Annual cycle of stored spermatozoa within the ovaries of <i>Helicolenus dactylopterus dactylopterus</i> (Teleostei, Scorpaenidae)

Vila, Silvia; Muñoz, Marta; Sàbat, Maria; Casadevall, Margarida

doi:10.1111/j.1095-8649.2007.01525.x

Cited by 16 publications

(14 citation statements)

References 24 publications

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“…However, all cells remained discrete as evidenced by the lack of membrane fusion. More complex relationships are described in nonauchenipterid fishes (Vila et al, 2007).…”

Section: Discussionmentioning

confidence: 98%

“…Being functionally active, as indicated by a number of morphological characteristics (i.e., pronounced nuclear indentation, nucleoli and smooth endoplasmic reticulum), the epithelial cells in this study may participate in the nourishment of the inseminated spermatozoon. Adjacent lamellar epithelial cells are joined together by junctional complexes (this study) the function of which has been regarded as forming a barrier to protect the spermatozoa from the female immune system (Koya et al, 1997;Vila et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

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Spermatozoon and its relationship with the ovarian lamellae in the internally inseminating catfish Trachelyopterus galeatus

Parreira

Chiarini-Garcia

Melo

et al. 2009

Microscopy Res & Technique

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We examined the spermatozoa and their relationship with the ovarian lamellae in the catfish Trachelyopterus galeatus by classical light microscopy, high-resolution light microscopy, and transmission electron microscopy. Trachelyopterus galeatus is an internally inseminating species the spermatozoon of which presented an elongated cylindrical head (12.3 +/- 1.5 microm), elongated midpiece (5.0 +/- 0.7 microm), and flagellum (23.9 +/- 2.8 microm). Fertilized eggs or embryos were not found in its ovaries. Spermatozeugmata were demonstrated for the first time in this species. At the ultrastructural level, the anterior region of the head was devoid of chromatin with its shape being rounded with a hyaline tip in frontal sections and flattened in sagittal sections. The proximal centriole and most of the distal centriole were contained within a nuclear fossa. Mitochondria with lamellar cristae, as well as glycogen granules, were located just caudal to the nuclear fossa and distally in the midpiece. A single row of accessory microtubules ran peripherally in the midpiece. The flagellar axoneme had the typical 9 + 2 arrangement, having electron-dense and electron-lucent A-tubules at different points along the flagellum; flagellar fins were lacking. The ovarian lamellae were covered by a simple cuboidal epithelium. In maturing/mature females, spermatozoa were free in the ovarian lumen or inserted in pits of the lamellar epithelial cells. Tight junctions and desmosomes were seen between the epithelial cells. In addition to nourishment of the spermatozoon, the lamellar epithelial cells may play a role in protecting the spermatozoa against the female immune system.

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“…However, all cells remained discrete as evidenced by the lack of membrane fusion. More complex relationships are described in nonauchenipterid fishes (Vila et al, 2007).…”

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Spermatozoon and its relationship with the ovarian lamellae in the internally inseminating catfish Trachelyopterus galeatus

Parreira

Chiarini-Garcia

Melo

et al. 2009

Microscopy Res & Technique

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“…As for its reproductive biology, a previous study has shown that it is an ovo‐zygoparous species (Muñoz et al , 2002 a ), which implies a level of oviparity specialization. Fertilization is internal, and the female is able to store sperm in the ovary for long periods of time, within specialized interlamellar structures (Muñoz et al , 1999, 2000) where male sex cells are maintained in a viable state and protected from the female immune system (Muñoz et al , 2002 b ; Vila et al , 2007) until oocytes mature. Sperm is then released towards the ovarian lumen to fertilize the mature oocytes.…”

Section: Introductionmentioning

confidence: 99%

Female reproductive biology of the bluemouth Helicolenus dactylopterus dactylopterus: spawning and fecundity

Muñoz

Dimitriadis

Casadevall

et al. 2010

Journal of Fish Biology

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The bluemouth Helicolenus dactylopterus dactylopterus is a zygoparous species that spawns multiple batches of embryos enclosed within a gelatinous matrix. Oocyte development is asynchronous, and the recruitment of secondary growth oocytes occurs continuously during the developing phase, but stops before the start of the first spawning (i.e. fecundity is determinate). The number of developing oocytes can be estimated as a function of the total length of the fish, its ovary mass and its gonado-somatic index. Only at the onset of spawning, when potential fecundity is determined, does condition also have a significant effect. The low levels of atresia detected during most of the spawning season show that this mechanism does not substantially affect the process. There is variability both in the spawning interval (with a mean of 2 days) and in the number of embryos comprising every single batch (up to 37,000). Expected effect of fisheries on the reproductive traits of this deep-sea species is also discussed.

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“…The presence of empty cysts inside the ovaries during the spawning and post‐spawning periods is indicative of recent fertilization, as suggested by Vila et al . ().…”

Section: Discussionmentioning

confidence: 99%

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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Annual cycle of stored spermatozoa within the ovaries of Helicolenus dactylopterus dactylopterus (Teleostei, Scorpaenidae)

Cited by 16 publications

References 24 publications

Spermatozoon and its relationship with the ovarian lamellae in the internally inseminating catfish Trachelyopterus galeatus

Spermatozoon and its relationship with the ovarian lamellae in the internally inseminating catfish Trachelyopterus galeatus

Female reproductive biology of the bluemouth Helicolenus dactylopterus dactylopterus: spawning and fecundity

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus

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