Predatory reactions of juvenile stages of sea trout (Salmo trutta trutta L., ۱۷۵۸) fed with three feeding regimens

Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_JIFRO-19-1_014

تاریخ نمایه سازی: 27 بهمن 1400

Abstract:

Restocking is used in rivers to restore fish populations. The biological value of stocking material derived from hatcheries is low, which is reflected in low survival rate in natural environment after stocking. For this reason, in pre-rearing, attention is increasingly paid to minimize the undesired hatchery-rearing effects, which greatly reduces the biological value. The quality of stocking material can be improved by introducing live food to the diet. The aim of the study was an attempt to determine the biological quality of trout larvae reared in three feeding regimens by determining the predatory behavior. The experiment started with a ۳۰-day rearing of fish in three feeding variants: starter feed and algae, starter feed, and live brine shrimp larvae. Best weight and length gain of the fish and the survival rate were recorded in the group of fish fed exclusively Nutra HP ۰.۳ starter feed (Skretting). Pre-reared larvae of sea trout from three feeding variants were released in reservoirs, in which ide Leuciscus idus  larvae were introduced as live food. It was observed that sea trouts most effectively caught their prey in a variant, in which sea trout larvae had been previously fed brine shrimp larvae, Artemia sp. The results indicate that the type of first food can model the predatory behavior of juvenile stages of sea trout.  

Keywords:

Sea trout Salmo trutta trutta , Fish larvae rearing , Foraging ability , Behavior

Authors

K. Ciszewski

Department of Fisheries Management, West Pomeranian University of Technology in Szczecin, K. Królewicza Street ۴, ۷۱-۵۵۰ Szczecin, Poland

P. Czerniejewski

Department of Fisheries Management, West Pomeranian University of Technology in Szczecin, K. Królewicza Street ۴, ۷۱-۵۵۰ Szczecin, Poland

W. Wawrzyniak

Department of Fisheries Management, West Pomeranian University of Technology in Szczecin, K. Królewicza Street ۴, ۷۱-۵۵۰ Szczecin, Poland

O. Surma

The State Higher Vocational School in Konin, Przyjazni Street ۱, ۶۲-۵۱۰ Konin, Poland

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