170,477 research outputs found
Feeding Behaviour, Swimming Activity and Boldness Explain Variation in Feed Intake and Growth of Sole (Solea Solea) Reared in Captivity
No full textThe major economic constraint for culturing sole (Solea solea) is its slow and variable growth. The objective was to study the relationship between feed intake/efficiency, growth, and (non-) feeding behaviour of sole. Sixteen juveniles with an average (SD) growth of 2.7 (1.9) g/kg0.8/d were selected on their growth during a 4-week period in which they were housed communally with 84 other fish. Selected fish were housed individually during a second 4-week period to measure individual feed intake, growth, and behaviour. Fish were hand-fed three times a day during the dark phase of the day until apparent satiation. During six different days, behaviour was recorded twice daily during 3 minutes by direct observations. Total swimming activity, frequency of burying and of escapes were recorded. At the beginning and end of the growth period, two sequential behavioural tests were performed: “Novel Environment” and “Light Avoidance”. Fish housed individually still exhibited pronounced variation in feed intake (CV = 23%), growth (CV = 25%) and behavior (CV = 100%). Differences in feed intake account for 79% of the observed individual differences in growth of sole. Fish with higher variation in feed intake between days and between meals within days had significantly a lower total feed intake (r = -0.65 and r = -0.77) and growth. Active fish showed significantly higher feed intake (r = 0.66) and growth (r = 0.58). Boldness during both challenge tests was related to fast growth: (1) fish which reacted with a lower latency time to swim in a novel environment had significantly higher feed intake (r = -0.55) and growth (r = -0.66); (2) fish escaping during the light avoidance test tended to show higher feed intake (
Comparing feed intake, utilization of protein and energy for growth and body composition in S. solea fed natural and commercial diets
No full textThe present work was carried out to study the effect of polychaete Nereis virens on feed intake, utilization of protein and energy for growth and body composition in sole (S. solea). It is hypothesized that intake, efficiencies of protein utilization and growth rates obtained for sole fed ragworm are comparable to those previously reported for S. solea. The mussel M. edulis was used as a reference diet to allow comparisons of present results with those obtained previously, which until today serve as reference for optimum growth in sole. Intake, efficiencies of utilization for protein and energy for growth and growth rates obtained for sole fed ragworm are expected to be higher compared to commercial feed. A commercial feed, commonly used for turbot but also in sole culture served as a second reference diet to discuss differences between natural and commercial feeds
Qualidade da solha selvagem e criada em circuito fechado e aberto
No full textMestrado em Ciências do Mar e Zonas CosteirasSoles (Solea spp) are a high-value commercial group of species with increasing importance in aquaculture. Common quality evaluation methods were used to compare Solea solea and Solea senegalensis sampled from the natural environment and fish farms. The aim was to develop a series of experiments and analysis of wild and farmed fish in Portugal, during 31 days, during boxed and iced storage. The analyses were performed using physical evaluations with Torrymeter type 295 and RT-Freshmeter type RT-2E, each 2 days and sensory evaluations using QIM (Quality Index Method), every day. The results show that farmed fish has a slower decrease in instrumentally-measured properties than the farmed, and QIM results show a loss in appearance more evident in the wild samples. For more accurate results, complementary analysis, like chemical, histological and microbiological, become necessary.As solhas (Solea spp) são um grupo de espécies de alto valor comercial com crescente importância na aquicultura. Métodos de avaliação da qualidade comuns em pescado foram usados para comparar a qualidade da solha. Solea solea e Solea senegalensis foram amostrados do ambiente natural e aquiculturas. Os peixes passaram por uma série de testes com o objetivo de analisar a sua qualidade. As amostras de peixes selvagens e de cultura, obtidas em Portugal, foram analisadas durante 31 dias, ao longo da sua degradação em caixas e em gelo moído. Foram feitas avaliações com os aparelhos Torrymeter 295 e RT-Freshmeter RT-2E, a cada dois dias, e avaliações sensoriais com o esquema QIM (Quality Índex Method), todos os dias. Os resultados mostram que os peixes de aquacultura têm uma perda mais lenta de qualidade do que os selvagens, em ambas as análises instrumentais, e nas análises do QIM mostram uma perda de qualidade na aparência mais evidente nos os selvagens. Para resultados mais precisos, análises complementares, como químicas, histológicas, e microbiológicas, tornam-se necessárias
Environmental timing and control of reproduction in the powan of Loch Lomond 'Coregonus lavaretus (L) (Teleostei)' in relation to its pineal organ
No full textThe reproductive cycle of Coregonus lavaretus (L. ) in Loch Lomond was
investigated by monthly sampling. The stages of the cycle occurred at the
same time each year and were precisely timed. The environment followed a
regular pattern which varied seasonally and was repeated annually. Spawning
synchrony within the population during the short breeding period may be in
response to lunar phases.
A qualitative echosounding survey was made. The spatial distribution of the
fish is probably related to their feeding behaviour and was mainly pelagic
in summer and benthic in winter. Diel vertical migrations were recorded at
dawn and dusk and appeared to be related to negative solar altitudes. The
fish occurred at the surface during the night and persisted with their diel
vertical migrations when feeding behaviour was benthic.
The regulation of the reproductive cycle in the common sole Solea solea
was investigated. The timing of spawning is ultimately determined by sea
temperature, and spawning synchrony within the population is probably
achieved in the initiation of exogenous vitellogenesis by a unified response
within the breeding population to a stimulatory photoperiod.
In both Solea solea and Coregonus lavaretus, initiation of exogenous
vitellogenesis occurred during a rapid rise in the condition of the fish.
The photosensitivity of the reproductive system may possibly be linked to
a threshold condition.
The pineal organ of Coregonus lavaretus is typically salmonid and the
convoluted epithelium contained photoreceptors, interstitial cells, and
neurones. The interstitial cells gave rise to processes which extended
into the perivascular space. Photoreceptor cells synapsed with neurones,
photoreceptor cells (lateral processes) and possibly other cell types.
The results suggest that the pineal organ functions as a photoreceptor
Solea solea solea
No full textSolea solea (Linnaeus, 1758) Sea of Marmara: 25800-702 (3 spc.), 17.04.1992, Front of Gönen Stream, trawl, 33 m, L. Eryilmaz. Mediterranean Sea: 25800-725 (1 spc.), October 2002, Iskenderun Bay, trawl, C. DalyanPublished as part of Nurettin Meriç, Lütfiye Eryilmaz & Müfit Özulug, 2007, A catalogue of the fishes held in the Istanbul University, Science Faculty, Hydrobiology Museum., pp. 29-54 in Zootaxa 1472 on page 5
Stock annex: Sole (Solea solea) in divisions 8.c and 9.a (Cantabrian Sea and Atlantic Iberian waters)
No full textWGBIE 2023 edit/update to stock annex for Sole (Solea solea) in divisions 8.c and 9.a (Cantabrian Sea and Atlantic Iberian waters).</p
Teleost fish (Solea solea): A novel model for ecotoxicological assay of contaminated sediments
No full textChemical analysis of sediment is not indicative of the downstream biological effects on aquatic organisms. In this study, the biological effects of sediment were examined using: Teleost fish (Solea solea), Artemia and rotifers. Although chemicals levels were below the limits permissible by Italian law, S. solea juveniles exposed to sediment (0.3%, w/v) for 96 h, revealed significant induction in the expression levels of HSP70, ERα, TRα, RXRα, PPARα, PPARβ, CYP4501A1 and CYP3A mRNAs, suggesting the utility of this species as a novel biosensor. The bio-toxicity of the sediment was further validated by exposing Artemia and rotifers to concentrations of elutriate (derived from the sediment) from 10 to 100% (v/v) (with a 50% mortality rate). These results suggest that sediment defined as moderately contaminated, solely on the basis of the chemical profile, may in fact cause harmful effects to aquatic organisms. This study highlights the need for biological approaches in the establishment of sediment toxicity levels
Determination of the free living stages of Caligus solea (Caligidae : copepoda) from common sole (Solea solea Linnaeus, 1758).
No full textTEZ12347Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 2017.Kaynakça (s. 63-57) var.XVII, 69 s. :_res. (bzs. rnk.), tablo ;_29 cm.Bu çalışmada, İskenderun Körfezi’nden yakalanan dil balıklarında enfestayon oluşturduğu belirlenen Caligus solea’nın, genel ve türe özgü yapılarının morfolojisi, serbest yaşam dönemi içerisinde yer alan evrelerin, yumurta gelişiminden itibaren parazitik yaşam dönemine geçiş evresi olan kopepodit evresine kadarki gelişim süreçleri ve incelenen her bir evrenin morfolojisi detaylı olarak belirlenmiştir. Bu amaçla, tezde yürütülen inceleme ve denemeler üç ayrı bölümde tamamlanmıştır. Birinci bölümde doğadan yakalanmış dil balıkları üzerinden örneklenen ergin C. solea bireylerinin türe özgü karakterleri taramalı elektron mikroskobu kullanılarak yeniden tanımlanmıştır. İkinci bölümde, yine doğadan örneklenen dişi C. solea bireylerinin yumurta gelişimi, açılımı ve serbest yaşam dönemi içerisindeki nauplius I,II ve kopepodit evrelerinin gelişim süreçleri belirlenmiştir. Üçüncü bölüm çalışmalarında ise, ikinci bölüm denemelerinden elde edilen larval evrelerin morfolojileri ilk kez tanımlanmıştır. Üç bölümden elde edilen verilere göre; ergin C. solea bireylerinin birinci yüzme bacağı morfolojisinin daha önceki literatür bilgisinden farklılık gösterdiği belirlenmiştir. Ayrıca, C. solea’nın 15°C su sıcaklığında 73 saat içerisinde yumurtadan çıktığı ve yumurta gelişiminden itibaren 45 saat sonra konağa bulaştığı evre olan, kopepodit aşamasına geçtiği belirlenmiştir.In this study, general morphology and the key diagnostic characters of Caligus solea, collected on wild common sole, Solea solea L., were studied together with the development of egg and free living stages. To accomplish this aim, necessary examinations and trials were carried out in three chapters. In the first chapter, morphology of the key diagnostic characters of adult female and male C. solea were re-examined and redescribed by using scanning electron microscope (SEM). In the second chapter, duration of egg and larval development within the free living stages (nauplii I, II and copepodid) of C. solea were determined. In the last chapter, morphology of the free living stages was decribed for the first time in detail. Depending on the results obtained from the studies conducted in these three chapters, it is determined that morphological differences than described in the original description of C. solea. In addition, the egg development within the egg sacs (time to first hatch at 15°C) was recorded as 73 h., the duration time from the beginning of the egg development to the infective copepodid stage was recorded as approximately 128 h.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: LY-2015-5195
Severe mortality in common sole (Solea solea) at post-weaning stage following environmental stress
No full textCommon sole (Solea solea) is one of the most interesting species for diversification of aquaculture
production in the Mediterranean area, but production of sole on an industrial scale has not yet
begun. In the present study, larval rearing was performed in 1 cubic meter tanks with a re-circulating
system, using the “green water” technique. Aer an initial mortality occurred during the first 10
days of larval rearing, no particular mortality was registered during weaning period until 69 dph
(day post hatching). On 66 dph, because of technical problems, fish were transferred in a new tank
with open system where temperature control was not possible and water temperature increased
from 19°C to 24 °C in three days. Four days later and for the following ten days we registered a
mortality rate of 84.5%. Microbiological analysis revealed the absence of Betanodavirus and the
presence of Vibrio anguillarum O2 and of Tenacibaculum maritimum; the former represents the first
isolation on common sole in Italy. Histology revealed necrotic-haemorrhagic lesions in brain,
kidney and gut, and severe skin erosions, the laer especially on fish collected at the end of the
outbreak. Moreover the pathogens have been detected by immunohistochemistry (IHC). This
severe mortality could be interpreted as a multi-factorial event where post-weaning weakness,
manipulation, higher temperature and pathogens could have had a synergic effect. The extreme
stress susceptibility of S. solea, pointed out in this and previous papers is discussed
Parasitic copepods of the common sole, Solea solea (L.), from the Eastern Mediterranean coast of Turkey
No full textThere is increasing interest in the common sole, Solea solea (Linnaeus), as an alternative fish species in aquaculture in the Mediterranean region, and parasitic copepods are a potential hazard for farmed finfish. This paper provides taxonomic information on two species of sea lice (family Caligidae) collected from S. solea in eastern Mediterranean waters off the Turkish coast. Caligus brevicaudatus A. Scott, 1901 and Caligus apodus (Brian, 1924) were both found and this is the first report of C. brevicaudatus in Turkish waters. The discovery of C. apodus on S. solea is a new host record. Key diagnostic characters of both species are reported, supported by light and scanning electron microscopy observations. During a 12-month survey a prevalence of 28% was recorded for C. brevicaudatus, whereas for C. apodus peak prevalence was much lower (3%). © 2013 Springer Science+Business Media Dordrecht
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