scholarly journals Effect of stocking density on growth, survival and development of aspAspius aspius(L.), ideLeuciscus idus(L.) and chubLeuciscus cephalus(L.) larvae during initial rearing under laboratory conditions

2011 ◽  
Vol 10 (3) ◽  
pp. e34 ◽  
Author(s):  
Krzysztof Kupren ◽  
Daniel Żarski ◽  
Sławomir Krejszeff ◽  
Dariusz Kucharczyk ◽  
Katarzyna Targońska
Keyword(s):  
Stocking Density ◽  
Laboratory Conditions ◽  
Survival And Development

Effects of Salinity on Snow Crab (Chionoecetes opilio) Larval Survival and Development under Laboratory Conditions

2015 ◽  
Vol 34 (2) ◽  
pp. 499-504 ◽  
Author(s):  
Takeo Yamamoto ◽  
Tatsuya Yamada ◽  
Hiroshi Fujimoto ◽  
Katsuyuki Hamasaki
Keyword(s):  
Larval Survival ◽  
Snow Crab ◽  
Chionoecetes Opilio ◽  
Laboratory Conditions ◽  
Survival And Development

scholarly journals Improvement of survival and development of Pacific white shrimp Litopenaeus vannamei larvae by feeding taurine enriched rotifers

2015 ◽  
Vol 10 (2) ◽  
pp. 131 ◽  
Author(s):  
Dedi Jusadi ◽  
Syarifah Ruchyani ◽  
Ing Mokoginta ◽  
Julie Ekasari
Keyword(s):  
Litopenaeus Vannamei ◽  
Stocking Density ◽  
Larval Survival ◽  
Pacific White Shrimp ◽  
White Shrimp ◽  
Naupliar Stage ◽  
Fibre Glass ◽  
Taurine Concentration ◽  
Taurine Level ◽  
Survival And Development

<p>ABSTRACT</p><p><br />The objective of the present experiment was to study the most optimum taurine enrichment concentration of rotifers in improving Pacific white shrimp larva Litopenaeus vannamei survival and development. White shrimp larvae at sixth naupliar stage were reared in 12 units of 500 L fibre glass tanks with a stocking density of 125 ind/L. Starting from zoea two stage (Z-2), the larva was provided with rotifers with different taurine enrichment concentration according to the treatments, i.e. 0 mg/L enrichment medium (A), 25 mg/L (B), 50 mg/L(C), and 100 mg/L (D). The results show that different taurine concentration in the enrichment media increased taurine level in rotifers. Furthermore, the administration of taurine enriched rotifers up to 50 mg/L significantly improved larval survival and may accelerate larval development. The experimental results also concluded that a concentration of 50 mg/L is the most optimum taurine enrichment concentration of rotifers for the improvement of white shrimp larval survival and developmental stage.</p><p><br />Keywords: taurine, rotifer, white shrimp, enrichment</p><p><br />ABSTRAK<br />Penelitian ini bertujuan untuk mengkaji konsentrasi optimum taurin melalui pengayaan pada rotifera terhadap tingkat kelangsungan hidup dan perkembangan stadia larva udang vaname Litopenaeus vannamei. Larva udang vaname stadia naupli-6 dipelihara dalam 12 tangki fiberglass volume 500 L dengan kepadatan 125 ind/L. Dimulai sejak stadia zoea 2 (Z-2) larva diberi rotifera yang diperkaya dengan taurin dengan konsentrasi yang berbeda sesuai dengan perlakuan, yaitu 0 mg/L media pengkaya (A), 25 mg/L (B), 50mg/L (C), dan 100mg/L (D). Hasil penelitian menunjukkan pengayaan taurin pada konsentrasi yang berbeda menyebabkan peningkatan kandungan taurin rotifera. Sementara pemberian rotifera yang diperkaya taurin hingga 50 mg/L meningkatkan kelangsungan hidup dan mempercepat perkembangan stadia larva udang. Berdasarkan hasil penelitian ini dapat disimpulkan bahwa pemberian rotifera yang diperkaya taurin dengan konsentrasi 50 mg/L menghasilkan tingkat kelangsungan hidup tertinggi (53,5%) dan perkembangan larva yang tercepat (p&lt;0,05) dibandingkan perlakuan lainnya.<br /><br />Kata kunci: taurin, rotifera, udang vanname, pengayaan</p>

scholarly journals Ectoparasitic fungi of Myrmica ants alter the success of parasitic butterflies

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
András Tartally ◽  
Norbert Szabó ◽  
Anna Ágnes Somogyi ◽  
Ferenc Báthori ◽  
Danny Haelewaters ◽  
...  
Keyword(s):  
Parasite Species ◽  
Joint Infection ◽  
Laboratory Conditions ◽  
Myrmica Ants ◽  
Survival And Development ◽  
Myrmica Scabrinodis ◽  
Rickia Wasmannii

AbstractExploitation of organisms by multiple parasite species is common in nature, but interactions among parasites have rarely been studied. Myrmica ants are rich in parasites. Among others, the ectoparasitic Rickia wasmannii fungus and the parasitic caterpillars of myrmecophilous Phengaris butterflies often infect the same Myrmica colonies. In this study, we examined the effects of R. wasmannii on the adoption, long-term development, and survival of P. alcon. In laboratory conditions, caterpillars introduced into nests of Myrmica scabrinodis uninfected with R. wasmannii survived significantly longer compared to caterpillars introduced into infected nests. In the field, joint infection was less common than expected if both parasites exploited M. scabrinodis colonies independently. Pre-pupal caterpillars of P. alcon were somewhat larger in nests infected with R. wasmannii than those found in uninfected nests. Based on these results it seems that R. wasmannii infection of M. scabrinodis affects the survival and development of P. alcon caterpillars, suggesting competition between these two ant parasites.

scholarly journals Preference for microhabitat by Monogenea on the gills of the south american catfish Rhamdia quelen at different stocking densities under laboratory conditions

2016 ◽  
Vol 53 (1) ◽  
pp. 55-61 ◽  
Author(s):  
J. A. Debortoli ◽  
A. C. F. Lacerda ◽  
T. R. Lisboa ◽  
M. L. Martins
Keyword(s):  
Parasitic Infection ◽  
Stocking Density ◽  
Abundant Species ◽  
South American ◽  
Dorsal Region ◽  
The South ◽  
Microhabitat Preference ◽  
Laboratory Conditions ◽  
Rhamdia Quelen

SummaryThis study aimed to verify preferences for microhabitat by the monogeneans on the gills of the south american catfish, Rhamdia quelen (Quoy & Gaimard, 1824), at different stocking densities under controlled laboratory conditions. Three stocking densities were used: 14, 28 and 42 fish per tank (50 L) and the fish were sampled initially, at day 5 and 10 of the experiment. Aphanoblastella mastigatus (Suriano, 1986) was noted as the most abundant species at all stocking densities, except for the initial collection day. The gill arches I and II were the most parasitized, showing the highest mean abundance in the dorsal region, at the highest density. The pattern of microhabitat preference of A. mastigatus for outer regions of the gills of the host was independent of the stocking density and collection day. Higher prevalence and abundance of Scleroductus sp. at the initial collection reflected the parasitic infection of the fish at the farm from where the fish were taken. The abundance of Scleroductus sp. decreased along the experiment, and no preference for gill arches was recorded for the species, probably due to the low abundance of this parasite on the gills.

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