Preliminary observations on cage culture of Tilapia esculenta Graham and Tilapia xillii (Gervais) in Lake Victoria waters, at the Freshwater Fisheries Institute, Nyegezi, Tanzania

Cage culture of Tilapia is not suggested as a substitute for any known techniques in fish culture, but as one of the various techniques of obtaining more fish under controlled conditions. This fact has been very well accepted in various countries. Whererever facilities exist, this line of fish culture should be vigorously explored as a possible avenue in increasing fish production. High density stocking, management under controlled conditions, easy technique of fabricating the cage at relatively low cost, having no demand on land area, absence of prolific and effective breeding and easy availability of fish when a person needs it are a few of the attractions of the technique. The studies indicate that it is desirable to have different meshes for the cages, such as, small meshed cages for rearing fry to fingerlings stages, and larger meshed cages for rearing fingerlings to table sized fishes. II' the meshes are small, the resistance will be more and less water wilt pass through. While feeding with powdered food material, because of brisk activity of feeding fish, a part of the feed appeared wasted. This can be easily overcome if we would resort to feeding fish with cheap pelleted feeds which will no doubt reduce wastage. Precaution has to be taken against damage of the net and thereby loss of fish and against poaching by unauthorised persons. In the present attempt has been demonstrated the possibility of utilizing locally available species of Tilapia for cage culture and obtaining moderately satisfactory growth rates.

Growth rates of Tilapia esculenta (Graham) and Tilapia zillii (Gervais) under cultivation in ponds at Nyegezi, Tanzania

Aquaculture in Tanzania is still on a subsistence level and most of the ponds are maintained as part time job. The ponds are too small, shallow and over crowded with stunted Tilapia spp. In the present paper the results of experiments conducted in ponds at Nyegezi with T. esculenta and T. zillii are presented. This was part of an overall project of developing techniques of fish cultures with Tilapia under the limited existing conditions at Nyegezi. In a mono - species culture experiement with Tilapia zillii in nine month's time an average size of 172.8 mm/115.0 g was attained. In another experiment with T. zillii and T. esculenta in thirteen month's time, T. zillii attained an average size of 180.2mm/106.6 g and T. esculenta 193.6 mm/118.8 g. In another experiment with intensive feeding schedule an average size of 179.3 mm/126.6 g was attained by T. zillii and 191.0 mm/125.0 g by T. esculenta in four month's time. A locally prepared supplimentary feed with local Brewery Waste and Fish Meal (10:1) was readily accepted by both species of Tilapia. T. zillii voraciously fed on Cabbage leaves, Cauliflower leaves, Chinese cabbage leaves, Cassava leaves and on the common weed Comalina sp. Though all the items mentioned above were readily accepted by T. zillii feeding with Comaltna sp. was the easiest and most convenient because of its availability. In an intensive feeding experiment with vegetable leaves/Comalina sp. and the locally prepared supplimentary feed the fishes attained table size in four months time. Cement cistens of 5 X 3 X 1½ m size could be conveniently used for breeding both species of Tilapia. T. zillii had semi adhesive eggs and they were deposited on the sides of the cement wall. The number of young ones in a brood ranged from 160 to 314 in T. esculenta and 687 to 4,356 in T. zillii.

Hybridization between Tilapia zillii (Gervais) and Tilapia andersonii (Casteinau) at the Freshwater Fisheries Institute, at Nyegezi, Tanzania

As a part of an overall project on fishculture development techniques in Tanzania, hybridization between Tilapia zillii and Tilapia andersonii was carried out at the Freshwater Fisheries Institute, Nyegezi, Tanzania. T. andersonii, a plankton feeder, is not indigenous to Tanzania but was introduced in 1968 from Zambia for certain specific purpose. T. zillii, a macrovegetation feeder, is present locally and is common. In the present studies T. zillii (245.0 mm/260.0 g) female was hybridized with T. andersonii (288.0 mm/350.0 g) male. Under cement cistern conditions it was only after about four months of acclimatization that hybridization between the two occurred. About 1,637 interspecific hybrid fry were produced in a single brood. Eggs were adhesive and parental care shown by the female, the male being driven away. Growth under cistern conditions was slow, attaining a size of 134.8 mm/44.3 g in 10 months. But this growth rate need not be taken as ideal. In body shape, colouration and other morphometric characters the hybrids had inherited from both parents. The number of gill rakers among the hybrids was eighteen which was intermediate between T. zillii (12) and T. andersonii (27). Among one hundred and seventy two specimens (106.0 mm - 168.0 mm) cut and examined the sex ration was hundred per cent males and all of them were between II and IV stages of maturity. This is the first report of fish hybridization from Tanzania and possibly the first report on hybridization between T. zillii and T. andersonii. The full significanoe of the findings and its role in African fishculture is discussed.

[Intérieur de l'] église St Gervais : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58697

[Intérieur de l'] église St Gervais : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58698

[Intérieur de l'] église St Gervais [stèle à la mémoire des victimes du bombardement allemand du 29 mars 1918] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58699

[Intérieur de l'] église St Gervais [stèle à la mémoire des victimes du bombardement allemand du 29 mars 1918] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58700

13/5/20, meeting de la CGT au Pré-Saint-Gervais : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59270

13/5/20, meeting de la CGT au Pré-Saint-Gervais : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59271

L'art oenologique réduit à la simplicité de la nature , par la science et l'expérience ; suivi d'observations critiques sur l'appareil Gervais. Par A.-A. Cadet de Vaux,...

Mécénat texte imprimé : Cet ouvrage a été numérisé grâce à Norberto Giorgio Kuri

Voyage de Jean de Mandeville, Roman de Fauvel, par Gervais Du Bus, et pièces diverses.

Contient : « Le livre des parties d'Oultre mer, lequel fu fait, ordonné et compilé par honorable et vaillant seigneur Jehan de Mandeville... Escript (fol. 62) par moy, Ogier de Caumont, en la cité de Liege, et finy le penultieme jour de juillet l'an mil CCC IIIIxx??? et XVI. » Cf. R. Röhricht, Bibliotheca geographica Palestinae, p. 79 ; On lit : « Hunc librum acquisivit monasterio Sancti Victoris prope Parisius frater Johannes Lamasse, dum esset prior ejusdem ecclesie. Scriptum anno Domini 1424 » ; Prière à la Vierge ; « Dit de la rose », pièce en l'honneur de la Vierge ; Les peines de l'enfer ; « Scriptum quoddam super degradatione et combustione quorumdam fratrum ordinis Predicatorum, qui... opinionem suam ab ecclesia damnata de conceptione purissime Virginis matris Domini Jhesu deffendere nitebantur... Actum anno Domini millesimo quingentesimo nono. » Cf. Du Boulay, Historia Universitatis Parisiensis, t. VI, p. 45 ; Pater Noster et Ave Maria, en vers ; Vers sur le plaisir de boire. « Ad primum morsum, nisi potavero mort sum... » (15 vers) ; « Statutum sacre facultatis Theologie studii Parisiensis super materia conceptionis immaculate gloriosissime Virginis... » (1497) ; Paraphrase, en vers français, de l'Ave maris stella ; « Clericus sic ethimologizatur : Per c intelligitur quod sit clarus... » ; « Almalarius (sic), qui loquitur de duobus ebdomadis passionis Christi. Due ebdomade passionis Christi significant duo tempora ante legem et sub lege... » ; Explications, en latin, du Pater et du Credo. « Elegit Dominus Deus noster Jhesus Christus septem apostolos... » ; « Tabula fidei christiane. Septem virtutes principales : fides, spes... » ; Notes de comput. « Ad habendum ciclum solarem, secundum Gallandum, sive litteram dominicalem... » ; Prière à la Vierge ; « La deputaison » ou « le mireur du corps et de l'ame. Une grant vision est en ce livre escripte... » ; Prières à la Vierge ; I ; II ; III ; Note relative à « Jehan Le Mire, jadis trésorier des guerres » (1339) ; La maison de sapience ; Poème moral sur la mort du Christ ; Vers latins, en l'honneur de S. Jean-Baptiste ; « Missa pro evitanda mortalitate, quam dominus papa Clemens sextus constituit et fecit... » ; « Le Testament maistre Jehan de Meun. » Cf. Histoire littéraire, t. XXVIII (1880), p. 416 (art. de P. Paris) ; Roman de Fauvel, par Gervais Du Bus. Cf. Histoire littéraire, t. XXXII (1898), p. 108 (art. de M. G. Paris) ; Vers latins contre les femmes ; Autre pièce contre les femmes ; Autre pièce sur les femmes. « Se j'avoye une fame qui ne me mentist point... » ; Prière. « Doulx Diex, qui es sans fin et sans initium... » ; « Les heures de la Croiz [en vers], ausquellez le pape Jehan XXII donna i an ex xl jours de vray pardon à quelconque persone, qui par devocion dira ceste office du mistère de la Passion Jhesu Crist » ; Prière à la Vierge