Schultze, Steve

English

Schultz, Steve

Aquatic Commons

S t a t e  of California - The Resources Agency 
Department of Fish and Game 
Marine Resources Region 
. Long Beach, California 
CRUISE REPORT 73-KB-31 ABALONE ,INVESTIGATIONS 
Prepared by Steve  Schu l t z  
Vessel  : KELP BASS 
Dates: November 15-20, 1973 
Local i ty :  China P o i n t  and Northwest Harbor, San Clemente I s l a n d  and 
Isthmus, C a t a l i n a  I s l a n d .  
Purpose: 1. To complete t h e  aba lone  popula t ion  survey t h a t  was 
i n i t i a t e d  dur ing  73-KB-29 (October 30, 31, 1973).  
2. To t a g  green  aba lone ,  HaZiotis fuzgens. 
Procedure: Inclement weather  prevented t h e  completion of t h e  abalone 
survey a t  China P o i n t .  However, good water  cond i t i ons  
e x i s t e d  c l o s e  .to sho re  i n  p ro t ec t ed  a r e a s  a l lowing  us  t o  
t a g  green  abalone a t  China Cove and Northwest Harbor. Dur- 
i n g  tagging  ope ra t ions  d i v e r s  brought t h e  aba lone  back t o  
t h e  KELP BASS where they were tagged,  measured ( l e n g t h  and 
width)  and then  r e tu rned  t o  t h e  r ee f  where they were picked.  
Reslflts:  B i o l o g i s t s  tagged and r e l e a s e d  1,363 green  aba lone  a t  two 
new s i t e s  i n  C'hina Cove (F igure  1, - S i t e  1.1 and 111) .  
Abalone r e l e a s e d  a t  S i t e  I1 t o t a l e d  413, w h i l e  S i t e  111 re-  
l e a s e s  t o t a l e d  425. Of t h e  838 tagged green  aba lone ,  20 
were e a t e n  by p r e d a t o r s  when rep laced  (10 by b a t  r a y s ,  
Mylobatis cali fornica, and 10 by o t h e r  f i s h ) .  An a d d i t i o n a l  
53 aba lone  t h a t  were c u t  by d i v e r s  dur ing  p ick ing  were n o t  
tagged o r  r ep l aced ,  b r ing ing  t h e  t o t a l  t agging  and handl ing  
m o r t a l i t i e s  t o  73 (8.2%).  
ang s t i c k  w>ed a t  ch ina  r o l n t  tagging  S i t e  1I.t 
e l i m i n a t e  a l a r g e  b a t  r a y ,  MyZiobatis cali fornica, f e e  
i n  t h e  tagging  s i t e .  It measured 4 f t  9 i nches  i n  wid th .  
Although t h i s  i s  l a r g e r  than  t h e  maximum width  r epo r t ed  f o r  
t h i s  s p e c i e s  (4 f t ) ,  we have observed l a r g e r  i n d i v i d u a l s  dur  
\ i n g  e a r l i e r  t r i p s  i n  t h i s  a r e a .  Its stomach conta ined  chunks\ 
ra l  aba lones  (no s h e l l ) .  
The green  abalone tagging  s i t e  a t  San Clemente I s l a n d  was 
e s t a b l i s h e d  a t  Northwest Harbor -(Figure 2 ) .  Due t o  inclement  
. weather  only  215 abalone were tagged and rep laced  a t  t h a t  
s i t e .  An a d d i t i o n a l  310 green  abalone picked and tagged a t  
Northwest Harbor were r e p l a n t e d  a t  t h e  Isthmus, Santa  Ca ta l ina  
I s l a n d  (F igure  3 ) .  A t o t a l  of 52 (9.1%) g reen  aba lone  was 
l o s t  t o  tagging and handl ing  m o r t a l i t i e s  a t  Northwest Harbor. 
Forty-four were n o t  tagged o r  r ep l aced  due t o  damage by 
d i v e r s  dur ing  p i ck ing .  Eight  were tagged aba lones  e a t e n  by 
.pf 'edators when rep laced  (1 by a b a t  r ay  and 8 by o t h e r  f i s h ) .  
Gonadal cond i t i on  of t h e  green aba lones  examined on t h i s  
c r u i s e  was poor.  Genera l ly  they .were  f l a c c i d  and spawned 
o u t ,  c o n t r a s t i n g  w i t h  the  f u l l ,  r i p e  cond i t i on  of t hose  
examined i n  June-July . 
Personnel :  Marco Mazarovich, Vessel  Captain 
Richard Burge, Biologis t- in-charge 
S teve  Schu l t z ,  B i o l o g i s t  
Jack Ames, B i o l o g i s t  
Robert Hardy, B i o l o g i s t  
Figures 1 & 2. Green abalone tagging s i t e s ,  San Clemente Island 
scale in yards 
FIGURE 1. 
I j i - 
. . Q 
r FIGURE 2. 
x =tagging s i t e s  
Figure 3. Green abalone tagging s i t e ,  Santa Cataline Island 


Cruise report 73-KB-31: abalone investigations

S t a t e  of California - The Resources Agency 
Department of Fish and Game 
Marine Resources Region 
. Long Beach, California 
CRUISE REPORT 73-KB-31 ABALONE INVESTIGATIONS 
Prepared by S teve  Schu l t z  
Vessel  : KELP BASS 
Dates: November 15-20, 1973 
L o c a l i t y  : China P o i n t  and Northwest Harbor,  San Clemente I s l a n d  and 
Isthmus, C a t a l i n a  I s l a n d .  
. Purpose: 1. To complete t h e ' a b a l o n e  popula t ion  survey t h a t  was 
i n i t i a t e d  dur ing  73-KB-29 (October 30, 31, 1973). 
2. To t a g  g reen  abalone,  HaZiotis fulgens. 
Procedure: Inclement  weather  prevented t h e  'completion of t h e  aba lone  
survey  a t  China Po in t .  However, good water  cond i t i ons  
e x i s t e d  c l o s e  t o  sho re  i n  p ro t ec t ed  a r e a s  al lowing us  t o  
t a g  green  abalone a t  China Cove and Northwest Harbor. Dur- 
i n g  tagging  opera t ion$  d i v e r s  brought t h e  aba lone  back t o  
t h e  HELP BASS where they  were tagged, measured ( l e n g t h  and 
width)  and then  r e tu rned  t o  t h e  r e e f  where they  were picked.  
Resu l t s  : ~ i o l o ~ i s t s  tagged and r e l e a s e d  1,363 green  aba lone  a t  two 
new s i t e s  i n  China Cove (F igure  1, - S i t e  I1 and 111) .  
Abalone r e l e a s e d  a t  S i t e  I1 t o t a l e d  413, w h i l e  S i t e  I11 re-  
l e a s e s  t o t a l e d  425. Of the .838  tagged green  aba lone ,  20 
were e a t e n  by p reda to r s  when rep laced  (10 by b a t  r a y s ,  
My Zobatis californica, and 10 by o t h e r  f i s h )  . An a d d i t i o n a l  
53 aba lone  t h a t  were c u t  by d i v e r s  dur ing  p i ck ing  were n o t  
tagged o r  r ep l aced ,  b r ing ing  t h e  t o t a l  t agging  and handl ing 
m o r t a l i t i e s  t o  73 (8.2%). 
A bang s t i c k  was used a t  China P o i n t  tagging  S i t e  I1 t o  
e l i m i n a t e  a l a r g e  b a t  r a y ,  MyZiobatis caZifornica, feeding  
i n  t h e  tagging  s i t e .  It measured 4 f t  9 i nches  i n  width.  
Although t h i s  i s  l a r g e r  than  t h e  maximum width  r epo r t ed  f o r  
t h i s  s p e c i e s  (4  f t ) ,  we have observed l a r g e r  i n d i v i d u a l s  dur- 
i n g  e a r l i e r  t r i p s  i n  t h i s  a r e a .  I ts  stomach conta ined  chunks 
of s e v e r a l  g reen  abalones (no s h e l l ) .  
The green  abalone tagging  s i t e  a t  San Clemente I s l a n d  was 
e s t a b l i s h e d  a t  Northwest Harbor (F igure  2 ) .  Due t o  inclement 
weather  on ly  215 abalone were tagged and rep laced  a t  t h a t  
si te.  An a d d i t i o n a l  310 green  abalone picked and tagged a t  
Northwest Harbor were r e p l a n t e d  a t  t h e  Isthmus, Santa  C a t a l i n a  
I s l a n d  (F igure  3) .  A t o t a l  of 52 (9.1%) green  abalone w a s  
l o s t  t o  tagging and handl ing  m o r t a l i t i e s  a t  Northwest Harbor. 
Forty-four  were n o t  tagged o r  r ep l aced  due t o  damage by 
d i v e r s  dur ing  p ick ing .  Eight  were tagged aba lones  e a t e n  by 
pf 'edators when rep laced  ( 1  by a b a t  r a y  and 8 by o t h e r  f i s h ) .  
Gonadal c o n d i t i o n  of t h e  green  aba lones  examined on t h i s  
c r u i s e  was poor.  Genera l ly  they  were f l a c c i d  and spawned 
o u t ,  c o n t r a s t i n g  w i t h  t h e  f u l l ,  r i p e  cond i t i on  of t hose  
examined i n  June-July. 
Personnel :  Marco Mazarovich, Vesse l  Capta in  
Richard Burge, Biologis t- in-charge 
S teve  Schu l t z ,  B i o l o g i s t  
J ack  Ames, B i o l o g i s t  
Robert Hardy, B i o l o g i s t  
Figures 1 Rr 2. Green abalone tagging s i t e s ,  San Clemente Island 
scale in yards 
FIGURE 1. 
. I  
! 
Q 
Northwest 
x = tagging s i tes  
Figure  3. Green abalone tagging site, Sznta Catalina Island 
scale i n  miles - 


Cruise Report 73-KB-31: Abalone investigations

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Cruise Report 73-KB-31: Abalone investigations

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