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Neocaridina davidi, the “red cherry” shrimp, is becoming popular in trade markets because of the reddish coloration of females. The aim of this study was to analyze the impact of background substrate color, and the presence of shelters on N. davidi female pigmentation and astaxanthin content. In the first experiment juveniles were assigned to one of three treatments: white, red, or black background substrate. After 90 days, females exposed to the black background showed higher astaxanthin content and relative carapace colored area than those exposed to white and red backgrounds. The second experiment evaluated the presence of shelters with white or black backgrounds. Juveniles were assigned to one of four treatments: white background with shelters (WS), white background without shelters (WWS), black background with shelters (BS), and black background without shelters (BWS). After 90 days the presence of shelters did not influence either the color nor total astaxanthin content. Females exposed to BWS and BS had higher astaxanthin content and relative carapace colored area than those exposed to WWS and WS. Growing N. davidi with black substrates could be a low cost and easy method to improve its economic value. Furthermore, this species could be cultivated as a pigment-enriched food source for other aquatic species. Fil: Tomas, Ana Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina Fil: Sganga, Daniela Eliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina Fil: López Greco, Laura Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina

Diversity of cultured alternative species has been increasing with development of aquarium sector. As a result of this situation, invertebrate species have become popular creatures for aquarists. Among these species, freshwater shrimps have a good place in the aquarium industry with many types and varieties. Red cherry shrimps (Neocaridina denticulata) originated to Taiwan are one of the leading species of this group about to enter the aquarium. Nevertheless, there are very few scientific studies with this species. In this study, the effects of different aquarium feeds (Spirulina granule, granule, flake, stick) on growth performance and survival rate of red cherry shrimp were investigated. Different formed feeds which are widely used in the aquarium industry and nutritional contents closed to each other were used in this research. The study was carried out in 12 glass aquariums (50 L) with three replicates. 30 individuals with mean weight of 0.30±0.01 g and mean total lenght of 1.40±0.01 cm were placed to each aquarium because of shrimps live in groups. At the end of the study, there are statistical differences among the treatments (P, Akvaryum sektörünün gelişmesiyle birlikte yetiştiriciliği yapılan alternatif türlerde de çeşitlilik fazlalaşmaktadır. Bunun sonucu olarak omurgasız türleri akvaristler açısından popüler canlılar haline gelmişlerdir. Bu türler arasında tatlı su karidesleri birçok tür ve varyete ile akvaryum sektöründe iyi bir yer edinmişlerdir. Tayvan orijinli kiraz karidesleri (Neocaridina denticulata), bu grubun akvaryumlara girmesi konusunda öncü türlerdendir. Ancak kiraz karidesleri ile yapılan çok az sayıda bilimsel araştırma bulunmaktadır. Bu çalışmada, farklı (Spirulina katkılı, granül, pul, çubuk) ticari yemlerin kiraz karideslerinde büyüme ve gelişimleri üzerine etkileri araştırılmıştır. Araştırmada, akvaryum sektöründe yaygın olarak kullanılan pul, çubuk ve granül formdaki yemler kullanılmıştır. Çalışma 12 adet 50 L’lik cam akvaryumda 3 tekrarlı olarak yürütülmüştür. Karidesler gruplar halinde yaşadıklarından dolayı her bir akvaryuma ortalama 0,30±0,01 g ağırlığında ve ortalama 1,40±0,01 cm total boyda 30 adet birey stoklanmıştır. Karidesler 16 hafta boyunca doyana kadar beslenmiştir. Çalışma sonunda tüm gruplar arasında canlı ağırlık ve total boylar karşılaştırıldığında istatistiksel olarak farklılık ortaya çıkmıştır (P

The effect of density on growth, sex ratio, survival, and biochemical composition of the red cherry shrimp, Neocaridina davidi Bouvier, 1904, was studied to determine optimum rearing conditions in this ornamental species. It was tested whether gender segregation affected growth and survival of the species. To test the effect of density (Experiment 1), hatched juvenile shrimp were kept at three different densities: 2.5, 5, and 10 individuals l-1 (D2.5, D5 and D10, respectively). To test the effect of gender segregation (Experiment 2), 30-day juveniles were reared in three conditions: culture with only females, culture with only males, and mixed culture (females: males 1:1) at 5 individuals l-1 density. Experiments lasted 90 days, and shrimp were weighted either every 30 days (Experiment 1) or 15 days (Experiment 2). At day 90, females kept at D2.5 weighted 45% more than females stocked at D10 (P < 0.05), whereas females from D5 0.05). Males at D2.5 weighted 29% more than D510 (P < 0.05). Survival was high and unaffected by treatment. Sexual differentiation did not differ among treatments. Females from D2.5 had the lowest lipid and protein content, which would occur if they had a higher spawning. Males from D2.5 had higher content of proteins, probably due to their larger size. Gender segregation had no effect over growth and survival; females grew up to a larger size than males both in monosex and mixed culture. It was shown that given to their non-aggressive behavior, N. davidi is tolerant to a highdensity condition, which makes it feasible as an ornamental species., Instituto de Limnología "Dr. Raul A. Ringuelet"

This study evaluated the starvation resistance of the shrimp Neocaridina davidi during the first and the third juvenile stages (named here as JI and JIII) by means of the estimation of point-of-no-return (PNR50). Two experiments were conducted with increasing numbers of days without food and two controls (one with continuous feeding, CF; the other, with continuous starvation, CS). Time to the first molt and number of molts did not differ among the treatments beginning at JI or JIII. Nevertheless, longer periods of starvation influenced growth and survival of juveniles beginning the starvation as JI, but these effects were not observed in JIII. The estimated values of PNR50 for JI and JIII were 16.15 ± 0.31 and 9.44 ± 0.26 days, respectively. The early stages of the life cycle are more tolerant to starvation than other decapods previously studied. Such ability indicates a great potential of this species for aquaculture. Fil: Pantaleão, João Alberto Farinelli. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Barros Alves, Samara de P.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Tropea, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina Fil: Alves, Douglas F. R.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Negreiros Fransozo, María Lucía. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Lopez, Laura Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina

The effect of water temperature on biochemical composition, growth and reproduction of the ornamental shrimp, Neocaridina heteropoda heteropoda, was investigated to determine the optimum temperature for its culture. The effect of embryo incubation temperature on the subsequent performance of juveniles was also evaluated. Ovigerous females and recently hatched juveniles (JI) were maintained during egg incubation and for a 90-day period, respectively, at three temperatures (24, 28 and 32°C). Incubation period increased with decreasing water temperature, but the number and size of JI were similar among treatments. At day 30 of the 90-day period, body weight and growth increment (GI) at 24°C were lower than those at 28 and 32°C. On subsequent days, GI at 24°C exceeded that at 28 and 32°C, leading to a similar body weight among treatments. These results suggest growth was delayed at 24°C, but only for 30 days after hatching. The lipid concentration tended to be lowest, intermediate and highest at 28, 32 and 24°C, respectively, possibly as a consequence of the metabolic processes involved in growth and ovarian maturation. Protein and glycogen concentrations were similar among treatments. Both the growth trajectory and biochemical composition of shrimps were affected by the temperature experienced during the 90-day growth period independently of the embryo incubation temperature. During the growth period, shrimps reached sexual maturity and mated, with the highest proportion of ovigerous females occurring at 28°C. All the females that matured and mated at 32°C lost their eggs, indicating a potentially stressful effect of high temperature on ovarian maturation. Based on high survival and good growth performance of shrimps at the three temperatures tested over the 90-day period it is concluded that N. heteropoda heteropoda is tolerant to a wide range of water temperatures, with 28°C being the optimum temperature for its culture. Fil: Tropea, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina Fil: Stumpf, Liane. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina Fil: Lopez, Laura Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina

The red cherry shrimp RCS Neocaridina davidi is a tiny shrimp that has a bright red color; therefore, it has become a popular ornamental species. The aims of this study are to determine the fecundity, egg size, and maturation time of the RCS at different sizes and also to determine its ovarian maturity criteria. A total of 18 adult female shrimps in 3 different size groups based on carapace length were used. They were grouped as small S: 1.5-1.7 cm , medium M: 1.8-2.0 cm , and large L: 2.1-2.3 cm ; a total of 36 adult male shrimps 1.5 ± 0.2 cm were used in the research. The parameters observed in this study were fecundity, size of the egg diameter , and gonadal maturity of the female. The L-size group of the RCS obtained the highest fecundity, the highest uniformity of egg size, and the fastest maturation period, so it can be concluded that the best reproductive performance was observed in the L-size group of RCS. We also determined 4 ovarian maturity criteria of the RCS so that they can be used for production efficiency, in further research, and for its culture.