Reproductive aspects of Macrobrachium amazonicum (Decapoda: Palaemonidae) in the State of Amapá, Amazon River mouth

Acta Amazonica

Jô De Farias Lima²  Luis Mauricio Abdon Da Silva¹  Thibério Carvalho Da Silva¹  Jamile Da Silva Garcia¹  Ilana Da Silva Pereira¹  Karlia Dalla Santa Amaral² 

[1] ,Empresa Brasileira de Pesquisa Agropecuária Embrapa Amapá Macapá Amapá ,Brazil

关键词: Palaemonid eggs;    first maturation;    fecundity;    morphometric relationships;    reproduction;    ovos de palaemonideos;    primeira maturação;    fecundidade;    relações morfométricas;    reprodução;   

DOI  :  10.1590/S0044-59672014000200010

来源: SciELO

【 摘 要 】

Macrobrachium amazonicum is an indigenous prawn vastly distributed in basins of South America, widely exploited by artisanal fisheries in northern and northeastern Brazil and, with great potential for aquaculture. This study aimed to investigate general aspects of population structure and reproductive characteristics (size at first maturity, fecundity and reproductive output) of M. amazonicum from two important areas to artisanal prawn fishing located at the mouth of the Amazon River, State of Amapá. The specimens were captured using 20 handcrafted traps called "matapi". A number of 5,179 prawns were captured, 2,975 females and 2,195 males resulting in 1.35:1 female to male ratio. Santana Island and Mazagão Velho showed females predominated in the population. A reproductive peak period was observed from January to April/2009 and in December/2010, coinciding with the period of higher rainfall. The recruitment peak occurred in June and July/2009. Egg-bearing females ranged in size (carapace length) from 11.10 to 29.6 mm. Fecundity increased with female size and reached up to 7,417 eggs. This amount of eggs is considered low if compared with other Macrobrachium estuarine species. Mean egg volume increased gradually from 0.121 to 0.24 mm³ during embryogenesis, representing 68.5% of overall increase from Stage I to Stage III. Eggs of M. amazonicum are small; this is typical for Macrobrachium species, which depends on brackish water to complete the larval development. Irrespective of female size, reproductive output of M. amazonicum varied between 4.8 and 21.85% of their body weight into eggs production.

【 授权许可】

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