Effects of culture conditions on larval growth and survival of stalked barnacles (Pollicipes pollicipes).

Pollicipes pollicipes (Crustacea: Scalpelliformes) is a highly prized food in Portugal and Spain and con- sequently a species of considerable interest to aqua- culture. Surprisingly, however, larval culture conditions for this barnacle have not been opti- mized. This study investigated the effects of temper- ature, diet, photoperiod and salinity on the growth and survival of P. pollicipes larvae. Temperature had a significant effect on specific growth rate (2.6–5.9% total width per day, from 11 to 24°C), reducing mean development time to the cyprid from 25 days at 11 °C to 10 days at 24°C, although this was accompanied by a significant increase in mortality to over 90% above 22°C. Mid- range temperatures (15–20°C) maximized total survival (19–31% respectively). Algal diets of Tetra- selmis suecica, T. suecica/Skeletonema marinoi and S. marinoi/Isochrysis galbana did not affect specific growth rate significantly, but survival (on average 39% in 15 days) and the proportion of high-quality healthy cyprids was significantly higher on the lat- ter two diets (11–15% of initial number of larvae). Photoperiod did not significantly affect the survival, although specific growth rate was significantly higher at 24:0 and 16:8 L:D. Salinity (20– 40 g L 1 range) did not affect growth and survival significantly. The best growth and survival were accomplished using rearing temperatures of 15–20°C, daily feeding with T. suecica/S. marinoi or I. galbana/S. marinoi and a photoperiod of 24:0 L:D.

Confidence intervals for large non- centrality parameter

We use asymptotic linearity to derive confidence intervals for large noncentrality parameters. These results enable us to measure relevance of effects and interactions in multifactors models when we get highly statistically significant the values of F tests statistics. We show how to use our approach by considering two sets of data as application examples.

Efeito do sistema de produção nas características físico-químicas e no perfil lipídico de três músculos de suínos alentejanos

O presente trabalho tem como objetivo testar o efeito do sistema de produção com dieta rica em ácido oleico nas características zootécnicas, de carcaça, físico-químicas e no perfil lipídico dos músculos Longissimus dorsi (LD), Biceps femoris (BF) e Semimembranosus (SM) de suínos de raça Alentejana. Foram utilizados 15 animais, divididos em dois grupos, o grupo IN (n=9) foi mantido em parques individuais abertos ao exterior com 3 m2 e o grupo OUT (n=6) foi mantido numa área de 3 ha com acesso a pastagem. O grupo OUT obteve melhores performances zootécnicas. O rendimento de carcaça foi igual para ambos os grupos, e o rendimento comercial e proporção de peças nobres foi superior nos OUT. Estes obtiveram menores teores de lípidos intramusculares mas maiores teores de PUFA (ácidos gordos polinsaturados) e melhores valores para os rácios PUFA/SFA (ácido gordos saturados) e n-6/n-3. O SM foi menos afetado pelo sistema de produção; Abstract: Effect of the rearing system in the physical-chemical characteristics and the lipid profile of three muscles from Alentejano pigs The present study aims to test the effect of rearing system with oleic acid rich diet on performance, carcass and physical-chemical characteristics, and lipid profile of the muscles Longissimus dorsi (LD), Biceps femoris (BF) and Semimembranosus (SM) from Alentejano pigs. The study used 15 animals, divided into two groups. The Group IN (n = 9) was kept in individual parks open to the exterior with 3 m2, and the OUT (n = 6) was held in an area of 3 ha with access to pasture. The OUT group obtained the best performances. The carcass yield was the same for both groups, meat yield and the proportion of noble parts was superior in the OUT. These obtained lower levels of intramuscular fat but larger PUFA levels (polyunsaturated fatty acids) and best values for the ratios PUFA/SFA (saturated fatty acids) and n-6/n-3. The SM was the least affected by the rearing system