Gonadal maturation of the female smooth lumpsucker (Aptocyclus ventricosus)

Жукова, К. А.; Мазникова, О. А.; Орлов, А. М.

doi:10.7755/fb.116.2.4

Cited by 4 publications

(11 citation statements)

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“…Size-frequency analyses of oocytes revealed discontinuous oogenesis (determinate fecundity), group-synchronous ovarian organization (release of eggs once in the spawning season), and total spawning, following the classification of Murua and Saborido-Rey (2003). Similar reproductive strategies have been recorded for other representatives of Cyclopteridae, such as the smooth lumpsucker (Zhukova et al, 2018).…”

Section: Discussionsupporting

confidence: 56%

“…It is difficult, therefore, to determine if lumpsucker species feed during their entire life cycles. However, other representatives of Cyclopteridae, the Atlantic spiny lumpsucker, smooth lumpsucker, and lumpfish, can spawn several times during their life cycles (Cox and Anderson, 1922;Berge and Nahrgang, 2013;Zhukova et al, 2018).…”

Section: Fishery Bulletinmentioning

confidence: 99%

“…Lumpsucker species feed intensively throughout most of the year and have been reported to make diurnal vertical migrations in the water column to follow their main food item (hyperiids), and this movement pattern explains their regular presence in open water (Chuchukalo, 2006;Antonenko et al, 2009). The reproductive biology of Cyclopteridae has been previously examined in studies of the lumpfish (Cyclopterus lumpus) and smooth lumpsucker (Aptocyclus ventricosus) (Cox and Anderson, 1922;Davenport, 1985;Kennedy, 2018;Zhukova et al, 2018). Information on the reproductive processes of other members of Cyclopteridae is scarce and fragmented.…”

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confidence: 99%

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The first data on the diet and reproduction of Fedorov's lumpsucker (Eumicrotremus fedorovi)

Гордеев¹,

Жукова²,

Frenkel³

2021

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A total of 69 specimens of Fedorov's lumpsucker (Eumicrotremus fedorovi) caught on the continental shelf and slope of Simushir Island in the northwest Pacific Ocean were dissected and studied for stomach contents. The Fedorov's lumpsucker was found to feed mainly on the young of fish species, including the walleye pollock (Gadus chalcogrammus), northern lampfish (Stenobrachius leucopsarus), and northern smoothtongue (Leuroglossus schmidti), crustaceans, such as Themisto pacifica, Primno macropa, calanoids, gammarids, mysids, and caprellids, and squid. Histological analyses of ovaries revealed iteroparity, determinate fecundity, group-synchronous ovarian development, and total spawning. Testes were of an unrestricted lobular type. Chorion and thick zona radiata of Fedorov's lumpsucker correspond to the condition of eggs in specimens of other fish species that release demersal eggs. Absolute fecundity values of Fedorov's lumpsucker in our study were significantly less than those that have been reported for other species of Cyclopteridae. The results of this study provide the first data on this little known species of this family.

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Section: Discussionsupporting

confidence: 56%

Section: Fishery Bulletinmentioning

confidence: 99%

mentioning

confidence: 99%

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The first data on the diet and reproduction of Fedorov's lumpsucker (Eumicrotremus fedorovi)

Гордеев¹,

Жукова²,

Frenkel³

2021

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“…, Zhukova et al. ), which makes them accessible to AFSSLs in shallow waters and may account for the limited variation in diving behaviors observed across seasons. Although our results were inconsistent with studies that indicated maximum dive depths of wDPS AFSSLs during winter were greater than during summer (Merrick et al.…”

Section: Discussionmentioning

confidence: 99%

“…Otherwise, Pacific cod are most abundant on the continental shelf and tend to exhibit site fidelity (Bakkala 1984, possibly rendering them predictable prey for AFSSLs as well. During this time of year, smooth lumpsuckers also migrate from deep waters to nearshore areas to spawn at depths <10 m (Mecklenburg et al 2002, Zhukova et al 2018, which makes them accessible to AFSSLs in shallow waters and may account for the limited variation in diving behaviors observed across seasons. Although our results were inconsistent with studies that indicated maximum dive depths of wDPS AFSSLs during winter were greater than during summer (Merrick et al 1994, Merrick andLoughlin 1997), it is important to emphasize that seasons were not defined consistently across studies.…”

Section: Western Alaska Afssls (Western Dps)mentioning

confidence: 99%

Mixing it up in Alaska: Habitat use of adult female Steller sea lions reveals a variety of foraging strategies

et al. 2020

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From 2010 to 2015, satellite transmitters were deployed on 16 adult female Steller sea lions (AFSSLs; Eumetopias jubatus) in three regions of Alaska because there is limited information regarding the habitat use of this age class during winter and populations have yet to recover in western Alaska. Two approaches were used to assess how static (distance to shore, sea lion site, and continental shelf break, presence on/off the continental shelf, and bathymetric depth and slope), dynamic (proportion of daylight, fraction of lunar illumination, chlorophyll‐a, wind speed, sea surface height, eddy kinetic energy, and sea surface temperature), and other (region, distinct population segment, and season) covariates affected the habitat use of AFSSLs. Multimodel inference was first used to examine diving behaviors (mean and maximum dive depths, dive frequency) with respect to covariates using linear mixed‐effects models, whereas single model inference was used to examine kernel density estimates (KDEs) of individual monthly utilization distributions (n = 74) in western Alaska with respect to environmental covariates using generalized additive models. Additionally, weighted coefficients from these models were examined for the population as a whole, within each individual, between regions, and across monthly scales. Comparisons of foraging behaviors of AFSSLs over time and space revealed pronounced individual variability within overall broader patterns. Response variables of most models were related to various combinations of predictor variables, but distance to shore was the most influential variable across all models. As expected with a non‐migratory central place forager, frequency of diving and KDEs were greater on the shelf and near shore, though maximum dive depths increased with distance to shore. Interaction effects (proportion of day light*on/off shelf) observed for mean dive depths suggested AFSSLs were feeding on benthic species when in shelf waters near shore, whereas they were likely feeding on vertically migrating prey species while off‐shelf. Relationships regarding diving behaviors and KDEs of AFSSLs relative to dynamic oceanographic variables were not as prominent as those observed for static environmental variables, though some signals were apparent at different scales. Overall, static environmental features likely provided more consistent sources of habitat for prey resources, thereby making them more predictable for AFSSLs.

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WITHDRAWN: Reproductive biology of farmed lumpfishCyclopterus lumpus: Gonadal development and associated profiles of selected endocrine factors

Mlingi

Puvanendran

Burgerhout

et al. 2023

Preprint

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The demand for lumpfish (Cyclopterus lumpus) as a cleaner fish for the Atlantic salmon industry to battle sea lice infestations results in an increased interest of juvenile production in aquaculture. For successful control of the lumpfish reproduction, it is crucial to adequately understand its reproductive biology. Female and male lumpfish were sampled four times during a 24-week experiment where gonadal development in relation to endocrine factors was studied. Histologically, we identified and described ten oogenic and four spermatogenic stages during gamete development. The female gamete stages were grouped into ovarian development stages to simplify categorization of ovarian development. The ovarian development and the associated endocrine factors were typical for fish with group-synchronous ovarian organization, and from our histological observations it is possible that lumpfish females release up to four batches of eggs in one spawning season. During early stages of testis development, spermatogenic cells were observed in cysts. The cystic spermatogenesis and the distribution of spermatogonial cysts through the germinal compartment indicated an unrestricted spermatogonial distribution type. Despite its variance, the expression of genes gnrh2 and gnrh3 in the brain of lumpfish decreased in females and increased in males during gonadal development. Gonadal development was also associated with increasing trends of gene expression in gonadotropin receptors, vitellogenin receptors, steroidogenic enzymes, and blood plasma concentrations of sex steroids. The genes fshr, lhr, vtgr, cyp19a1 and the sex steroid E2 increased up to oocyte maturation and decreased at ovulation, while GSI, T and 11-KT increased up to ovulation. While fshr and lhr peaked at spermatocyte stage and decreased later, cyp17a1, T and 11-KT increased up to the spermatid stage and decreased at the spermatozoa stage in males. Our findings improve the current understanding on lumpfish reproductive biology and suggest future research directions.

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Gonadal maturation of the female smooth lumpsucker (Aptocyclus ventricosus)

Cited by 4 publications

References 10 publications

The first data on the diet and reproduction of Fedorov's lumpsucker (Eumicrotremus fedorovi)

The first data on the diet and reproduction of Fedorov's lumpsucker (Eumicrotremus fedorovi)

Mixing it up in Alaska: Habitat use of adult female Steller sea lions reveals a variety of foraging strategies

WITHDRAWN: Reproductive biology of farmed lumpfishCyclopterus lumpus: Gonadal development and associated profiles of selected endocrine factors

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