Sperm whales; (reports and papers on sperm whales from three meetings of the IWC Scientific Committee in 1977 and 1978)

animal physiology baleine ballena ciclo estral cycle oestral encuestas essaimage fishery resources fisiologia animal geographical distribution gestation mathematical models oestrous cycle physiologie animale pregnancy recursos pesqueros rendement rendimiento ressource halieutique surveys swarming whales yields