Surface egg structure and early embryonic development of the Antarctic toothfish, Dissostichus mawsoni Norman 1937

The Antarctic toothfish ( Dissostichus mawsoni Norman 1937) is the largest notothenioid inhabiting high-latitude Antarctic waters, where it is an important fishery resource and plays a key ecological role at a high trophic level. Despite the considerable amount of data on D. mawsoni biology and dist...

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Bibliographic Details
Published in:Polar biology 2018-09, Vol.41 (9), p.1717-1724
Main Authors: Ghigliotti, Laura, Ferrando, Sara, Di Blasi, Davide, Carlig, Erica, Gallus, Lorenzo, Stevens, Darren, Vacchi, Marino, J Parker, Steven
Format: Article
Language:English
Subjects:
Biology
Biomedical and Life Sciences
Chorion
Desmodora mawsoni
Diagnostic systems
Dissostichus mawsoni
Duration
Ecology
Eggs
Embryogenesis
Embryonic development
Embryonic growth stage
Fertilization
Fisheries
Fishery resources
In vitro fertilization
Life cycle
Life cycle engineering
Life cycles
Life history
Life Sciences
Longline fishing
Microbiology
Oceanography
Original Paper
Plant Sciences
Polar waters
Spawning
Surveying
Surveys
Thickness
Trophic levels
Zoology
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Summary:The Antarctic toothfish ( Dissostichus mawsoni Norman 1937) is the largest notothenioid inhabiting high-latitude Antarctic waters, where it is an important fishery resource and plays a key ecological role at a high trophic level. Despite the considerable amount of data on D. mawsoni biology and distribution developed since the fishery began in 1997, crucial aspects of the life cycle, including spawning and early life history, remain undescribed. During the first winter longline survey to the northern Ross Sea region in 2016, ripe male and female D. mawsoni were collected for the first time, and in vitro fertilisation of eggs was performed. Here, we report on the first characterisation of D. mawsoni egg structure and initial embryonic development. The duration of the egg cleavage period was similar to that of other nototheniid species releasing pelagic eggs. The structural features of fertilised eggs, including chorion thickness and structure, support the hypothesis that eggs of D. mawsoni are pelagic. The data presented here contribute to the description of the potential habitat of the eggs of this species, and provide the first diagnostic information to recognise the eggs of D. mawsoni .
ISSN:0722-4060
1432-2056
DOI:10.1007/s00300-018-2311-8