Relative abundance and reproductive tactics of a Loricariidae species at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil

Biota Neotropica

Dayani Bailly²  Valéria Flávia Batista-silva¹  Milza Celi Fedatto Abelha¹  Elaine Antoniassi Luiz Kashiwaqui¹  Carlos Alexandre Fernandes¹  Edson Dias De Carvalho¹ 

[1] ,Universidade Federal de Goiás ICB1 Laboratório de Ecologia Teórica e SínteseGoiânia GO ,Brasil

关键词: fish;    distribution;    oocyte diameter;    fecundity;    reproductive period;    peixes;    distribuição;    diâmetro de ovócitos;    fecundidade;    período reprodutivo;   

DOI  :  10.1590/S1676-06032011000300014

来源: SciELO

【 摘 要 】

This study aimed to evaluate population abundance patterns and the main events in the reproductive cycle of Loricariichthys platymetopon at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil. Monthly samplings were conducted from October 2004 to September 2005 in three sections of the lagoon: entrance, middle and end, which resulted in the capture of 175 individuals. Spatial and temporal variation in abundance was obtained through CPUE (number of captured individuals/1000 m² of gillnets in 12 hours). The reproductive tactics considered were: duration, time and location of spawning, oocyte diameter and fecundity. The highest relative abundance was recorded in February, in the middle section of the lagoon, and the reproductive period lasted from September to February. The prevalence of females with spent ovaries and at rest in the following months indicated that reproductive activity ceased during autumn and winter. We observed that reproduction was high at the end section of the lagoon. The recorded mean oocyte diameter was 1.67 (SD ± 0.76) mm, mean absolute fecundity was 962.1 (SD ± 382.48) oocytes, and relative fecundity was 7.60 (SD ± 2.25) oocytes/g and 5.13 (SD ± 0.75) oocytes/cm. These tactics, probably are related to the settlement of L. platymetopom in Saraiva Lagoon, as well as in the different biotopes of the Upper Paraná River floodplain.

【 授权许可】

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