Published February 26, 2010
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Population dynamics of the migratory fish Prochilodus lineatus in a neotropical river: the relationships with river discharge, flood pulse, El Niño and fluvial megafan behaviour
Description
Stassen, Marinke J. M., van de Ven, Max W. P. M., Heide, Tjisse van der, Hiza, Marco Antonio Guerrero, Velde, Gerard van der, Smolders, Alfons J. P. (2010): Population dynamics of the migratory fish Prochilodus lineatus in a neotropical river: the relationships with river discharge, flood pulse, El Niño and fluvial megafan behaviour. Neotropical Ichthyology 8 (1): 113, DOI: 10.1590/S1679-62252010005000006, URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100014&lng=en&tlng=en
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- urn:lsid:plazi.org:pub:FF85FFEAE313FFA1AB6F430FED3FF256
References
- Data on gonad development where derived from Guerrero Hiza (1998). On six different dates in 1998 (May 22, June 19, August 7, August 25, September 11 and September 30) 25 fishes were obtained from fish traps in the Pilcomayo canyon near Villa Montes, and the stage of gonadal maturation was analyzed for each fish. To each fish one of the following stages (I to V) was attributed. Stage I (inactive stage): Ovaries are small. No oocyte is visible to the naked eye. Stage II (recovering stage): Few oocytes are visible to the naked eye. There are few yolks. Stage III (early maturing stage): Most of the oocytes are visible to the naked eye. There are some yolks in these oocytes. Stage IV (late maturing stage): All the oocytes are visible to the naked eye. There are many yolks in the oocytes. Stage V (mature stage): Many mature oocytes are released from their follicles into the ovarian cavity. The oocytes could flow out through the genital opening when the abdomen is gently pressed. The mean value for the gonadal development stage of the 25 fishes was calculated.
- From May 1998 until February 1999 samples of the Pilcomayo River were collected regularly at Villa Montes (Bolivia). Immediately after collection temperature was measured and pH and bicarbonate (HCO3 -) were determined, after which samples were filtered (0.45 μm). Next 1 ml of nitric acid per 100 ml water was added, after which the samples were stored in pre-washed polyethylene containers at 20oC until analysis. For anion analyses samples were filtered and 60 mg citric acid per 100 ml water was added after which the samples were stored in pre-washed polyethylene containers at -20oC until analysis (see Smolders et al., 2004). Total dissolved ion concentration was calculated from the analyses by adding up the concentrations of all cation and anions.