Linares, F.

Olmedo-Herrero, M. (Mercedes)

Ortega-García, A. (Aurelio)

Peleteiro-Alonso, J.B. (José Benito)

Álvarez-Blázquez-Fernández, B. (Blanca)

English

A study was conducted on the effect of water temperature on fattening of blackspot sea bream, comparing growth in fish kept in tanks with water at room temperature (13.6-19.2 degrees C) with the growth in water heated at a constant temperature of 19, with two batches of 300 fish, born in captivity, with an initial weight of around 20.25 g and 48.74 g. These in turn, were distributed into groups. Bimonthly samplings were made on size and weight, for 18 months. The average weight attained by the smaller sized fish was around 300.78 g, at room temperature, and 304.09 g in warm water. The larger sized individuals attained weights of about 355.06 g and 359.42 g at room temperature and warm water, respectively. The results show no significant differences between the growth for the batches of fish fattened at the temperature ranges studied.

Linares, F. (Fátima)

Álvarez-Blázquez, B. (Blanca)

Repositorio Institucional Digital del IEO

·r: Experience with ongrowing juvenile blackspot sea bream(Pagellus bogaraveo) born in captivity,in tanks at different temperaturesCahiers Options Méditerranéennes. Vol. 47, 2000, pp.153-156M. Olmedo', J.B. Peleteiro', F. Linares", B. Alvarez-Blázquez', C. Gómez' and A. Ortega'"'Centro Oceanográfico de Vigo, Instituto Español de Oceanografía, Cabo Estay, Canido,Apdo. 1552,36208 Vigo, Spain, e-mail: mercedes.olmedo@vi.ieo.es"Centro de Investigacions Mariñas, Apdo. 13, 36620 Vilanova de Arousa, Pontevedra, Spain***Centro de Experimentación en Acuicultura, Couso, Ribeira, 15960 La Coruña, SpainSUMMARY - The results 01 experiences conducted on blackspot sea bream (Pagellus bogara veo) during thegrowing stage have shown that an increase in water temperature improves growth in individuals lrom 2 to 20 9weight. On this basis, this work was designed in order to check il growth in this species may be accelerated overa longer period 01 time. A study was conducted on the effect 01 water temperature on lattening 01 the blackspotsea bream, comparing growth in lish kept in tanks with water at room temperature (13.6-19.2°C) with the growth01 others kept in water heated at a constant temperature 01 19±0.5°C. This experience was conducted with twobatch es 01 300 lish, born in captivity, with an initial weight of 20.25±8.87 9 and 48.74±14.16 g. These in turn,were distributed into groups in order to be able to make a comparison between the diflerent conditions.Bimonthly samplings were made on size and weight, over the 18 months 01 the experience. The average weightattained by the smaller sized fish was 300.78±71.78 9 lor those cultured at room temperature, and 304.09±72.169 for fish cultured in warm water. The larger sized individuals attained weights 01 355.06±96.43 9 and359.42±78.93 9 in water at room temperature and warm water respectively. Estimated daily growth rates [G =(Ln Pf/Pi)*100/t] were 0.30% and 0.31 % for the groups of small lish, and 0.27% for all the larger sized fish. Theresults show no signilicant differences (p < 0.05) between the growth tor the batch es 01 lish lattened at thetemperature ranges studied.Key words: Blackspot sea bream, Pagellus bogaraveo, captivity, juveniles, ongrowing.RESUME - "Expérience de grossissement de juvéniles de la daurade rose (pagellus bogaraveo) née encaptivité, dans des bassins á différentes températures". Les résultats des expériences faites avec la daurade(pagellus bogaraveo) au stade de préengraissage ont prouvé qu'une hausse de la température de I'eauaugmente la croissance des poissons d'un poids d'entre 2 et 20 g. Sur cette base, nous avons mis en ceuvre cetravail afin de vérifier si la croissance de cette espéce pouvait étre accélérée pendant une période plus longue.On a réalisé une étude de I'effet de la température de I'eau sur I'engraissement de la daurade et nous avonsétabli une comparaison de la croissance de poissons maintenus dans des réservoirs d'eau á températureambiante (13,6·19,2°G) avec celle d'autres poissons maintenus dans de I'eau préchauffée á une températureconstante de 19±O,5°C. Nous avons réalisé I'expérience avec deux groupes de 300 poissons nés en captivitéavec un poids initial de 20,25± 8,87 9 et 48, 74±14, 16 g. Ges poissons ont été encore répartis en deux groupesafin de faire une comparaison des différentes conditions. On a établi des échantillonnages bimensuels de tailleet de poids pendant les 18 mois de I'expérience. Les poids moyens atteints par les poissons de moindre tailleont été de 300,l8±71,l8 9 pour les poissons cultivés dans I'eau á température ambiante et 304,09±72, 16 9 pourceux cultivés dans I'eau chaude. Les plus grands ont atteint des poids de 355,06±96,43 9 et 359,42±78,93 9dans I'eau ambiante et chaude respectivement. Les taux de croissance joumetiére {G = (Ln Pf/Pi) • 100/t}calculés ont été de 0,30% et 0,31 % pour les groupes de petits poissons et 0,27% pour les poissons plus grands.Les résultats ont montré qu'il n'y a pas de différences significatives (p < 0,05) entre la croissance des deuxgroupes de poissons engraissés selon les degrés des températures étudiées.Mots-clés : Dorade rose, Pagellus bogaraveo, captivité, juvéniles, engraissement.IntroductionSea bream (Pagellus bogara veo) rearing is currently under consideration as an alternative to otherspecies now being reared, due to its high commercial value, scarcity in the market and biologicalcharacteristics, which make it suitable for life in captivity. This is one of the priority species selected inour lines of research, and the results obtained in terms of growth in captivity (Peleteiro et al., 1994),153spawning and larval culture (Peleteiro el al., 1997; Olmedo el al., 1998) appear to show a greatpotential in the species for rearing.Initial results for ongrowing (Greco el al., 1989; Chereguini el al., 1990; Peleteiro el al., 1994;Genovese el al., 1998) were obtained trorn individuals caught in the natural environment. Ongrowing01 this species, currently under study, is not as fast as tor other sparids, such as Gilthead bream(Cejas el al., 1993). This is probably due to the íact that there is no ideally specilic lood Ior thisspecies and culture conditions are still not the most adequate.It has already been shown that, during the prefattening stage, growth in sea bream improves astemperature increases (Olmedo el al., 1997). This experience was designed to check if an increase intemperature could accelerate growth in the ongrowing state and, in this manner. attain the commercialsize more rapidly.Material and methodsThe individuals used in this experience were Irom wild reproducing spawn stock at the Martesanalcompany, located in Valdoviño (La Coruña). These individuals were prelattened at the OceanographicCentre in Vigo.The experience was conducted with two batches (A and B) 01 300 individuals each, with an initialweight of 20.25±8.87 9 and 48.74±14.16 g. These batches were divided into groups and transferred to2 x 2 x 1 m tanks, with water at room temperature or with water at a controlled temperature of19±0.5°C.The fish were fed with two types of food: Rodabex 5-7 mm, and Europa-16, 7 mm, both supplied bythe company TROUW España, SA, with automatic food dosage. Daily food ration was 0.5-0.7% of lishweight.Samplings were taken at two month intervals for size and weight, measuring the length to thecaudal peduncle to the nearest mm below, and weight to 0.1 g. Individuals were previouslyanaesthetised with MS-222 (80 mg/l).Growth curves and corresponding equations were drawn for all groups. Daily growth curves werealso calculated [G= (Ln Pf/Pi)*1OO/t). where Pf is the final weight and Pi the initial weight, and t the timepassed expressed in days.Data were analysed by an ANOVA and comparison was made of the growth curve slopes (t-test).Results and discussionAverage weight attained by the smaller sized individuals over the 18 month period of theexperiment, were 300.78±71.78 9 tor those reared in water at room temperature (13.6-19.2°C), and304.09±72.16 9 in warm water (19±OSC) and 355.06±96.43 9 and 359.42±78.93 9 for the largersized individuals in water at room temperature and warm water respectively (Fig. 1).Analysis of the results showed that the average weights 01 the individuals reared at roomtemperature do not differ (p < 0.05) in weight from those reared at controlled temperature.To estimate growth, linear regression was applied, and the corresponding equations were obtained.(Figs 2 and 3). These equations were very similar to those obtained by Peleteiro el al. (1994), for wildsea bream ongrown from 170 9 to 460 g.Daily growth rates [G = (Ln PflPi)*1OO/tj calculated were 0.30% and 0.31% tor the groups of smallfish, and 0.27% for all the larger individuals.Tank mortality did not exceed 7%. Considering that blackspot sea bream is a species highly154s'ansitive to handling and stress, it is essential to maintain individuals under more controlled conditions(semi-dark and at greater depth) than other species, in arder to improve survival.20.019.0O 18.0e~ 17.0::::l~al 16.0Q.Ealf- 15.014.013.0Feb-97 Apr-97 June-97 Aug-97 Oct-97 Dec-97 Feb-98 Apr-98 June-98Time (months)-+-Temp. env. -Temp. warmFig. 1. Average temperatures throughout the experience.450400350300Ol250~(!) 200S15010050OOy = 19.946x + 24.738R2 = 0.9963:Y=1990~+25.10SR2 = 0.9981\._---_._---_ .... _--~-~ _.-i!y = 18.078x - 1.7069R2 = 0.9905y = 17.808x - 6.7997R2 = 0.98945 10Time (months)15 20• A env. • A warm 4 B env. • B warmFig. 2. Growth in weighl.ConclusionsDuring the study period on the ongrowing stage of sea bream individuals, with initial weights of 20-40 g, maintaining the fish at a constant temperature of 19±O.5°C exerted no influence on grow1hwhencompared with grow1h in fish maintained at room temperature.1;", '-4"~.,.15511I1i1:1I.124TI~============~----------------i22 ~ •y = 0.5975x + 11.98R2 = 0.9703,20·,~ 18E~E 16eal-.J 14•y = 0.6883x + 9.34R2 = 0.949712 -10E!y = 0.6662x + 9.7718R2 = 0.9434 I118O 8 10 12 14Time (months)18 202 4 6 16• A env. 11 A warm A B env. CI B warmFig. 3. Growth in size.Sea bream growth, considered to be slower than in other sparid species experimented on, may beimproved by administering a food specific for the species, able to meet its nutritional requirements. Itwould also be necessary to study aspects regarding the rearing conditions, such as the light and depthin tanks.ReferencesCejas, J., Samper, M., Jerez, S., Forés, E. and Villamandos, J. (1993). Perspectivas de cultivo de breca(Pagellus erythrinus) y sargo (Oiplodus sargus); Primeros resultados de crecimiento comparado conla dorada (Sparus aurata). In: Actas del IV Congreso Nac. de Acuicult., pp. 127-132.Chereguini, O., Fernández-Pato, C.A. and Martínez Tapia, C. (1990). Growth of wild black-spot seabream (pagellus bogaraveo B.) from Cantabrian sea under laboratory conditions. Some interestingparameters. ICES CM 1990/F32.Genovese, L., Micale, V., Patti, F. and Greco, S. (1998). Growth performance of Pagellus bogaraveoreared at different stocking densities. In: 33 International Symposium on New Species forMediterranean Aquaculture, Book of Abstracts, 22-24 April, Alghero (Italy).Greco, S., Cavaliere, A., Lo Paro, G., Manganaro, A. and Sturniolo, G. (1989). Effetti di diete bilanciatenell'allevamento intensivo di Pagellus bogara veo (Rovello). Oebalia, 15(2)N.S. 637-644.Olmedo, M., Linares, F., Ruiz, N., Alvarez-Blázquez, B., Peleteiro, J.B., Ortega, A. and Rodríguez, J.L.(1997). Preengorde de alevines de besugo (Pagellus bogaraveo B.) nacidos en cautividad. In:Actas VI Congreso Nacional Acuicultura, de Costa, J., Abellán, E., García, B., Ortega, A. andZamora, S. (eds), Cartagena, 9-11 July 1997. Ministerio de Agricultura, Pesca y Alimentación,Madrid, pp. 879-885.Olmedo, M., Peleteiro, J.B., Alvarez-Blázquez, B. and Gómez, C. (1998). First experiences with larvalculture of blackspot sea bream (pagellus bogaraveo). ICES CM 1998/L:21.Peleteiro, J.B., Olmedo, M., Cal, R.M. and Gómez, C. (1994). Growth under laboratory conditions ofwild juvenile black-spot sea bream (Pagellus bogaraveo). Aquaculture Europe, 18(4): 6-10.Peleteiro, J.B., Olmedo, M., Gómez, C. and Alvarez-Blázquez, B. (1997). Study of reproduction incaptivity of blackspot sea bream (pagellus bogaraveo B.). Embryonic development andconsumption of vite/line saco ICES CM 1997/HH:19.156

Experience with ongrowing juvenile blackspot sea bream (Pagellus bogaraveo) born in captivity, in tanks at diferent temperatures

A study was conducted on the effect of water temperature on fattening of blackspot sea bream, comparing growth in fish kept in tanks with water at room temperature (13.6-19.2 degrees C) with the growth in water heated at a constant temperature of 19, with two batches of 300 fish, born in captivity, with an initial weight of around 20.25 g and 48.74 g. These in turn, were distributed into groups. Bimonthly samplings were made on size and weight, for 18 months. The average weight attained by the smaller sized fish was around 300.78 g, at room temperature, and 304.09 g in warm water. The larger sized individuals attained weights of about 355.06 g and 359.42 g at room temperature and warm water, respectively. The results show no significant differences between the growth for the batches of fish fattened at the temperature ranges studied.N

Experience with ongrowing juvenile blackspot sea bream (Pagellus bogaraveo) born in captivity, in tanks at diferent temperatures

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