Egg buoyancy of flounder, Platichthys flesus , in the Baltic Sea—adaptation to salinity and implications for egg survival

Nissling, Anders; Nyberg, Sofia; Petereit, Christoph

doi:10.1016/j.fishres.2017.02.020

Cited by 31 publications

(27 citation statements)

References 48 publications

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“…In this study, spawning season lasted 5 weeks (August to September). Eggs and embryonic development of the speckled flounder are quite similar to those reported for other Pleuronectiforme species with slight differences in egg diameter as compared to Platichthys flesus (Nissling, Nyberg, & Petereit, ).…”

Section: Discussionsupporting

confidence: 78%

Early development and Juvenile Culture Technique of Speckled Flounder,Paralichthys woolmani(Jordan & Williams, 1897) under ambient seawater

et al. 2018

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Summary The speckled flounder Paralichthys woolmani is a flatfish species found in Ecuadorian coastal waters, consumed by local coastal communities and likely an excellent candidate for aquaculture production in indoor facilities. This study describes the early development and culture technique of P. woolmani under experimental conditions. Broodstocks were obtained from the wild and kept under laboratory conditions for this study. A total of four effective spontaneous spawns were registered at water temperature of 24.1°C, resulting in 1.3 million eggs and 129.2 thousand newly hatched larvae. Larval pelagic life lasted 28 days post hatch. Survival at benthic juvenile stage ranged 0.3%–46.9%. Pseudoalbinism was present in all juvenile batches. However, different pigmentation patterns in juveniles were recovered with addition of semi‐moist diet. There was no presence of ectoparasites or abnormal eye migration. At 370 days post hatch, flatfish reached 294.6 ± 86.9 g of body weight. These results can be of practical use for optimizing culture conditions to increase the yield of P. woolmani in captivity.

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Section: Discussionsupporting

confidence: 78%

Early development and Juvenile Culture Technique of Speckled Flounder,Paralichthys woolmani(Jordan & Williams, 1897) under ambient seawater

et al. 2018

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“…The main findings of different reproductive characteristics were later confirmed by the experiments and measurements by Nissling et al (2002Nissling et al ( , 2017. These studies revealed adaptations not only in egg size and buoyancy, but also in sperm physiology: the activation of sperm from pelagic flounders requires salinities of above 10 psu, while sperm from demersal flounders can be activated at salinities as low as 3 psu and maintains high motility at salinities encountered in the northern Baltic Sea (Nissling et al, 2002).…”

Section: Introductionmentioning

confidence: 64%

“…Confirmed individuals of P. solemdali sp. nov. have been sampled as far south as Öland (SD 27) (species identity confirmed via genetic analyses, Figure 1) and Hanö Bay (SD 25) (based on egg morphology, see Wallin, 2016;Nissling et al, 2017). In a recent paper Orio et al (2017) suggested that environmental conditions in the entire southern Baltic Sea are suitable for demersal spawning flounders, and already Mielck and Künne (1935) reported ripe female flounders with small eggs from shallow low-saline (6-7‰) areas in the southern Baltic Sea (Oder Data from demersal flounders from Nissling et al (2002) (SD 28, central Baltic) and from this study.…”

Section: Geographic Distributionmentioning

confidence: 99%

Platichthys solemdali sp. nov. (Actinopterygii, Pleuronectiformes): A New Flounder Species From the Baltic Sea

et al. 2018

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The European flounder Platichthys flesus (Linnaeus, 1758) displays two contrasting reproductive behaviors in the Baltic Sea: offshore spawning of pelagic eggs and coastal spawning of demersal eggs, a behavior observed exclusively in the Baltic Sea. Previous studies showed marked differences in behavioral, physiological, and life-history traits of flounders with pelagic and demersal eggs. Furthermore, a recent study demonstrated that flounders with pelagic and demersal eggs represent two reproductively isolated, parapatric species arising from two distinct colonization events from the same ancestral population. Using morphological data we first established that the syntypes on which the original description of P. flesus was based belong to the pelagic-spawning lineage. We then used a combination of morphological and physiological characters as well as genome-wide genetic data to describe flounders with demersal eggs as a new species:Platichthys solemdali sp. nov. The new species can be clearly distinguished from P. flesus based on egg morphology, egg and sperm physiology as well as via population genetic and phylogenetic analyses. While the two species do show some minor morphological differences in the number of anal and dorsal fin rays, no external morphological feature can be used to unambiguously identify individuals to species. Therefore, we developed a simple molecular diagnostic test able to unambiguously distinguish P. solemdali from P. flesus with a single PCR reaction, a tool that should be useful to fishery scientists and managers, as well as to ecologists studying these species.

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“…Estimates of RV calculated at bimonthly intervals for the period 1970–2005 were obtained from Figure in Ustups et al (), for each year in which sampled fish were born. The time of the year expected to be most important in determining flounders' spawning success and propagule survival is May–June, the period during which spawning and early development occur (Bagge, ; Hinrichsen et al, ; Nissling, Nyberg, & Petereit, ). However, environmental conditions in earlier months, when aggregation at spawning sites may start, could also be important: for example, hypoxic conditions could disturb aggregations of adult fish at spawning sites.…”

Section: Methodsmentioning

confidence: 99%

“…Estimates of RV calculated at bimonthly intervals for the period 1970-2005 were obtained from Figure 2 in Ustups et al (2013), for each year in which sampled fish were born. The time of the year expected to be most important in determining flounders' spawning success and propagule survival is May-June, the period during which spawning and early development occur(Bagge, 1981;Hinrichsen et al, 2017;Nissling, Nyberg, & Petereit, 2017).However, environmental conditions in earlier months, when aggregation at spawning sites may start, could also be important: for example, hypoxic conditions could disturb aggregations of adult fish at spawning sites. We therefore looked for a linear relationship between the percentage of P. flesus in the GoF and AS and the RV at and immediately after the time of spawning (May-June of the year of birth), as well as in the preceding (March-April) and following months (July-August), using major axis regression (reflective of the fact that both dependent and independent variables are measured with error).…”

mentioning

confidence: 99%

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Momigliano

Jokinen

Calboli

et al. 2019

Evolutionary Applications

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Unobserved diversity, such as undetected genetic structure or the presence of cryptic species, is of concern for the conservation and management of global biodiversity in the face of threatening anthropogenic processes. For instance, unobserved diversity can lead to overestimation of maximum sustainable yields and therefore to overharvesting of the more vulnerable stock components within unrecognized mixed‐stock fisheries. We used DNA from archival (otolith) samples to reconstruct the temporal (1976–2011) genetic makeup of two mixed‐stock flounder fisheries in the Åland Sea (AS) and the Gulf of Finland (GoF). Both fisheries have hitherto been managed as a single stock of European flounders ( Platichthys flesus ), but were recently revealed to target two closely related species: the pelagic‐spawning P. flesus and the newly described, demersal‐spawning P. solemdali . While the AS and GoF fisheries were assumed to consist exclusively of P. solemdali , P. flesus dominated the GoF flounder assemblage (87% of total) in 1983, had disappeared (0%) by 1993, and remained in low proportions (10%–11%) thereafter. In the AS, P. solemdali dominated throughout the sampling period (>70%), and P. flesus remained in very low proportions after 1983. The disappearance of P. flesus from the GoF coincides in time with a dramatic (~60%) decline in commercial landings and worsening environmental conditions in P. flesus’ northernmost spawning ground, the Eastern Gotland Basin, in the preceding 4–6 years. These results are compatible with the hypothesis that P. flesus in the GoF is a sink population relying on larval subsidies from southern spawning grounds and the cause of their disappearance is a cessation of larval supply. Our results highlight the importance of uncovering unobserved genetic diversity and studying spatiotemporal changes in the relative contribution of different stock components, as well as the underlying environmental causes, to manage marine resources in the age of rapid anthropogenic change.

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Egg buoyancy of flounder, Platichthys flesus , in the Baltic Sea—adaptation to salinity and implications for egg survival

Cited by 31 publications

References 48 publications

Early development and Juvenile Culture Technique of Speckled Flounder,Paralichthys woolmani(Jordan & Williams, 1897) under ambient seawater

Early development and Juvenile Culture Technique of Speckled Flounder,Paralichthys woolmani(Jordan & Williams, 1897) under ambient seawater

Platichthys solemdali sp. nov. (Actinopterygii, Pleuronectiformes): A New Flounder Species From the Baltic Sea

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

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