This afternoon, November 10, 1999, a juvenile male thresher shark, Alopias vulpinus, was landed in Guernsey. It was caught in gill nets about one mile south of Guernsey in about 20 metres (60 feet) of water. The shark contained remains of clupeoid fish in its mouth (probably sprats).
The following measurements were made.
Total length 175 cm
Fork length 98 cm
Tail length (from precaudal pit to tip) 92 cm
Snout tip to origin of D1 42 cm
Snout tip to precaudal pit 86 cm
Rear of D1 attachment to precaudal pit 32 cm
D1 rear attachment to origin D2 24 cm
D1 height 11.5 cm
Girth at origin of pectoral fins 54.5 cm
Girth at origin of D1 63 cm
Girth at origin of pelvic fins 53 cm
Interorbital distance (convex) 9.8 cm
The thresher shark was caught along with sea Bass, Red Mullet, pollack, plaice, a Seahorse (Hippocampus hippocampus) and a small Gilthead Sea Bream (Sparus aurata).
I will have the whole and gutted weight for the thresher shark shortly. The viscera are being saved for me. (I will have the viscera this evening if anyone wants them for study.)
Total weight: 16.55 kg
The Thresher Shark was caught about a third of a mile offshore. The capture was at 49° 24.8' N and 2° 36.85' W near rocks called Les Lieuses.
The viscera weighed 1759 grams. Gutted weight this morning was
confirmed as 14.80 kilograms. I spoke to the fisherman again this
morning. The whole weight appears to have been 16.5 kg and not 16.05
kg. It is possible that the whole weight was 16.55 kgs. This would
add up with the viscera weight (16.55 - 1.75 = 14.80 kg.). I weighed
two liver lobes (1013 grams), the stomach and spiral valve both full and
empty if you are interested in the information. There were a couple
of organs I couldn't identify. I will have photographs of these organs
and can email them to you when they are developed if you can help me identify
them. One of the organs looks like liver but it is a small two-lobed
affair that weighs 36 grams. The other organ I couldn't identify
is long and convoluted and weighs 19 grams. It is a dark reddish
colour. I will have to look at the photographs when they are developed
to remember what it was attached to. I saved visceral tissue in ethanol
for future studies if necessary.
Guernsey GY1 1BQ
The normal average weight seems to be between 150 & 200 lb
with small juveniles up to 70 lb not uncommon.
Two such juveniles were caught & released by an angling boat last week & I tagged & released a 200 lb female this weekend.