Fecundity of the Hypostomus affinis (Siluriformes, Loricariidae) in the Lajes Reservoir, Rio de Janeiro, Brazil
Rev. biol. trop
;
50(1): 193-197, Mar. 2002.
Article
in English
| LILACS
| ID: lil-333033
RESUMO
The armored catfish Hypostomus affinis is a widespread Loricariidae fish in the Lajes Reservoir (22 degrees 42'-22 degrees 50' S; 43 degrees 53'-44 degrees 05' W), the largest lentic environment in the Rio de Janeiro State, but little is known about their reproductive biology. One hundred and twenty five females, captured from January 1996 to December 1997, were used to assess ovarian development (29 were used to determine fecundity). The oocyte distribution by size-diameter classes revealed the occurrence of two modes suggesting an asynchronic development of the ovaries. The total fecundity ranged from 1235 to 4304, averaging 2374. An exponential relationship between fecundity and total length was determined, and a direct linear relationship was found between fecundity and total weight and gonad weight.
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Index:
LILACS (Americas)
Main subject:
Catfishes
/
Fertility
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Rev. biol. trop
Journal subject:
Biology
/
Tropical Medicine
Year:
2002
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Federal Rural do Rio de Janeiro/BR
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