A subsidiary of Teledyne Technologies Inc. has received a $7 million contract from the National Oceanic and Atmospheric Administration to provide equipment used in the study of the krill population in Antarctica. The initial purchase of Slocum gliders, sensors and service components from Teledyne Webb Research, in North Falmouth, Mass, will be in excess of $600,000. Teledyne Webb is a division of Teledyne Technologies, in Thousand Oaks. The gliders and sensors will be used in a survey program by the NOAA Fisheries Service to help establish catch limits for the Antarctic krill fishery by the Convention for the Conservation of Antarctic Marine Living Resources. Krill is a small crustacean that is a key species in the Antarctic ecosystem and a food source for whales, seals, penguins, other sea animals and many species of birds. Shares closed down $2.77, or more than 1 percent, to $242.73 on the New York Stock Exchange.