OBJECTIVES AND SETTING Injuries from in-line skating have risen sharply in many cities around the world. To understand risk taking behavior and safety practices associated with urban in-line skating, 2210 outdoor skaters were observed in Boston, Massachusetts. METHODS Estimated age, gender, use of helmets, wrist guards, elbow and kneepads were recorded. Skaters were coded as beginner, average...

Sharks can use their electrosensory system to detect electric fields in their environment. Measurements of their electrosensitivity are often derived by calculating the voltage gradient from a model of the charge distribution for an ideal dipole. This study measures the charge distribution around a dipole in seawater and confirms the close correspondence with the model. From this, it is possibl...

Aquaponic fish to plant ratios, or more correctly, aquaponic feeding rate ratios, are an area of aquaponics that have been much debated. There seems to be many approaches to sizing the two main components of aquaponic systems (the fish component and the plant component), whether in a hobby-scale context or a commercial-scale context. I often say that ratios are the “Golden egg” of aquaponics as...

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A long-standing question in community ecology is whether food webs are organized in compartments, where species within the same compartment interact frequently among themselves, but show fewer interactions with species from other compartments. Finding evidence for this community organization is important since compartmentalization may strongly affect food web robustness to perturbation. However...

Daye, P. G. 1980. Effects of ambient pH on fish: an annotated bibliography. Can. Tech. Rep. Fish. Aquat. Sci. 950, 111 + 28 p. An annotate>d bibliography on the t>ffects of ambie>nt presented in alphabetical sequence according to author. and geographical listings. pH on fish, consisting of Jlli citations, is These references are also cross-in<h~x~..~d by suhjt~ct

Sharks are a globally threatened group of marine fishes that often breed in their natal region of origin. There has even been speculation that female sharks return to their exact birthplace to breed ('natal philopatry'), which would have important conservation implications. Genetic profiling of lemon sharks (Negaprion brevirostris) from 20 consecutive cohorts (1993-2012) at Bimini, Bahamas, sho...

The North Atlantic is a productive marine region which has supported important commercial fisheries for centuries. Many of these fisheries have exploited the pelagic species, including herring, blue whiting and tuna. Here we present data on the distribution of herring and blue whiting based on the international ecosystem survey in the Nordic Seas (IESNS), the bottom trawl survey in the Bay of B...