Phosphorus metabolism and water uptake during final maturation of ovaries of teleosts with pelagic and demersal eggs

Craik, J.C.A.; Harvey, S. M.

doi:10.1007/bf00569140

Cited by 25 publications

(7 citation statements)

References 15 publications

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“…Rather, these fishes (L. bergylta and L. mixtus) continued sequestering yolk proteins during final maturation, and the concomitant hydration was relatively small. Although we cannot preclude that the PH ooc of L. bergylta were in a mid-vitellogenic phase, a continued protein sequestration is known to occur during the early phases of oocyte maturation (germinal vesicle migration) in other benthophils (Wallace & Selman 1985, Thorsen et al 1993, Tyler & Sumpter 1996, and the degree of hydration is similar to earlier reports on marine benthophils (Craik & Harvey 1986, Greeley et al 1986). Furthermore, the early phases of oocyte maturation in some teleosts may last several weeks (Mylonas et al 1997).…”

Section: Discussionsupporting

confidence: 86%

Differential processing of yolk proteins during oocyte hydration in marine fishes (Labridae) that spawn benthic and pelagic eggs

Finn

Wamboldt²,

Fyhn³

2002

Mar. Ecol. Prog. Ser.

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Section: Discussionsupporting

confidence: 86%

Differential processing of yolk proteins during oocyte hydration in marine fishes (Labridae) that spawn benthic and pelagic eggs

Finn

Wamboldt²,

Fyhn³

2002

Mar. Ecol. Prog. Ser.

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“…The nucleus, during the final maturation, moves from the centre to the periphery (Nagahama, 1983), and eventually breaks down when reaching it. The following water influx (hydrated oocyte) is probably driven by the proteolysis of yolk protein into free amino acids and consequent osmosis (Craik & Harvey, 1987; Kjesbu & Kryvi, 1989).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the temporal development of the ovaries in Gadus morhua from the Sound and Kattegat, North Sea

Vitale

Cardinale

Svedäng

2005

Journal of Fish Biology

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The gonadal development of cod Gadus morhua in the Sound and Kattegat, North Sea, was studied by investigating their histological structure on a temporal scale by intense sampling from September 2002 to May 2003. Different age classes were followed and the proportion mature in each age class within each area was analysed. Based on existing maturity criteria, a modified system, based on histological features, was developed in order to emphasize the crucial step in the developmental process, i.e. the passage from endogenous to exogenous vitellogenesis. Only fish that had attained exogenous vitellogenesis could be considered as being reproductively active in the forthcoming breeding season (Kjesbu et al., 2003). The histological based maturity scale will greatly improve the capability of separating mature from immature individuals in the studied areas, that is fundamental for an accurate and unambiguous estimate of the spawning stock biomass. Furthermore, the results showed a larger proportion of mature individuals per age class in the Kattegat stock compared to the Sound stock, which implied an earlier maturity for this stock. This difference in maturation pattern might have been related to a relaxation of competition, i.e. enhanced growth rate, as an effect of different levels of exploitation and technical fishing regulations between the two adjacent areas. # 2005 The Fisheries Society of the British Isles

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“…Further comparative evidence that lipid makes little contribution to egg buoyancy in marine species is provided by the data of Tocher & Sargent (1984), who showed that the ovaries of species with demersal eggs such as herring Clupea harengus, capelin Mallotus villosus and sand eel Ammodytes lancea have lipid contents, expressed in terms of dry weight, which are equal to or greater than those of pelagic eggs of four gadoid species investigated by them. Moreover, mature demersal eggs of marine and freshwater teleosts have much lower water contents than pelagic eggs, usually 60-70% (Craik & Harvey, 1984, 1986.…”

Section: Discussionmentioning

confidence: 99%

The causes of buoyancy in eggs of marine teleosts

1987

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Pelagic eggs and demersal eggs of teleosts both have osmotic concentrations similar to that of the maternal body fluids, less than half that of sea water. Pelagic eggs are buoyant because they contain such large quantities of this dilute aqueous fluid. While the demersal eggs of teleosts usually have a water content of 60–70%, the buoyant pelagic eggs of marine teleosts such as whiting, Norway pout, saithe, cod, haddock, turbot, dab, plaice, witch, long rough dab, halibut and sole typically have a very high water content (ca. 92 %) and a lipid content of 10–17% of egg dry weight. About 90% of the buoyancy of such eggs in sea water is caused by their high aqueous content, only about 10% being caused by lipid. The buoyant eggs of grenadier and ling have large oil globules and higher lipid contents, 27 and 35 % of dry weight respectively. Nevertheless, most of their buoyancy is provided by their high aqueous contents (89 and 81 % water). The high water content of pelagic eggs is brought about by a massive influx of water into the oocytes during meiotic maturation (ripening) after vitellogenesis but before ovulation. In cod and plaice, ripening is accompanied by a four- to five-fold increase in both water content and free amino-acids, and by a large influx of both potassium and sodium. In cod, free amino-acids contribute much more than these inorganic ions to the water influx and to the total osmotic concentration of the mature egg, but in plaice the relative contribution of inorganic ions approaches that of the free amino-acids.

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Phosphorus metabolism and water uptake during final maturation of ovaries of teleosts with pelagic and demersal eggs

Cited by 25 publications

References 15 publications

Differential processing of yolk proteins during oocyte hydration in marine fishes (Labridae) that spawn benthic and pelagic eggs

Differential processing of yolk proteins during oocyte hydration in marine fishes (Labridae) that spawn benthic and pelagic eggs

Evaluation of the temporal development of the ovaries in Gadus morhua from the Sound and Kattegat, North Sea

The causes of buoyancy in eggs of marine teleosts

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