Life history strategies of the Scotia Sea icefish, Chaenocephalus aceratus, along the Southern Scotia Ridge

Riginella, Emilio; Mazzoldi, Carlotta; Ashford, Julian R.; Jones, Christopher D.; Morgan, Christina; Mesa, Mario La

doi:10.1007/s00300-015-1802-0

Cited by 11 publications

(6 citation statements)

References 46 publications

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“…The phylogenetically derived Channichthyidae have relatively large eggs and low fecundities, although the range of values is wide (Figure 4). Consistent with its large maximum size (67 cm) and geographic distribution exclusively in the southern Scotia Arc, C. aceratus has the greatest fecundity among channichthyids, producing ~7,000–25,000 relatively large oocytes (4.3–4.8 mm) per female (Kock, 1989; Kock & Kellermann, 1991; North & White, 1987; Novillo et al, 2019; Riginella et al., 2016). Three other species of large size ranging from 50–60 cm, C. hamatus , N. ionah and C. dewitti (in order of increasing size), have circum‐Antarctic distributions on the continental shelf and slope.…”

Section: Fecundity and Egg Sizementioning

confidence: 99%

Parental care and reproductive strategies in notothenioid fishes

Mesa¹,

Llompart

Riginella

et al. 2020

Fish and Fisheries

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The adoption of parental care behaviours is the distinctive reproductive characteristic associated with the diversification and divergence of notothenioid fishes into an array of habitats in the subzero shelf and upper slope waters around Antarctica and sub‐Antarctic environments. These include a variety of pre‐ and post‐fertilization activities, including courtship behaviour and mate choice, linked to the development of sexually dimorphic traits, nest construction and egg guarding until hatch. Using published literature and new data, this review synthesizes and evaluates, in a phylogenetic context, information related to parental care, specifically sex‐specific morphological adaptations, nest location and structure, sexual differences in egg guarding and post‐spawning mortality, duration of egg incubation times and larval size at hatch. The existence of parental care in phylogenetically basal notothenioids is not documented and unlikely; however, the derived lineages of the Antarctic clade (cryonotothenioids), especially bathydraconids and channichthyids, clearly exhibit a trend towards larger egg size and reduced fecundity that are considered proxies for parental care behaviours. In addition, the reproductive strategies of cryonotothenioids exhibiting parental care show latitudinal patterns at intra‐ and inter‐specific levels. Antarctic species spawn in spring‐summer and have low fecundity, large egg size at spawning and large larvae at hatching. Sub‐Antarctic species spawn in autumn‐winter and have moderate to high fecundity, moderate egg size and larval size at hatching, whereas non‐Antarctic species spawn in winter and possess high fecundity, small egg size at spawning and small larvae at hatching.

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Section: Fecundity and Egg Sizementioning

confidence: 99%

Parental care and reproductive strategies in notothenioid fishes

Mesa¹,

Llompart

Riginella

et al. 2020

Fish and Fisheries

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“…coriiceps eggs in our clutches after ovulation in seawater had a diameter of 4.93 6 0.09 mm (N ¼ 14) ( Fig. 1D), which is slightly larger than values reported previously (4.45-4.6 mm) (Kellerman, 1991;Sapota, 1999), and substantially larger than the diameters of eggs from some other Antarctic and sub-Antarctic notothenioids, such as Pleuragramma antarcticum (Antarctic silverfish, 2.0 mm) (Shust et al, 1984;Hubold, 1990;Koch and Kellerman, 1991;Bottaro et al, 2009), Gymnodraco acuticeps ('Naked' dragonfish, 3.4 mm) (Evans et al, 2005), Patagonotothen ramsayi (Patagonian rockcod, aka notothen, 2.2 mm) (Arkhipkin et al, 2013), Cottoperca gobio (Channel Bullhead blenny, 2.1-2.4 mm) (Arkhipkin et al, 2015), Chaenocephalus aceratus (Blackfin icefish, 3.0 or 3.7 mm) (Militelli et al, 2015;Riginella et al, 2016), Champsocephalus gunnari (mackerel icefish, 1.65 or 3.2 or 3.7 mm) (Kock, 1981;Duhamel et al, 1993;Militelli et al, 2015), Pseudochaenichthyes georgianus (3.0 mm,) (Militelli et al, 2015), and Dissostichus eleginoides (Patagonian toothfish, 4.5 mm) (Evseenko et al, 1995).…”

Section: Gametes and In Vitro Fertilizationmentioning

confidence: 99%

Embryogenesis and early skeletogenesis in the antarctic bullhead notothen, Notothenia coriiceps

Postlethwait

Yan

Desvignes

et al. 2016

Developmental Dynamics

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Background Environmental temperature influences rates of embryonic development, but a detailed staging series for vertebrate embryos developing in the sub-zero cold of Antarctic waters is not yet available from fertilization to hatching. Given projected warming of the Southern Ocean, it is imperative to establish a baseline to evaluate potential effects of changing climate on fish developmental dynamics. Results We studied the Bullhead notothen (Notothenia coriiceps), a notothenioid fish inhabiting waters between −1.9 and +2 °C. In vitro fertilization produced embryos that progressed through cleavage, epiboly, gastrulation, segmentation, organogenesis, and hatching. We compared morphogenesis spatially and temporally to zebrafish and medaka. Experimental animals hatched after about six months to early larval stages. To help understand skeletogenesis, we analyzed late embryos for expression of sox9, and runx2, which regulate chondrogenesis, osteogenesis, and eye development. Results revealed that, despite its prolonged developmental time course, N. coriiceps embryos developed similarly to those of other teleosts with large yolk cells. Conclusions Our studies set the stage for future molecular analyses of development in these extremophile fish. Results provide a foundation for understanding the impact of ocean warming on embryonic development and larval recruitment of notothenioid fish, which are key factors in the marine trophic system.

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“…The caught individuals of the Ch. aceratus, T. bernacchii, H. antarcticus and P. borchgrevinki were typical in size relative to this area and their range in general (Casaux et al, 2002;La Mesa et al, 2004;Reid et al, 2007;Riginella et al, 2016;Piacentino et al, 2018).…”

Section: Discussionmentioning

confidence: 87%

Allocation of the diet of the Argentine Islands’ inshore ichthyofauna

2021

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Fish diets are important indicators of ecosystem change. This aspect of the ichthyofauna of the coast of the Argentine Islands has been insufficiently studied in comparison with other regions. This article presents the results of comparison of dietary and somatic parameters of the dominant species Notothenia coriiceps depending on the point, depth and season of catch. The sample was collected between February 2006 and February 2007. In the year of study, N. coriiceps, Trematomus bernacchii, Chaenocephalus aceratus (common species), Harpagifer antarcticus and Pagothenia borchgrevinki (rare species in this region) were caught. The average fish size in this region does not differ from other places in the Southern Ocean. In Cornice Channel and Stella Creek, N. coriiceps was smaller than at other points due to the narrowness and shallow depth of these places. In winter, large individuals apparently migrated from the coast. The diet of N. coriiceps consisted mainly of crustaceans and seaweeds, with a small number of mollusks (especially limpets), which are common. The number of fish in the diet of N. coriiceps is relatively low for this region. Access to food was relatively the same at different points and depths of the catch. The lowest amount of food was in the fall, the highest amount of food was in the spring and summer. The condition and hepatosomatic index also did not change depending on the point and depth of the catch, but they were low in spring and high in summer. Perhaps this is due to the low energy value of food, which is not compensated by the amount. It is necessary to conduct studies of the diet of N. coriiceps in other years to clarify the specificity of fish in the diet and phenological changes in somatic parameters. Similar studies are needed for other species in the region if catches are sufficient to collect a representative sample.

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Life history strategies of the Scotia Sea icefish, Chaenocephalus aceratus, along the Southern Scotia Ridge

Cited by 11 publications

References 46 publications

Parental care and reproductive strategies in notothenioid fishes

Parental care and reproductive strategies in notothenioid fishes

Embryogenesis and early skeletogenesis in the antarctic bullhead notothen, Notothenia coriiceps

Allocation of the diet of the Argentine Islands’ inshore ichthyofauna

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