Digestive tracts of wild guppies, Poecilia reticulata (Pisces, Poeciliidae) contained mainly benthic algae and invertebrates. In the laboratory, guppies matured on diets consisting solely of Chlorococcum (Chlorophyceae), Daphnia, or dried fish food, but rates were slowest on algae. Fish grazing benthic algae performed rapid pecks with jaws maximally protracted to cover a relatively large area. Pecks were performed in series at intervals of 0.55 s. Jaw movements required 0.17 s, while substrate contact lasted 0.03 s. Ingestion/peck varied with fish size, sex and algal density. Males fed on lower densities and ingested more per peck than females of similar weight. Ingestion rates were high and showed no consistent daily pattern. Females had longer feeding bouts than males. / Dans la nature, l’appareil digestif du guppy, Poecilia reticulata (Pisces, Poeciliidae), contient principalement invertébrés et algues benthiques. En laboratoire, le taux de croissance des guppys nourris avec Chlorococcum (Chlorophyceae) fut plus lent que celui des poissons nourris avec la nourriture sèche ou des Daphnia. Les poissons se nourissant d’algues, accomplissent des mouvements d’ingestion rapides, avec leurs mâchoires maximalement ouvertes pour couvrir le plus d e sur f ace possible. Ce s mouvements se répétent en série, a intervalles de 0.55 s. Le mouvement d’ouverture des mâchoires dure 0.17 s, le temps de contact avec le substrat 0.03 s. Le rapport ingestion/bouchée varie avec la taille du poisson, son sexe et la densité des algues. Les mâles se nourrissent sur des plus faibles densités et ingérent plus par bouchée que les femelles du même poids. Les taux d’ingestion sont élevés et ne suivent pas de cycles journaliers. Les femelles ont des périodes d’ingestion plus longues que les mâles. fr

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In order to describe the ontogeny of solid food consumption by pigs and determine its influence on weight gain, before and after an abrupt weaning at 4 weeks of age, individual feed consumption was measured using a technique that combined load cells and video images. Feed consumption varied greatly both between and within litters. Within litters, consumption was positively correlated with birth weight, and with early weight gains. This suggests that greater feed intake was typical of larger and more mature pigs rather than reflecting compensation for poor milk intake by smaller litter-mates. Within-litter differences in weight gain during the two weeks after weaning were positively correlated with birth weight but not correlated with pre-weaning creep feed intake. Creep feed intake appeared to contribute to pre-weaning gains and these were correlated with post-weaning gains; however a more direct affect on post-weaning gain could not be detected.

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<p>Beach-cast kelp (the most widely used feed for commercially grown South African abalone) is plentiful during winter months when periodic storms cause kelp to wash ashore. During summer, however, this resource is not always readily available and farmed abalone are often starved for short periods. The aim of this research was to assess how periodic kelp starvation influences growth of the commercially grown abalone, Haliotis midae Linnaeus.</p>

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