Abstract：
:The reproductive season of tilapia was studied by monthly samplings at Emiliano Zapata dam, Morelos State, Mexico. From February 1999 through February 2000 a sample of 50 fish was taken from the commercial catch (castnet, 6.5 cm of mesh size). The observed sex ratio was 1:1.29 (females:males) (chi(2)=10.26; p<0.05). The tilapia reached maturity at 151.3 mm (females) and 152.0 mm (males) of total length. Rainy (August) and dry (February) seasons were determined as the breeding period. Fecundity variation was better correlated with length (r=0.7473: p<0.002) than with weight (r=0.7395; p<0.002). The fecundity ranged between 243 and 847 oocytes per fish, with egg diameter from 300 to 3 700 microm. Intensive breeding activity in August and February coincide with phytoplankton biomass increase.
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Peña-Mendoza B,Gómez-Márquez JL,Salgado-Ugarte IH,Ramirez-Noguera Ddoi
10.15517/rbt.v53i3-4.14666subject
Has Abstractpub_date
2005-09-01 00:00:00pages
515-22issue
3-4eissn
0034-7744issn
2215-2075journal_volume
53pub_type
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journal_title：Revista de biologia tropical
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journal_title：Revista de biologia tropical
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journal_title：Revista de biologia tropical
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journal_title：Revista de biologia tropical
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journal_title：Revista de biologia tropical
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journal_title：Revista de biologia tropical
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更新日期：2013-06-01 00:00:00
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journal_title：Revista de biologia tropical
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更新日期：2005-03-01 00:00:00
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journal_title：Revista de biologia tropical
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journal_title：Revista de biologia tropical
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更新日期：1997-09-01 00:00:00
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