Suitability of brackish water tilapia species from the Ivory Coast for lagoon aquaculture. II - Growth and rearing methods

Abstract

In intensive culture, the two species of brackish water tilapia, T. guineensis and S. melanotheron, have proved disappointing. Even under most favourable conditions, i. e. the monosex male culture of S. melanotheron, a poor growth rate (about O. 5g. d-') and a mediocre feed conversion do not presage a profitable aquaculture exploitation. On the other hand, extensive culture trials using the original "acadja-enclosure" technique have given very encouraging resu1ts.A nnual fish yields of more than 8 t/ha, including 70 to Sol ;/, of S. rnelanotheron of marketable size, are possible without any artificial feeding.

Seasonality in the deep sea and tropics revisited: what can otoliths tell us?

“…5a). These observations are related to the frequent growth differences among individuals of several cichlid species populations (Hecht 1980;Pauly et al 1988;Legendre et al 1989;Booth et al 1995;Panfili et al 2004). Nevertheless no clear interpretation can be given to explain such differences in otolith GI for S. melanotheron (Fig.…”

Variations saisonnières des indices épidémiologiques de trois monogènes parasites de <i>Sarotherodon melanotheron</i> (pisces : Cichlidae) dans le lac d’ayamé i (Côte d’Ivoire)

“…Pariselle, 1994 ;Pariselle et Euzet, 1994, 1995, 1996, N'Douba, 2000Gnayoro, 2008), aucune étude n'a été consacrée à la dynamique saisonnière des parasites du tilapia Sarotherodon melanotheron melanotheron. Cette sous-espèce fait l'objet d'une attention toute particulière en aquaculture (Legendre et al, 1989) du fait qu'elle présente un intérêt économique (Hem & Avit, 1994). En outre, dans le lac de barrage d'Ayamé I, situé au Sud Est de la Côte d'Ivoire, ce poisson représente actuellement plus de 50 % des captures des pêches commerciales (Gourène et al, 1999).…”

Some aspects of biology and aquaculture potentials of Tilapia guineensis (dumeril) in Nigeria

“…The few nutritional studies conducted on this species shows that the growth rates which have been obtained thus remain poor (Legendre 1983;Campbell 1987;Legendre et al 1989), especially when compared with those observed for other tilapia species already used in aquaculture. Consequently, research directed towards this species has not been encouraging and has therefore created a vacuum that does not improve the growth performance of this tilapia species which is believed to be of great aquaculture potentials most especially in the brackish water zone of Nigeria.…”

“…Besides, Legendre et al (1989) reported that intensive culture of brackish water tilapia, T. guineensis have proved disappointing even under most favourable conditions. Copepods are increasingly seen as a supplementary feed to rotifers and Artemia in the culture of 'difficult' marine fish (Battaglene and Fielder 1997).…”

“…Both digestible energy (DE) and metabolizable energy (ME) have been used to express feedstuffs values for fish (National Research Council 1981) but many researchers often use ME and DE values interchangeably and report only DE values because of difficulties in obtaining ME values for fish. Legendre et al (1989) conducted a study to investigate the influence of feeding frequency on male monosex culture of Tilapia guineensis. Five feeding frequencies were compared: 1, 2, 4 and 8 meals distributed during the day between 8.30 a.m and 7.00 p.m., and 8 meals distributed during the night between 8.30 p.m. and 7.00 a.m., using a pelleted feed containing 30% crude protein and with 270 kcal per 100 g. The daily rate initially fixed at 5% of total fish biomass, was progressively reduced to 2% until the end of the experiment.…”