Effects of size heterogeneity, feeding/fasting strategy and stocking density modulation on body performance and cannibalism rate of Persian sturgeon (Acipenser persicus) larvae

Growth

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performance

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, survival or/and cannibalism

rate

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of

larvae

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are directly affected by feeding strategies, hatchery management, etc. (Mohler, King, & Farrell, 2000; Deng et al., 2003; Leu et al., 2018; Uriarte et al., 2019) and

thus

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knowing these key factors for

sturgeon

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larviculture helps farmers to provide an appropriate condition. There are, though, a few studies on how

sturgeon

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larviculture can be influenced by feeding/fasting, size sorting and stocking

density

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. It is the

first

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time given cannibalism nature of Persian

sturgeon

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larvae

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has been reported. The

growth

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and survival

rate

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drawn from

this

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study have been proved by previous documents regarding fish feeding frequency. In

this

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study, having the feeding/fasting strategy been considered initial factor on final

weight

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of the

larvae

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, it would be logical why in all starved treatments survival

rate

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, in both hetero & homo-size conditions, is increased.

Besides

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this

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, the starvation sterategy has resulted in adverse effect on final

weight

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when stocking densities were raised by two-fold. It is

therefore

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can reach around six-times in the homo-size small

larvae

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(B6: 39.3 ± 11.3 mg) and four-times in homo-large (B4: 98.6 ± 30.4 mg) and hetero-small (B2: 80.3 ± 19.6 mg) treatments. The effect of feeding on final

weight

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and mortality of

sturgeon

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, previously, is well-defined in Siberian

sturgeon

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(Gisbert & Williot, 1997) and white

sturgeon

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(Deng et al., 2003). The persian

sturgeon

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function

therefore

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alter depending on overcrowding situation.

This

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is to say, the more fish maintained starved in high

density

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the higher mortality

rate

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would be seen. Predicted that the reduction of

growth

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performance

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in aquatic, during

larvae

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phase

in particular

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, it would cause by competition either for feeding or for space (Bolasina et al., 2006; Lee et al., 2016; Yadata et al., 2019).

Larvae

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maintained at high stocking

density

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require more food availability to have an optimal final

weight

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.

Although

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stocking

density

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clearly influences Amur

sturgeon

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(Ni, Wen, Li, Chi, Bu, Ren, Zhang, Song, & Ding, 2014), Atlantic

sturgeon

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Acipenser oxyrinchus (Mohler et al., 2000) and Chinese

sturgeon

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Acipenser sinensis (Ni, Wen, Li, Chi, Bu, Ren, Zhang, Song, & Ding, 2016) by provoking

growth

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performance

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, the nature of species can opt how body

performance

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react in different stocking

density

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(Millán-Cubillo, Martos-Sitcha, Ruiz-Jarabo, Cárdenas, & Mancera, 2016). .