Feeding habits of larval Maurolicus parvipinnis (Pisces: Sternoptychidae) in Patagonian fjords

Landaeta, Mauricio F.; Suárez-Donoso, Nicolás; Bustos, Carlos; Balbontín, Fernando

doi:10.1093/plankt/fbr081

Cited by 31 publications

(19 citation statements)

References 42 publications

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“…Chlorophyll a (Chl-a) ranges in this inner sea correspond to those values found for highly productive zones, such as coastal upwelling areas (0.05-30 mg Chl-a m −3 , Lara et al, 2010). In this area, large abundance of copepod eggs, nauplii and copepodite as well as the large water column stability in surface waters may promote larval feeding success (as it has been detected in other fish larvae of the region, Landaeta et al, 2011Landaeta et al, , 2013 and faster larval growth rates in Gadiform species that inhabit surface waters of Patagonian fjords (Castro et al, 2011).…”

Section: Introductionsupporting

confidence: 64%

Comparing early life traits of hakes from Chilean Patagonian fjords inferred by otolith microstructure analysis

et al. 2015

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Section: Introductionsupporting

confidence: 64%

Comparing early life traits of hakes from Chilean Patagonian fjords inferred by otolith microstructure analysis

et al. 2015

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“…Why does freshwater input appear to benefit larval growth rate in austral hake from this region? Large water stability in fjords ecosystems caused by freshwater discharges could have a potential benefit for larval hake in terms of predator-prey encounter rates and a subsequent increase of feeding success (large ingested prey volume, Landaeta et al, 2011). Additionally, hake larvae have a wide visual acuity from its early stages (Morote et al, 2011), aiming them to successfully capture prey at low light intensities in fjords and channels.…”

Section: __________________ Corresponding Editor: Guido Plazamentioning

confidence: 99%

Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis

Landaeta

Castillo-Hidalgo

Bustos

2018

lajar

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ABSTRACT. Austral hake Merluccius australis sustain an important demersal fishery in South Pacific and Atlantic oceans. The main spawning and nursery areas are in the Chilean Patagonia, which is characterized by large inputs of freshwater from rivers and ice melting. The spatial distribution of larval austral hake M. australis was studied during spring, and the potential effects of oceanographic conditions (temperature, salinity, vertical stability and turbidity) on early life traits, derived from sagitta otolith microstructure analysis, size-at-age (SAR), individual larval growth (IGR) and bilateral asymmetry (FA6). Larval abundance ranged between 0.86 and 41.55 ind 1000 m -3 (median: 4.08 ind 1000 m -3) and population larval growth estimated by micro-increment counts of sagitta otoliths was 0.129 ± 0.010 mm d -1 , with age varying from 4 to 24 days old. All three indicators derived from otolith analysis (SAR, IGR, and FA6) showed positive and significant correlations with vertical salinity gradients; IGR and FA6 were also positively correlated to Brunt-Väisälä frequency (vertical stability) and FA6 was correlated to turbidity. Therefore, larval M. australis were larger-at-age, grew faster and showed more asymmetry in areas with more influence of freshwater runoff in south Pacific Patagonia.

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“…Region-specific larger size-at-age has been linked to increased foraging success in a closely related species, Maurolicus parvipinnis, in Chilean waters (Landaeta et al 2015). In our case, this can indicate that prey availability was similar for the younger larvae, but a possible decrease in food supply may have occurred for the first cohort as they grew older and switched to other larger prey items (Landaeta et al 2011). Starvation as a direct source of mortality is typically only documented within the first few weeks after the onset of feeding (Hewitt et al 1985), and Leggett and Deblois (1994) concluded that neither Hjort's critical period hypothesis nor Cushing's match-mismatch hypothesis generally were main explanations of recruitment variations in marine fish.…”

Section: Biological Explanations For Differential Cohort Mortalitymentioning

confidence: 61%

“…Diet of first feeding Maurolicus larvae has elsewhere been shown to be dominated by copepod eggs and nauplii (Landaeta et al 2011(Landaeta et al , 2015. In the fjords of western Norway, advective processes may be more important than local population dynamics in determining available zooplankton (mainly copepod) biomass (Aksnes et al 1989), and in the nearby Masfjorden the biomass has varied both interannually and on shorter time scales by more than a factor of 10 (Giske et al 1991).…”

Section: Impact Of Hatch Date and Survival On Spawning Strategymentioning

confidence: 99%

Impact of hatch date on early life growth and survival of Mueller’s pearlside (Maurolicus muelleri) larvae and life-history consequences

Folkvord

Gundersen

Albretsen

et al. 2016

Can. J. Fish. Aquat. Sci.

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Growth and survival of Maurolicus muelleri larvae in Herdlefjorden, Norway, were investigated by daily otolith increment analysis. While high egg densities were generally observed throughout the spawning season, three cohorts each with a narrow window of hatching dates were identified. The first of these cohorts was characterized by low growth and poor morphometric condition and disappeared from the fjord during autumn. High-resolution drift modeling indicated that Herdlefjorden had a net export of larvae and negligible import in the period cohort 1 disappeared. Yet, the advective loss rate of larvae was not considered high enough to explain the near complete disappearance of the first cohort. An otolith-based growth chronology indicated that growth conditions in Herdlefjorden improved noticeably around mid-September and remained favorable the following month. The analysis of daily otolith increments could thus be used to document within-season variability in larval growth and survival. The low and variable survival due to short-term fluctuations in environmental conditions indicate that multiple batch spawning is an adequately evolved life-history strategy for marine planktivorous fish such as M. muelleri.Résumé : La croissance et la survie des larves de Maurolicus muelleri dans le Herdlefjorden (Norvège) ont été étudiées par l'analyse des incréments quotidiens d'otolithes. Si de fortes densités d'oeufs ont été généralement observées durant toute la saison de frai, trois cohortes ont néanmoins été identifiées, chacune présentant sa propre fourchette restreinte de dates d'éclosion. La première cohorte était caractérisée par une faible croissance et un faible embonpoint morphométrique et a disparue du fjord durant l'automne. La modélisation à haute résolution de la dérive indique que le Herdlefjorden présentait une exportation nette de larves et une importation négligeable dans la période durant laquelle la première cohorte a disparu. Le taux de perte de larves par advection n'est toutefois pas jugé assez élevé pour expliquer la disparition presque complète de la première cohorte. Une chronologie de la croissance reposant sur les otolithes indique que les conditions de croissance dans le Herdlefjorden se sont améliorées de manière marquée vers la mi-septembre et sont demeurées favorables le mois suivant. L'analyse des incréments quotidiens d'otolithes pourrait donc être utilisée pour documenter la variabilité au cours d'une même saison de la croissance et de la survie des larves. Une survie faible et variable causée par des fluctuations de courte durée des conditions ambiantes indique que frayer en plusieurs épisodes constitue une bonne stratégie d'évolution du cycle biologique pour les poissons marins planctonivores comme M. muelleri. [Traduit par la Rédaction]

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Feeding habits of larval Maurolicus parvipinnis (Pisces: Sternoptychidae) in Patagonian fjords

Cited by 31 publications

References 42 publications

Comparing early life traits of hakes from Chilean Patagonian fjords inferred by otolith microstructure analysis

Comparing early life traits of hakes from Chilean Patagonian fjords inferred by otolith microstructure analysis

Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis

Impact of hatch date on early life growth and survival of Mueller’s pearlside (Maurolicus muelleri) larvae and life-history consequences

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