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Platichthys solemdali Momigliano, Denys, Jokinen & Merilä, 2018

Baltic flounder
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> Pleuronectiformes (Flatfishes) > Pleuronectidae (Righteye flounders) > Pleuronectinae
Etymology: Platichthys: Greek, platys = flat + Greek, ichthys = fish (Ref. 45335);  solemdali: Named for Per Solemdal (1941-2016), the first researcher to study the Baltic Sea flounder’s eggs and sperm in connection to salinity; he discovered that 'the specific gravity of the eggs is a fixed population characteristic which is almost unchangeable' (Solemdal, 1973), thus laying the foundations on which many subsequent studies on local adaptation and speciation of Baltic Sea marine fishes were built..

Issue
This species would be the result of the first colonization of the Baltic Sea at its opening, the ancestral population having colonized a seconfd time while Platichthys solemdali was already differentiated (Momigliano et al. 2018: Ref. 119386). Further genetic evidence is need to confirm this species, but life-traits evidence suggests that this population should be considered as separated stocks.

Environment: milieu / climate zone / depth range / distribution range 生態学

; 汽水性の 底生の; 深さの範囲 0 - 50 m (Ref. 119386). Temperate

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Northeast Atlantic: endemic to the Baltic Sea.

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 26.7 cm SL オス/雌雄の選別がない; (Ref. 119386); 21.4 cm SL (female)

簡単な記述 検索表 | 形態学 | 形態計測学

背鰭 (合計) : 46 - 59; 臀鰭: 35 - 41; 脊つい: 33 - 35. This species is distinguished from all its congeners by the following: differs from P. stellatus by the absence of stripes on the dorsal and anal fin rays (vs. presence); differs from P. flesus with more than 99.999% certainty using genotypes of at least three of the outlier loci which were genotyped in this study (Loci 886, 3599, and 1822), with dorsal-fin rays 46-59 (vs. 51-66) and anal-fin rays 35-41 (vs. 35-45). Reproductive traits (viz. egg morphology and buoyancy, as well as sperm physiology) are distinct diagnostic characters with eggs of P. solemdali become neutrally buoyant at salinities between 16 and 21.5 psu and are 0.99 ± 0.05 mm in diameter, whereas the eggs of P. flesus in the Baltic Sea are larger, 1.3-1.5 mm, and reach neutral buoyancy between 11 and 18 psu). Spermatozoa of P. solemdalis activate at minimum salinities between 2 and 4 psu (vs. required salinity above 10 psu for P. flesus) (Ref. 119386).

生物学     用語集 (例 epibenthic)

This demersal species has been reported to have adults reside in the archipelago and coastal areas throughout their lives undertaking only limited migrations between deeper wintering grounds and shallower spawning and feeding areas. It lives in brackish water of varying salinities at 0.5 to 50 m depth on soft and hard bottoms. It is a benthivore, feeding on various mussels and other benthic invertebrates from its postsettled juvenile stage. Spawning occurs in April to June in nearshore areas 5-20 m depth, preferred water temperature of around 8°C. Mature females are reported lay up to 2 million relatively small eggs after fertilization develop on the bottom, above stony, sandy, or vegetated substrates. Little is known about its larval phase, while early development and juvenile habitat use generally resembles the common features of flatfishes. There are no studies specifically done on age and length at maturity for demersal Baltic flounder. However, around Gotland in the central Baltic Sea (SD 28) where both P. flesus and P. solemdali species co-occur, female flounders recruit to the adult population and attain maturity around the age of 3 years (range: 2-5) at a length of 20-25 cm, while males often maturing earlier (2-3 years) than females (3-4 years) (Ref. 119386).

Life cycle and mating behavior Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生

主な参考文献 Upload your references | 参考文献 | コーディネーター : Amaoka, Kunio | 協力者

Momigliano, O., G.P.J. Denys, H. Jokinen and J. Merilä, 2018. Platichthys solemdali sp. nov. (Actinopterygii, Pleuronectiformes): a new flounder species from the Baltic Sea.. Front. Mar. Sci. 5:Art. 225:1-21. (Ref. 119386)

IUCNのレッドリストの状況は (Ref. 130435)


CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = No PD50 data   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.9   ±0.13 se; based on food items.
回復力 (Ref. 120179):  手段, 1.4年~4.4年の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (23 of 100).