গুীরহর (হ্যাগফিশ) (hagfishes) >
Myxiniformes (Hagfishes) >
Myxinidae (Hagfishes) > Eptatretinae
Etymology: Eptatretus: hepta (Gr.), seven; tretos (Gr.), perforated (i.e., with holes), referring to seven gill apertures on what would later be described as Homea banksii (=E. cirrhatus) [range within genus is 6-14 pairs of gill apertures] (See ETYFish); polytrema: poly- (Gr.), many; trema (Gr.), hole, referring to 16 gill apertures per side (See ETYFish).
More on author: Girard.
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক তলদেশ বিহারী; অ_ পরিযায়ী; গভীরতার পরিসীমা 10 - 350 m (Ref. 31276). Deep-water; 30°S - 42°S
Southeast Pacific: Chile (from Coquimbo to Puerto Montt, Ref. 34263).
আকৃতি / ওজন / Age
Maturity: Lm ? range ? - ? cm
Max length : 93.0 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 31276)
TBK: demerspelag.
Life cycle and mating behavior
পরিপক্কতা | প্রজনন | ডিম ছাড়া | ডিমসমূহ | ডিম্বধারন ক্ষমতা | শুককীট
Copulatory organ absent. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies (Ref. 51361 ).
Fernholm, B., 1998. Hagfish systematics. p. 33-44. In J.M. Jørgensen, J.P. Lomholt, R.E. Weber and H. Malte (eds.) The biology of hagfishes. Chapman & Hall, London. 578 p. (Ref. 31276)
IUCN Red List Status (Ref. 130435: Version 2024-1)
Threat to humans
Harmless
Human uses
মৎস্য: আকর্ষণবিহীণ
হাতিয়ার
Special reports
Download XML
ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 10.5 - 11.8, mean 11.1 °C (based on 8 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00211 - 0.00719), b=2.92 (2.74 - 3.10), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
ট্রফিক পর্যায়ে (Ref.
69278): 4.4 ±0.7 se; based on size and trophs of closest relatives
Generation time: 8.9 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
স্থিতিস্থাপক (Ref.
120179): নিম্ন/ , সর্বনিম্ন প্রজন দ্বিগুনের সময় ৪.৪-১৪ বৎসর (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): High vulnerability (62 of 100).
Nutrients (Ref.
124155): Calcium = 10.4 [2.7, 33.2] mg/100g; Iron = 0.333 [0.119, 0.906] mg/100g; Protein = 2.72 [0.00, 6.54] %; Omega3 = 0.259 [0.101, 0.676] g/100g; Selenium = 13.2 [3.9, 44.3] μg/100g; VitaminA = 9.6 [2.0, 44.9] μg/100g; Zinc = 0.307 [0.153, 0.589] mg/100g (wet weight);
