Fish Eggs.

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Fish Eggs

General characteristics of eggs S.No. Pelagic eggs Demersal eggs   1.     Eggs are small in size Eggs are bigger in size 2.     Eggs laid singly Eggs are laid in mass 3.     Small yolk content More yolk content 4.     Prolonged developmental period Developmental period is short 5.     Egg membrane thin and smooth Egg membrane thick 6.     Fecundity is more Fecundity is less 7.     No parental care Mostly with parental care 8.     The eggs are transparent e.g. Sardina pilchardus Solea solea Gadus morhua The eggs are opaque e.g. Anguilla sp. Synodus indicus Clupea harengus

General characteristics of eggs S.No. Pelagic eggs Demersal eggs   6.     Fecundity is more Fecundity is less 7.     No parental care Mostly with parental care 8.     The eggs are transparent e.g. Sardina pilchardus Solea solea Gadus morhua The eggs are opaque e.g. Anguilla sp. Synodus indicus Clupea harengus

Identification keys of isolated pelagic fish eggs Single oil globule Non-smooth egg membrane (Ilisha elongata) Wide perivitelline space (Japanese sardine) Narrow perivitelline space (Carangidae) Non-oil globule Non-smooth egg membrane (Synodontidae) Wide perivitelline space (Anguilliformes) Narrow perivitelline space (Engraulidae) Multi-oil globules Non-smooth egg membrane (Soleidae) Narrow perivitelline space (Cynoglossidae)