Summary of Large Basking Sharks Cetorhinus maximus (Gunnerus, 1765)


Photo/Date/Location Reference Sex TL (m) W (ton) PCL (m) Comments
  Zuffa et al. (2001)   2.49-12 70-2500 (for 8.5 m spec)   Table 1 summarizes basing shark records in the Atriatic Sea for 2000-2001. Length and mass is given for 5 sharks with condition factor (CF = M/TL^3) of 4.5, 5.8, 4.1, 4.5, and 4.1. Mean CF is 4.6 kg/m^3.
brugd45x3.jpg C. Stenberg pers. comm. M 2.92 ~90 kg   Slideshow of 2.92 m TL male juvenile basking shark caught in Porto Moniz (North-West coast of Madeira), on 29 Jan 2000.
Approximately 90 kg (we didn't have a scale, CF ~ 3.6); gonads 0.386 kg (GSI ~ 0.43%); liver 4.570 kg (HSI ~5%). Thanks to Charlott Stenberg.
1986-1999 Francis and Duffy (2002)   3.5-5.0 1.5-2.0  

A catch of 7 was supported by individual length (3.5-5.0 m) and mass estimated(1.5-2.0 t). Condition factor using lower and upper limits of length and mass range, respectively, yields 35.0 - 16.0. It suggests that mass or length estimate are suspect in view of CF that I caluclated from data given in Zuffa et al. (2001).

<1974 Ryan (1974)   5.0     Quoting from Francis and Duffy (2002): "Ryan (1994) reported a 5 m basking shark from Lake Ellesmere, a large, shallow brackish lake south fo Banks Peninsula, South Island New Zealand and in Sep 1979, multiple sharkswere observed in the same lake over a 1 week period, including 21 individuals on a single day (Dodgeshun 1980)."
1986-1999 Francis and Duffy (2002) 8 M, 6F 4.0-6.5     Greatest number (14) in one commercial tow from scientific observer record.

02 Sep 2002
Kelly Newton pers. comm.         Most recent basking shark sighting in Monterey Bay, Kelly Newton took the attached picture on Monday (02 Sep 2002) out in Monterey Bay. Along with the Basking Shark there were 4-5 blue whales and 2 humpback whales. From the plane (650 ft.) we could see it with its mouth open cruising through all of the krill.
BaskingSharkImages/baskingshark1.jpg
08 Aug 2007
posting to Elasmo-l by Sonja Fordham; additional information from Frederik Mollen F

6.86 TOT (stretched);
6.72 TL (caudal fin in natural position)

1.8 gutted; could not be verified 5.52

The Shark Alliance was on the scene for today's fish market display of a six meter, two-ton, female basking shark, landed illegally last night in Zeebrugge, Belgium. The shark was reportedly taken unintentionally by Belgian trawlers fishing in the Celtic Sea.

Necropsy pictures by Frederik Mollen

<1950 Matthews (1950) M 6.8     In north-eastern Atlantic, Matthews (1950) and Matthews and Parker (1950) observed a 6.8 m, maturing male basking shark, and matrue males of 7.6--8.1 m "in vigorous sexual activity" according to Francis and Duffy (2002).
05 Oct 2000
BaskingSharkImages/24basking1.jpg
Victor Lin p.c.   7.4     Found by Victor Lin on Web. 24' 4'' basking shark washed up on the Edmonds side of the Dennys river, Maine USA.
<1950 Matthews (1950) M 7.8-8.1     In north-eastern Atlantic, Matthews (1950) and Matthews and Parker (1950) observed a 6.8 m, maturing male basking shark, and matrue males of 7.6--8.1 m "in vigorous sexual activity" according to Francis and Duffy (2002).


Oct-Dec 1997

Francis and Duffy (2002)   7-8     Two commercial bottom trawlers caught 32 basking sharks on the seabed in depths of 200-300 m off Hawke Bay Nea Zealand. None were caught in the 10 years before and the year after.
<1950 Matthews (1950)   7.7-8.2     Matthews (1950) and Matthews and Parker (1950) considered five femalse of 7.7-8.2 m to be mature according to Francis and Duffy (2002).
BaskingSharkImages/tnBasking.jpg
5 May 2005;
Hualien, Eastern Taiwan
  M >8     They got a > 8m long male basking shark - sold and gone. Measurements and samples for DNA were taken by Sichu. Thanks for information to Shih-Chu Yang and John Y. Wang.
BaskingSharkImages/3500kgbasking.jpg
5 May, 2005
Victor Lin pers. comm. M 8.92 3700   same as above
BaskingSharkImages/basking_shark.jpg
April 2007
Victor Lin pers. comm.   9 (CF = 6.3) 4600   April 2007. Victor Lin saw on a Chinese website that Japanese fishermen caught a 9 meter, 4.6 ton basking shark. According to the news, it was the largest ever caught off Japan.
1889;
New Zealand
Cheeseman (1891)   10.43     Earliest published record of a basking shark caught in north-eastern New Zealand (36deg39'S, 174deg45'E) in 1889 according to Francis and Duffy (2002).
15 Mar 2001 Zuffa et al. (2001)   10-12     Group of some 10 specimens were sighted 12-13 miles off the coast. Harbour Office representitiv approached and photographed one individual.
06 Aug 1851 Evan Hodder pers. comm.   12.22     The largest reliably recorded basking shark probably an individual measuring 40ft 3in that was caught on August 6, 1851 in Musquash Harbor, Bay of Fundy, New Brunswick, Canada.
1931 Tomas (2004)   9.5 assuming CF = 4.6 ~3900   Caught by fisherman Thomas Machado in Monterey Bay in 1931. This "Basker" weighed 8600 lbs, including a liver weighing 2100 lbs.
BaskingSharkImages/DaliangChinaBasking.jpg
16 Aug 2001; Daliang, N.E. China
Victor Lin pers. comm.     4000   A 4000 kg basking shark caught at Daliang, N.E. China on 2001 Aug 16.
BaskingSharkImages/F200705240851341543019304.jpg
23 May 2007
Victor Lin pers. comm.   ~10 (CF would be 5.0) ~5000  

Five-ton blue shark captured in east China
A giant blue shark was captured by a fisher in east China's Jiangsu Province on the afternoon of May 23, 2007. The shark was10 meters long and 1.5 meters wide with a total weight of five tons or so. A businessman passing by purchased it at the price of over 100,000 yuan right after the capture.

21 Oct. 2004;
Taiwan
Victor Lin pers. comm.   ~15?
11.0 assuming CF = 4.6
6200   The news was reported to Victor Lin by a local fish dealer who called him the next day and said the bigger basking was about 6 tons. Vicotr then searched on the internet and found a brief account in of local newspapers that claimed the shark was 15 meters long and weighed 6 tons. They also reported that the shark was soon gutted and cut into pieces and no photo was available. The jaw of the shark was saved by a graduate student at a local university.

after 1948;
Monterey Bay CA, USA

Tomas (2004)   11.1 assuming CF=4.6 ~6350   Had largest liver (3500 lbs = 1588 kg) ever for a basking shark caught in Monterey Bay. Harpooned by Moss Landing fisherman Freeman "Whitey". Assuming liver was 25% of body mass, then this basking shark weighed about 6350 kg.
<2001     12.2-15.2     Compagno (2001, FAO cat.): "Basking sharks have been credited as reaching a maximum total length of 12.2 to 15.2 m, but even if this is correct, most specimens do not exceed approximately 9.8 m."
Photo/Date/Location Reference Sex TL (m) W (kg) FL (m) Comments



Created April 2004; updated June 2007. Back to previous page
Please send comments or corrections to mollet@pacbell.net