Summary of Capture and Release Data of Sixgill Sharks, Hexanchus griseus

A slide titled "Collection and Size Records of Sixgill Sharks" was presented by Gilbert Van Dykhuizen at the 1993 AES meeting in Austin TX.

(Photograph included if ID is underlined), Condition factor CF = Mass/TL^3 in kg m-3.

kilroy.gif

ID, sex (name) Date captured Location Depth (m) Method TL(m)*/M(kg) when cap. Date released TL(m)*/M(kg) when rel. Days in captivity Release information, comments
1, F 11 Jun 86       1.04/5.9;
CF = 5.2		 died Aug 26, 86   ~70 died despite efforts to force feed
2, F (Bernadette) 05 Sep 86 Santa Cruz 92 Hook&Line 0.70/1.36;
CF = 4.0		 Sep 1987 1.05/5.7 (6/87);
CF = 4.9		 ~365 released (eye damage from cormorants)
3, M 27 May 1988 Carmel Canyon   Trawl 1.45/13.6;
CF = 4.5		       poor capture condition
4, M 16 Jun 1988 Big Sur   Trawl 2.34/59;
CF = 4.6		 removed 30 Jun 88   15 poor capture condition
5, M May 89 Big Sur   Trawl 2.35/68;
CF = 5.2		       poor capture condition
6, M (Bernie) 13 Jan 1992 Santa Cruz 55 Gill net 0.72/1.5:
CF = 4.0		 died 09 Aug 1993 1.21/11.0;
CF = 6.2
15 Jul 1993		 ~540 died for unknown reasons 3 weeks after routine measurements were taken
7, M (Case) 27 Feb 1992 Santa Cruz 55 Gill net 1.31 died Apr 12, 92

1.25TOT/5.5:
CF = 2.8
(D.E. data***)

 ~45 poor capture condition
8, F April 92 Monterey Bay       died Apr 17, 92 1.12TOT/4.0;
CF = 2.8
(D.E. data***)		    
9, M 04 Aug 1992 (rec. Aug. 7 from Steinhart) San Francisco Bay under Golden Gate 35 Hook&Line 0.99 died Aug 13, 92   ~10 presumed eaten by Octopus, one liver lobe was retrieved from surface on day shark was to be removed
10, F Oct 92 Monterey Bay       died Oct 92 0.688TOT/1.0 (D.E. data***).    
11, F (Bernice) 25 Jan 1993 Santa Cruz 55 Gil net 1.03/4.1 calc.
CF ~3.8
(5.0 kg on 7 Apr 1993) 		Jun 17, 93 1.05/3.77
CF = 3.3
24 May 1995		 ~170 fair capture condition, lost 1.23 kg in 47 days without feeding before release, tried B12 muscular injection
12, ? Apr 07, 93 2 miles off Long Marine Lab 55 Gil net juvenile, 1 of 4, all same size died 07 May 1993   30  
13, M Aug 26, 94 Moss Landing 20 Hook by Scubadiver 2.10/52.6;
CF = 5.7		 27 Aug 1994   2 found 200 g piece of marine mammal blubber floating in MBT
14, F Aug 26, 94 Moss Landing 20 Hook by Scubadiver 2.55/>91.6
CF > 5.5
(tipped scale)		 Sep 94     Released due to bouyancy problem
15, M, Bernardo Feb 14, 95 Davenport 55 Gill net 0.76/1.9
CF = 4.3		 Moved to quarantine 1.23/10.2;
CF = 5.5
05 Apr 1996		 ~400 tag# 14345
16, F Aug 23, 95 Moss Landing shallow Dragboat 0.80 died 07 Sep 1995   ~14  
ID, sex (name) Date captured Location Depth (m) Method TL(m)*/M(kg) when cap. Date released TL(m)*/M(kg) when rel. Days in captivity Release information, comments

*Over the curve measurement on live fish except TOT taken by Dave Ebert
*** Data taken by Dave Ebert assisted by Henry Mollet

Created Jan 1996, Revised: July 1996: HFM

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Please send comments or corrections to henry@elasmollet.org