🦈Bonnethead
窄头双髻鲨（学名：Sphyrna tiburo）为双髻鲨科双髻鲨属的鱼类。分布于大西洋和太平洋热带和亚热带各海区。该物种的模式产地在美洲。 2007年5月，科學家發現：窄頭雙髻鯊可以透過單性生殖進行無性生殖，雌鯊可以透過將自身的卵細胞與極體結合來形成受精卵。窄頭雙髻鯊為最早發現有這項行為的鯊魚。
Text: Wikipedia, CC BY-SA 4.0.
IUCN Red List assessment, 2021.
- Body mass
- 5.94 kg
- Body length
- 0.8 m
- Shoulder height
- not recorded
- Top speed
- not recorded
- Bite force
- not recorded
- Maximum lifespan
- 6.5 years
Everything we know about the Bonnethead
Typical adult figures. Where a value is an estimate rather than a measurement, it says so.
Body mass5.94 kgrecord 11 kg · FishBaseAnAgeDetails ↓Hide ↑
data quality: acceptable
Record: largest individual on record
Source: AnAge · AnAge build 15, 2023-07-03 (HAGR) · CC BY 3.0
Body length0.8 mrecord 1.5 m · FishBasetypical adultFishBaseDetails ↓Hide ↑
Record: largest individual on record
Source: FishBase · v25.04 · CC BY-NC 4.0
Maximum lifespan6.5 yearsrecord 12 years · FishBaseAnAgeDetails ↓Hide ↑
data quality: acceptable
Record: largest individual on record
Source: AnAge · AnAge build 15, 2023-07-03 (HAGR) · CC BY 3.0
Litter sizeabout 10AnAgeDetails ↓Hide ↑
data quality: acceptable
Source: AnAge · AnAge build 15, 2023-07-03 (HAGR) · CC BY 3.0
Trophic level4FishBaseDetails ↓Hide ↑
Source: FishBase · v25.04, estimate table · CC BY-NC 4.0
DietcarnivoreaverageDetails ↓Hide ↑
From trophic level 4 (FishBase): <2.2 herbivore, 2.2–2.8 omnivore, >2.8 carnivore.
Danger to humansharmlessFishBaseDetails ↓Hide ↑
Source: FishBase · v25.04 · CC BY-NC 4.0
Volume l5.9 LaverageDetails ↓Hide ↑
Body mass at ~1.0 kg/L, the density of vertebrate tissue.
average = a mean across sexes or species in a group.
Not recorded for Bonnethead yet: shoulder height, top speed, bite force.
Family tree
- kingdomAnimalia
- ›phylumChordata
- ›classElasmobranchii
- ›orderCarcharhiniformes
- ›familySphyrnidae
- ›genusSphyrna
- ›speciesSphyrna tiburo
- superclassGnathostomata
- classSharks & rays · Chondrichthyes
- subclassElasmobranchii
- genusSphyrna
All 8 branches ↓Fewer branches ↑
- kingdomMetazoa
- phylumChordata
- subphylumCraniata
- subphylumVertebrata
- superclassGnathostomata
- classSharks & rays · Chondrichthyes
- subclassElasmobranchii
- genusSphyrna
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