Abstract
We evaluated the growth and diet composition of hybrid surubim larvae (Pseudoplatystoma corruscans x P. reticulatum) produced in two fish farming by using different systems of feeding with natural plankton: M I, larvae are transferred to fertilized fish pond for being freely fed with natural plankton; M II, larvae are remained inside laboratory in glass fiber boxes and plankton are gathered with a plankton net and offered in a controlled way. It was collected 10 individuals daily during the feeding period with live plankton for 20 days. After the biometry, stomachs were opened and the food items identified and quantified by the volumetric method. The items were represented by algae, protozoa, microcrustacean, insect larvae and surubim fragments (cannibalism). The items with higher volumetric percentage were Chironomidae larvae (29.25%) followed by surubim fragments (19.68%) in M I, and surubim fragments (21.85%) and Moina micrura (19.97%) in MII. The items Chydorus sp., Diaphanosoma sp., sp. Macrothrix and Ephemeroptera larvae were found only in fish of M I, while algae Ulothrix sp., Oscillatoria sp. and the protozoa Difflugia sp were only found in stomachs of surubim from M II. Regarding the growth, the surubim had grown faster in M I.
Highlights
Fish early life stage, technically named larval stage, is an important phase for determining the survival percentage of fish spawning (FILIPETTO et al, 2005)
This study aimed to evaluate the diet composition related to larvae growth of hybrid surubim Pseudoplatystoma corruscans vs P. reticulatum produced in two fish farmings that employ different techniques of feeding management during the larvae feeding stage by using natural plankton
Samplings were undertaken in the period of natural reproduction occurring from September 2008 to February 2009 in two commercial fish farmings: one located in Dourados city (M I) and another near Terenos city (Mato Grosso do Sul State, Brazil) (M II)
Summary
Technically named larval stage, is an important phase for determining the survival percentage of fish spawning (FILIPETTO et al, 2005). In this period, the natural food contributes with essential nutrients of high biological values, ensuring its development and. In this way, the supply of a high nutritional value food is extremely important for a satisfactory growth (FURUYA et al, 1999). Studies based on stomach content analysis have based the knowledge of food sources used by fish, and can provide data about habitat, food availability in the environment and even some aspects of behavior (DAJOZ, 1983).
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