Common names:
6-gilled shark, Bluntnose sixgill shark, Morruna
Occurrence:
native
Salinity:
marine
Abundance:
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Importance:
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Aquaculture:
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Regulations:
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Uses:
no uses
Comments:
Landings (as target or by catch) at the Malta fish market from 2004 until 2008 totaled over 435 individuals, caught by fishermen with bottom longlines as the common gear used. Statistics show that 73% of the landed species were caught between January and April, with a peak in landings between February and March. The following were also observed: female proportion significantly larger than that of males; size of females between 74 cm and 400 cm (mean body length of 270 cm, st.dev. 63.5 cm), males between 106 cm and 356cm (mean body length of 246 cm, st.dev. 39.1cm); specimens collected in this study were mostly juveniles, only one record of a new born; no gravid female obtained. The above observation may indicate various regional scenarios: 1) fishing methods target immature individuals, 2) mature individuals absent in Central Mediterranean, or 3) the population has been exploited in a way that only immature specimens are left (since individuals reach sexual maturity quite late in their life-cycle) (Ref. 95706) Also Ref. 247.
National Checklist:
Country Information:
https://www.cia.gov/library/publications/resources/the-world-factbook/geos/mt.html
National Fisheries Authority:
Occurrences:
OccurrencesPoint map
Main Ref:
Lanfranco, G.G., 1996
National Database:
板鰓亜鋼(サメとエイ類) (sharks and rays) > Hexanchiformes (Frill and cow sharks) > Hexanchidae (Cow sharks)
Etymology: Hexanchus:hex (Gr.), six; anchus, etymology unclear, perhaps anchos (Gr.), choke or throttle, referring to how six gill openings of H. griseus extend down onto the throat. (See ETYFish); griseus:Medieval Latin for gray, reflecting the French vernacular “Le Griset,” referring to its dark-gray coloration. (See ETYFish). More on author: Bonnaterre.
Environment: milieu / climate zone / depth range / distribution range
生態学
