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• W2000238286 abstract "Ecologically, sea urchins are an important species in marine habitats around the world. Economically, sea urchins are prized for their gonads (uni). With fisheries declining worldwide, intensive sea urchin culture has been proposed. For urchins in commercial culture, any factor that affects survivorship negatively should be addressed to maximize cost benefit. One potential obstacle to optimizing culture of sea urchins is cannibalism. Approximately 2000 adult and juvenile Lytechinus variegatus (1 g–45 g) were collected from Port Saint Joseph Peninsula State Park, FL between June and September 2009. Urchins were held in recirculating tanks at different sizes, densities, and feeding regimes for 4 weeks. Starvation and high density contributed to the highest level of cannibalism among small (12–21 g) urchins (percent cannibalism = 18.8%), whereas fed, high density conditions contributed to the highest level of cannibalism among large (32–37 g) urchins (percent cannibalism = 18.4%). These results suggest that (1) small urchins cannibalize at higher rates than large urchins, and (2) increased density is an important contributing factor leading to cannibalism. We quantified stress, defined as a decrease in production as a result of environmental conditions, by evaluating weight gain within each treatment and suggest that weight loss or minimal weight gain is an indicator of stress. We hypothesize increased stress caused by competitive interference can lead to increased cannibalism and decreased growth rates, even when food is not limiting. Ecologically, there are no reports of cannibalism of urchins in wild populations. Consequently, the role of cannibalism in regulating sea urchin community structure is not known. However, factors affecting cannibalism of L. variegatus in the laboratory may provide insight into the conditions that could result in cannibalism in wild populations. From an aquaculture perspective, it is important to determine those factors that contribute to the incidence of cannibalism in sea urchins so that the appropriate culture conditions can be maintained to reduce the incidence of cannibalism." @default.
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• W2000238286 date "2011-03-01" @default.
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• W2000238286 title "Factors leading to cannibalism in Lytechinus variegatus (Echinodermata: Echinoidia) held in intensive culture" @default.
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• W2000238286 doi "https://doi.org/10.1016/j.jembe.2011.01.018" @default.
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