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    Ecological stoichiometry of macroalgae from Sinop Peninsula coast of Black Sea, Türkiye: characterization of C:N:P
    (Springer, 2025) Yildiz, Gokhan; Karacuha, Ali
    This comprehensive ecological investigation systematically analyzed the temporal and spatial variations in carbon (C), nitrogen (N), and phosphorus (P) concentrations across diverse macroalgal assemblages inhabiting the upper infralittoral zone of the Sinop peninsula. The study encompassed seasonal sampling conducted at five distinct stations between October 2019 and July 2020, targeting nine prevalent macroalgal species representing three major taxonomic groups: Chlorophyta, Rhodophyta, and Phaeophyceae. Statistical analyses revealed statistically significant (p < 0.05) variations in mean elemental concentrations across seasonal, regional, and species-specific dimensions. The elemental concentration ranges demonstrated substantial diversity, with carbon concentrations spanning from 14.73% in Corallina officinalis to 43.04% in Pterocladiella capillacea. Nitrogen concentrations exhibited remarkable variability, ranging from 0.50% in C. officinalis to 5.14% in Ceramium spp., while phosphorus concentrations varied from 0.02% in Ceramium spp. to 0.32% in Ulva rigida. The elemental ratio analyses uncovered intricate inter-specific variations, with carbon/phosphorus ratios ranging from 157 in C. officinalis to 4255 in Laurencia obtusa, nitrogen/phosphorus ratios varying from 9 to 304, and carbon/nitrogen ratios spanning from 9 to 51. Taxonomic group-level analyses revealed nuanced nutritional characteristics, with nitrogen concentrations showing slight variations across green (1.98%), brown (1.76%), and red (2.20%) algae, and phosphorus concentrations exhibiting similar patterns across these taxonomic groups. The macroalgal community presented a mean C:N:P atomic ratio of 1187:57:1, with a median ratio of 859:41:1. These stoichiometric signatures predominantly indicate phosphorus limitation across the studied macroalgal assemblages along the Sinop coastal region, with C. officinalis emerging as a notable exception.
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    MACROALGAE AND PHANEROGAMS OF THE BLACK SEA
    (Turkish Marine Research Foundation-Tudav, 2017) Karacuha, Ali; Okudan, Emine Sukran
    [No abstract available]
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    The effects of dietary supplement of rounded brittle fern weed (Laurencia obtusa) (hudson) (j.v.lamouroux, 1813) as a natural carotenoid on pigmentation in rainbow trout (oncorhynchus mykiss)
    (Central Fisheries Research Institute, 2018) Baki, Birol; Kerim, Murat; Ozturk, Dilara Kaya; Eyuboglu, Bora; Karacuha, Ali
    The aim of this study was to determine the effects of Laurencia obtusa (Hudson) as a natural carotenoid on the growth performance, biochemical composition and skin and fillet pigmentation in rainbow trout (Oncorhynchus mykiss). Laurencia obtusa was collected manually from the shores of Sinop (The Black Sea-Turkey) and included in the diet at two different ratios as 30 (L30) and 60 (L60) mg/kg diet. The fish with an average weight of 248.9±6.1 g were fed by the experimental diets for 6 weeks. The best growth performance was determined in L0. The differences between protein, fat and ash values of fish were not significant (P>0.05). At the end of the study, the L* value was highest in the L0 group (59.94±1.28) and lowest in the L60 group (53.43±1.98) and, in fillet, it decreased in all experimental groups compared to the initial values (P<0.05). The a* values of skin and fillet were determined between 4.48±0.31 and 4.68±0.41, 1.45±0.42 and 1.73±0.39, respectively (P>0.05). The b* value increased in all groups in skin (P<0.05), whereas it was decreased in fillet (P>0.05). © 2018, Central Fisheries Research Institute. All rights reserved.
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    The Effects of Different Carotenoid Sources on Skin Pigmentation of Goldfish (Carassius auratus)
    (Israeli Journal Of Aquaculture-Bamidgeh, 2011) Yesilayer, Nihat; Aral, Orhan; Karsli, Zafer; Oz, Meryem; Karacuha, Ali; Yagci, Feraye
    The aim of this study was to investigate the effect of different carotenoid sources on goldfish (Carassius auratus) skin pigmentation. The value of goldfish depends on the intensity of the skin color. In the red variety of goldfish, an orange-red hue is desirable. Juvenile goldfish were fed one of five diets for five months to determine the effects of carotenoids on skin pigmentation, growth, feed efficiency, and survival: (1) astaxanthin (carophyll pink at 75 mg/kg), (2) canthaxanthin (carophyll red at 75 mg/kg), (3) Gammarus spp. (75 mg/kg), (4) Oleoresin paprika (180 mg/kg), and (5) an unsupplemented control. Growth and feed efficiency did not significantly differ among groups. Initial and final samples of head skin were measured by colorimetric analysis for lightness (L*), redness (a*), yellowness (b*), hue (H-ab(o)), and chroma (C-ab*). The best red color (a* and H-ab(o)) was obtained with the astaxanthin, canthaxanthin, and paprika diets.
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    The influence of livefeed supplementation on growth and reproductive performance of guppies (Poecilia reticulata Peters, 1859) broodstock
    (Ege Univ, 2008) Karacuha, Ali; Aral, Orhan
    In this study, the effects of feeding with five different feeds (Artemia sp., Daphnia sp., aquarium fish food + Artemia sp., aquarium fish food + Daphnia sp., aquarium fish food) on growth and fecundity of guppies broodstock (Poecilia reticulata Peters, 1859) with a mean initial weight of 0.924 g were investigated with three replications. The experiment was designed as five treatment with 15 groups except control and the trial lasted 12 weeks. Between the groups, fish fed with artemia supplement to aquarium fish food were obtained the best growth (weight, lenght, spesific growth rate) and fecundity performance. The results, among the groups, were statistically significant (p<0,05). However, a linear relationship was demonstrated between fecundity and weight (r=0.91) with length (r=0.90) of female broodstock fish.