Reproductive performance of fairy shrimpBranchinecta orientalis(G. O. Sars 1901) (Crustacea: Anostraca), fed with effluent of rainbow troutOncorhynchus mykiss(Walbaum 1792) ponds

Abstract

Aquaculture production is predicted to increase sharply. In this regard, live feed plays a crucial role in the larval phase of many aquaculture organisms. Hence, a persistent concern in aquaculture is to find low‐cost and eco‐friendly feed sources to culture live feed organisms. Branchinecta orientalis (G. O. Sars 1901), a fresh/brackish water fairy shrimp, was reared using effluent from rainbow trout Oncorhynchus mykiss (Walbaum 1792) ponds, either fresh but supplemented with two species of microalgae, Scenedesmus sp. and Haematococcus sp., or non‐supplemented but after “ageing” of the culture medium. The feeding experiment was designed at a density of 100 individuals L−1 in 2‐L vessels. The results indicated that differences between final length, survival and most reproductive parameters of the treatment with aged medium and the treatment using fresh medium supplemented with Scenedesmus sp. were non‐significant (p > .05). Better results were obtained for a number of reproductive parameters in the treatment supplemented with Haematococcus sp. Thus, for intensive resting egg production of B. orientalis, microalgae can be replaced by aged non‐supplemented effluent from trout ponds as a nutrient‐rich feed source. This consequently can reduce drainage of nutrients into the environment and thus decrease aquatic pollution.

An Endeavor to Find Starter Feed Alternatives and Techniques for Zebrafish First-Feeding Larvae: The Effects on Viability, Morphometric Traits, Digestive Enzymes, and Expression of Growth-Related Genes

“…34 In our laboratory the three freshwater ALG (CV, SO, and HP) are used to feed B. orientalis, and their mass-culture protocols are available. 35,36,37 The presence of ALG in the digestive tract of the larvae (Fig. 4ab) indicates that they have an appropriate size and are attractive to the larvae.…”

“…88 The igf2a acts through a conserved signaling pathway that regulates growth, development, metabolism, and longevity in a wide variety of animals. 37 In zebrafish, mRNA expression of the igf2a is observed in embryonic. 87,89 The nutritionally induced changes in igf2a expression level in zebrafish larvae at 11 dpf in the present study (Fig.…”

“…30,34 In mariculture, ALG are also used to produce mass quantities of zooplankton (rotifers and Artemia) which serve as food for larval and early-juvenile stages of fish. 30,34 In Urmia University freshwater ALG are used to produce a freshwater zooplankton fairy shrimp Branchinecta orientalis, 35,36,37 as a potential live food for zebrafish.…”