Common Silver Biddy
Encyclopedia
The Common silver biddy or Gerres oyena is a silver biddy
fish found in the coastal waters of Southern Japan
. A species of bony fish belonging to the genus Gerres within the Gerreidae family.
development of the females occurs from March to September while the testes development of the males occurs between March an August. For both sexes, the maximal development occurs during April and May. Using the gonadosomatic index
(GSI), the minimum standard length (SL) at sexual maturity
was 89.7 mm for the females and 81.4 mm for males. The size at which 50% of individuals were sexually mature was 104 mm standard length in females and 92 mm standard length in males.
Silver biddy
Silver biddies , also spelled silver-biddies, is the name used to refer to bony fishes belonging to the Gerreidae family in the order Perciformes. They are also known as Jerki or Mudro...
fish found in the coastal waters of Southern Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
. A species of bony fish belonging to the genus Gerres within the Gerreidae family.
Reproduction
Based on the seasonal reproductive cycle of the species, ovaryOvary
The ovary is an ovum-producing reproductive organ, often found in pairs as part of the vertebrate female reproductive system. Ovaries in anatomically female individuals are analogous to testes in anatomically male individuals, in that they are both gonads and endocrine glands.-Human anatomy:Ovaries...
development of the females occurs from March to September while the testes development of the males occurs between March an August. For both sexes, the maximal development occurs during April and May. Using the gonadosomatic index
Gonadosomatic Index
The gonadosomatic index, abbreviated as GSI, is the calculation of the gonad mass as a proportion of the total body mass. It is represented by the formula: GSI = [Gonad Weight / Total Tissue Weight] x 100 . It is a tool for measuring the sexual maturity of animals in correlation to ovary...
(GSI), the minimum standard length (SL) at sexual maturity
Sexual maturity
Sexual maturity is the age or stage when an organism can reproduce. It is sometimes considered synonymous with adulthood, though the two are distinct...
was 89.7 mm for the females and 81.4 mm for males. The size at which 50% of individuals were sexually mature was 104 mm standard length in females and 92 mm standard length in males.