TITLE:
Spawning induction and fecundity of commercial native fish species from the São Francisco River basin, Brazil, under hatchery conditions
AUTHORS:
Fábio Pereira Arantes, Yoshimi Sato, Edson Vieira Sampaio, Elizete Rizzo, Nilo Bazzoli
KEYWORDS:
Spawning Induction; Fecundity; Oocyte; Neotropical Fish; São Francisco River
JOURNAL NAME:
Agricultural Sciences,
Vol.4 No.8,
August
9,
2013
ABSTRACT: In order to exploit
native fish species for aquaculture, basic parameters of artificial reproducetion and estimates of reproductive potential for this fish must be determined
to improve hatchery success. We analyze seven Brazilian commercial fish.
Spawning was induced using the hypophysation method, with injection of crude
carp pituitary extract (CCPE). Characiformes species signaled the spawning time
with behavioral alterations (usually circular movements). The time of oocyte
extrusion varied from 5.3 ± 0.3 h in Salminus
franciscanus to 8.6 ± 0.1 h in Prochilodus argenteus after the second CCPE injection. The greatest diameter of
a vitellogenic oocyte was registered for P. argenteus (873.9 ± 122.2 μm) and the
smallest was for Pimelodus maculates (465.4 ± 36.3 μm). The diameter of vitellogenic oocytes was very similar among species
belonging to the same family. The highest ROI values were registered for Prochilodus
costatus(27.0 ± 3.5 μm) and P. argenteus (23.4 ± 3.7 μm), while the lowest values were found in Pseudoplatystoma
corruscans (4.6 ± 0.9 μm) and P. maculatus (6.0 ± 1.3 μm). Absolute fecundity (number of oocytes released at spawning) was
lowest in P. maculatus and highest in P. corruscans. Relative fecundity (RF) presented a high
correlation (r = 0.98 to 0.99) with gonad weight, indicating high efficiency of
spawning. The RF also presented a high correlation with body weight (r = 0.88
to 0.97) and total length (r = 0.86 to 0.92). The highest RF was registered for Leporinus obtusidens, and the lowest was for P. corruscans. Released fecundity had a negative correlation with
the diameter of vitellogenic oocytes and with the height of the follicular
cells, and a positive correlation with the thickness of the zona pelucida.
These results indicate that the species studied herein are suitable candidates
for aquaculture due to their reproductive and zootechnical characteristics.