r o u g h ( 1 9 6 6 ) c a l c u l a t e d t h e s u s t a i n a b l el e v e l o f c a t c h f o ! t h e w e s t e r n r o c k l o b s t e r f i s h e r y t o b e1 6 r 0 0 0 , O 0 0 : 2 r O 0 0 , 0 0 0 l b s . p e r y e a r , a s s u m i n g t h a t r e c r u i t -Bent can be stabi l ized anal that the regulat ions in t roducedi n 1 9 6 3 s e r e e f f e c t i v e i n r e d u c i n g a n t l m a i n t a i n i n g t h e e f f o r ta t a n a c c e p t a b l e l - e v e l . D u r i n g t h e y e a r 1 9 7 2 / 7 3 t h e t o t a Lcatch was wi th i r i th is lange a l though i t was taken by ane f f o r t w h j - c h w a s s o m e 5 O t h i g h e r t h a n t h e L 9 6 4 / 6 5 l e v e l o fe f f o r t . B o w e v e ! , t h e e f f o l t i n L 9 7 2 / 7 3 s h o w e d s o n e d e c r e a s ef r o ] o t h e p r e v i o u s y e a r a n d i t n a y b e t h a t ' u n d e r t h e p r e s e n tr e g u l a t i o n s a n d e e o n o n i c c o n a l i t i o n s , n a x i n u m e f f o r t j - s n o wbeing expenateal by the f1eet .
T h e t r e n d t t o r a r d s i n c r e a s e d e f f i c i e n c y o f t h e f i s h i n g f l e e tc o n t i n u e d i - n I 9 7 2 / 7 3 , a l t h o u g h a r e t u r n t o a v e r a g e w e a t h e rc o n t l i t i o n s a f t e ! t h e e x t r e n e l y $ i l d s e a s o n i ^ L 9 7 L / 7 2 r e s u l t e dj .n the average number of boat days worked per month fa l l ings l i g h t L y . A l , s o , t h e e f f e c t j . v e 2 2 t * r e t l u c t i o n i n p r i c e , d u et o t h e d e v a l u a t i o n s a n d r e v a l u a t i o n s o f t h e A m e r i c a n a n dA u s t r a l i a n d b 1 1 a r , p r o b a b l y c o n t r i b u t e d t o t h i s f a 1 1 i n d a y sw o l k e d p e r m o n t h a s m a n y b o a t s s o u l d f i n d i t u n e c o n o $ i c a 1 t ow o r k a l u r i n g p e r i o d s o f 1 o w c a t c h r a t e .
l h e J , 9 7 2 / 7 3 s e a s o n w a s t h u s a l i t t l e b e l o w t h e a v e r a g e o fl e c e n t y e a r s s o f a r a s t o t a l c a t c h i s c o n c e r n e i l ( F i g u r e 1 )v i t h t h e c a u s e p r o b a b ] . y b e j - n g a c o m b i n a t i o n o f l o w e r e d r e c r u i t -m e n t a n d t h e c o n t i n u e a l a p p l i c a t j - o n o f g r e a t e r t h a n o p t i m a le f f o r t .
9-1 Sil\nd
--...-I
Plate 1. A modern bondwood Rock Lobsier Boat
An older type of carvel plankedRock lobsier Boal
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TabIe
catch/Effort Data for 1972/73 seasonin Vari-ous stat ist ical Blocks
BLOCK Nov Dec Jan Feb Mar Apri l- May June July Aug Tota I
26]2
2 613
27 L2
27 L3
27t4
28I2
2 813
2 814
29L2
29L3
29I4
3012
3 013
3014
3 01s
3112
3 t f3
3114
311-5
32L2
3213
32!4
32L5
3314
3 315
3 414
1 . 9 9
1 . 9 8
1 . 5 9
2 . 4 4
L . 6 2
2 . 7 4
1 . s 0
2 . 2 3
1 . 3 6
1 . r 5
L . 2 4
] . 5 4
| - 3 2
r . 0 5
r . oeu . I I
1 . 3 9
0 . 7 2
l .qsl .+o'
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, : 7
t - 69l . o o
"8i"12
1 . 1 4 1 . 5 8 r . 3 3
0 . 7 2 I . 5 7 r . 6 3
1 . 3 2 1 . 1 7 0 . 5 8
1 . 4 3 1 . 8 4 0 . 8 9
- I . 9 2 1 . 0 0
L . 6 7 2 . 0 7 L . O z
L . 5 2 4 . 2 0 2 - 7 7
l . 4 6 3 . 1 9 1 . 6 2
1 . 8 r 3 . 1 6 l . 4 1
1 . 6 6 3 . 0 7 1 . s 0
3 . 2 3 3 . 2 0 2 . s 0
2 . 3 3 - r . 7 9
L . 4 0 2 . 9 2 L . 6 8
L . S 5 3 . 4 2 L . 7 7
0 . 8 0
- t - . 2 1
1 . 2 0 1 . 8 5
0 . 9 5 1 . 2 1- 2 . 5 6
0 . 5 7 3 . 3 5
0 . 8 0 l - 4 2
1 . 1 3 2 . 6 7
r . 0 0 1 . 2 8
L . 6 2 0 . 9 8
0 . 88 l - . 19
1 . 0 5 L . L 2
1 . 1 0 L . L 7
1 . 1 0 1 . 4 3
r . 0 7 1 . 1 5
t . 2 5 L . L 2
1 . 3 0 1 . 1 6
0 . 7 8 1 . 7 1
L . 2 2 r . 1 l
L . 2 9 0 . 9 2
t - 5 3 0 - 9 7
0 . 4 3 0 . 7 5
- 1 . 3 0
2 - 4 9 2 . 2 2
2 . 2 8 2 . 8 1
r . 1 2 1 . 0 2
1 . 5 3 0 . 9 4
1 . 4 0 1 . 1 8
r . 3 0r . 2 t
r .63 t tsl '+5 l .3i
' l) l"+('l .ot+ 2-o]l.ot, I "Jl
"qb 2-o+'q7 t"+A- 7 7 1- 2 . 0 3
"87 l -b2'73 i.brt- 2 . 3 0
r . 8 3
1 . 3 9 0 . 9 7
1 . 1 1 1 . 0 r
r . 0 3- 0 . 3 4
0 . 7 8 0 . 8 0
r : o o 0 . 5 s
0 . 8 0
0 . 8 9 0 - 7 8
o . 8 2 0 . 8 r
0 . 3 3 0 . 3 4
0 . 7 1 I . 4 2
r . 4 4
l .+b .bq I.ao"13 t.qt l:77
4.8'l l . r ot. ( '31 . 0 0
r l o l o + l . %0 . 4 8
.fl
l J 8L . L 9 2 . 6 8 2 . 0 1
0 . 3 3 - r . 0 7
0 . 4 3 2 . 2 6 r . 5 0- 0 . 0 4 0 . 4 6
1 . 0 6 0 . 9 8
t - 6 6 2 . 6 2 L . 4 0 1 . 1 0 I . 6 7 L . 7 2 r . 2 8 l . 0 6 l . o g l . t 3TotaI
9 , 0 9 0 , 6 4 5 P o t l i f t s .Total Catch
Total Effort
l+,1'19,-?13 lle -
o<3oao
t I a l,.t!a P lroF. o ',iFCl
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3 o o.toP.A t5lDo !'ot-
o!,o
o an
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(n!,- lgP 'n t9
s Fr9' 15' F. qri IF O= |o vr3 !, lu
oo,P I!lo
l.-O
oorn I5t ocl
au !oo
I BEI(, P.oo otr
3 too !, l.l
q' P'
0'
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o
PqqB!3!tcrOZt F F lrio !, O !' O O q lJ5k H rr ttt o <
06{6{ {{t 6tN(h \O
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ro\ooro@lolt(,lt,t! {
6T
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r< o FoP'
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{{-JrlPrrr s{(I-J
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oQ
rr rJ{ {rarJ{ a(h U(rt,
(h \r { Or (n O!..r |Jt t} {,! \r
-.t -.t { -.t \r { ah \t {{t!@rrrroas!6t'ts
-r{\r-.J{{or{{(,!Er\),E!n|,liJur.A
\,t rl {
{
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{{
Table 4
catch per Pot (in nurnbers) of legal Size and undersize Rock
Lobsters for January and February in various ClePth categories
at Frenantle, Lancelin, Jurien Bay and Dongara for the L97L/72
and L972/73 Seasons.
Year 0-10 fathoms 10-20 fathons 20-30 fms 30+ fns
S rze u/s s ize u/s Size v/s s ize V/s
Frenant le 197I/72
r972 /7 3
l - . 8 0 . 0 4
1 . 1 0 . 0 2
1 . 0
0 . 8
1 . r0 . 7
tancel in* I97l /72
I972 /73 0 . 9 1 . 6 1 . 0 0
Jur ien Bay I97L/12
L972n3
. 1 . 5
0 . 8
3 . 10 - 7
r . 3 3 . 8 1 . 1 0 . 5 2 . 8
0 . 7 0 . 0 2
Dongara r97 t /72L972/73
0 . 9
0 . 5
3 . 5
3 . 2
0 . 9
0 . 2
4 . 4
1 . 4
r . 62 . 5
0 . 3 1 . 1 0 . 2
0 . 2 0 . 7 0 . 0 3
* Measurenents were not carried out in this area during the
I97L/72 season
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