Estimating fecundity in the zygoparous species Helicolenus dactylopterus (Actinopterygii, Scorpaeniformes): adaptation of the gravimetric method

Sequeira, Vera; Neves, Ana; Vieira, Alberto; Paiva, Rafaela Barros; Canário, Adelino V.M.; Gordo, Leonel Serrano

doi:10.1007/s10750-015-2291-4

Cited by 4 publications

(10 citation statements)

References 36 publications

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“…Short‐term fluctuations in E 2 have been previous observed in multiple batch spawners (Takano et al ., ; Dahle et al ., ). Helicolenus dactylopterus is an asynchronous multiple spawner species (87 batches per season) with a short spawning interval (1·73 days) (Sequeira et al ., ) requiring continuous vitellogenesis during the spawning period to recruit new batches into maturity, which is consistent with the present results. Parallel changes for the two hormones have been shown in goldfish Carassius auratus (L. 1758) (Kobayashi et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…The histological analysis and the I G confirmed the spawning season of H. dactylopterus from January to May with a small delay compared with previous reports for the same geographic area (Sequeira et al ., 2012 a , 2015). Males had an out of phase and more extended active reproductive period than previously found (Muñoz et al ., ) lasting 8 months.…”

Section: Discussionmentioning

confidence: 99%

“…Advanced oocytes and embryos in spawning females were staged according to Grier () and Sequeira et al . (): secondary growth oocyte, full‐grown stage (SGfg), mature oocyte, eccentric germinal vesicle stage (OMegv), mature oocyte, germinal vesicle migration stage (OMgvm), mature oocyte, meiosis resumes stage (OMmr), fertilized (f), early celled (ec) and blastula (b). The universal terminology proposed by Brown‐Peterson et al .…”

Section: Methodsmentioning

confidence: 99%

“…It is an important commercial species in north-east Atlantic waters (c. 10 500 t average annual landings since 2006) as bycatch of demersal trawl and as target for longline fisheries (ICES, 2012). Female and male reproductive cycles are out of phase, with internal fertilization and storage of spermatozoa in cyst-like structures inside the ovaries for several months (Muñoz et al, 1999;Sequeira et al, 2012aSequeira et al, , 2015. Fecundity is relatively low highlighting the vulnerability of the species to the fishery.…”

Section: Introductionmentioning

confidence: 99%

“…Oocytes develop from the centre to the periphery of the ovary (Muñoz et al, 1999;Sequeira et al, 2012b). Multiple spawning of individual females occurs in the winter-early spring (Muñoz et al, 2010;Sequeira et al, 2012bSequeira et al, , 2015 and consists of early celled embryos (zygoparity) wrapped in a gelatinous matrix produced by the ovarian wall and peduncular epithelia (the structure that supports each oocyte) (Sequeira et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

Sequeira

Couto

Neves

et al. 2017

Journal of Fish Biology

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Two hundred and seven individuals (103 females and 104 males) of bluemouth Helicolenus dactylopterus (Scorpaeniformes, Sebastidae), a commercially important deep-water species with an unusual reproductive strategy, from the eastern Atlantic Ocean ranging from 13·9 to 37·5 cm total length (L ) were analysed from September 2011 to October 2012. The analysis included gonad maturity phases and blood-plasma levels of oestradiol-17β (E ), 11-ketotestosterone (11-KT) and 17,20β-dihydroxypregn-4-en-3-one (17,20β-P). Results confirmed the existence of an annual reproductive cycle with asynchrony between females and males and a spawning season from January to May. A pronounced peak in 17,20β-P in October for both sexes was associated with possible mating behaviour and recent copula. Levels of E increased preceding the elevation of the gonado-somatic index during ovarian growth and were lower during regression and regeneration. The frequency distribution of oocyte-embryonic stages and variation of hormone levels suggest the existence of daily rhythms. Fertilization was detected between 2000-0000 and 0800-1200 h and spawning took place throughout the day peaking between 2000 and 0000 h. The cyclic pattern of sex steroids and ovarian recruitment provides a new insight into the reproductive strategy of this species.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

Sequeira

Couto

Neves

et al. 2017

Journal of Fish Biology

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First in situ observations of the free-floating gelatinous matrix of blackbelly rosefish Helicolenus dactylopterus (Delaroche, 1809)

Ringvold¹,

Vesterinen

2021

Marine Biology Research

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Reproductive mode in Helicolenus dactylopterus has been debated since around 1900, and to our knowledge, no previous report on free floating egg mass of H. dactylopterus. Some authors claim viviparous strategy, others oviparous, or also that the species display a zygoparous or embryoparous form of oviparity. The most recent publications (ovarian studies) claim H. dactylopterus «definitely appears to be zygoparous», and due to «release of developing zygotes in the early phases of development», is zygoparous.We report on the first free floating, gelatinous egg mass matrix of Helicolenus dactylopterus, observed in situ. It was observed from Haganes pier, Bergen, Norway 10 April 2020, at 20 cm depth. Live eggs were mostly of the same size (~1 mm), and at late blastula stage. Pictures of live eggs from within the «Haganes matrix» is provided. Ethanol preserved eggs were obtained for DNA barcoding, employing sequences from the cytochrome c oxidase subunit I gene (COI). COI showed 100% similarity with sequences of adult blackbelly rosefish, H. dactylopterus. The species is previously known for internal fertilization, and the in situ observation of the Haganes matrix, with embryos at late blastula stage, is confirming theories of a zygoparous strategy.

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Epigenetic age estimation in a long-lived, deepwater scorpionfish: insights into epigenetic clock development

Weber,

Fields,

Chamberlin

et al. 2024

Can. J. Fish. Aquat. Sci.

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Age estimates are essential for fisheries assessment and management, but deepwater (>200 m) fishes are often difficult to age using traditional techniques. Therefore, age-predictive epigenetic clocks were developed for a model deepwater reef fish, blackbelly rosefish Helicolenus dactylopterus, using two tissue types (fin clips and muscle; n = 61 individuals; 9−60 years) and Δ14C-validated consensus age estimates. The influence of biological information (length and sex) on epigenetic clock accuracy, and the potential for developing a multi-tissue clock, were also assessed. Bisulfite-converted restriction site-associated DNA sequencing (bsRADseq) was used to identify CpG sites (cytosines followed by guanines) exhibiting age-correlated DNA methylation, and epigenetic clocks showed strong agreement (R2 > 0.98) between predicted and consensus ages. Including length and sex data enhanced accuracy and precision (R2 > 0.99; MAE < 1 year). Age-associated CpG sites were identified across tissues, but a multi-tissue clock performed poorly relative to single-tissue clocks. Overall, results demonstrate that accurate and precise epigenetic clocks can be developed for deepwater fishes, and the inclusion of biological information may enhance clock accuracy and precision.

show abstract

Estimating fecundity in the zygoparous species Helicolenus dactylopterus (Actinopterygii, Scorpaeniformes): adaptation of the gravimetric method

Cited by 4 publications

References 36 publications

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

First in situ observations of the free-floating gelatinous matrix of blackbelly rosefish Helicolenus dactylopterus (Delaroche, 1809)

Epigenetic age estimation in a long-lived, deepwater scorpionfish: insights into epigenetic clock development

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