Growth and development time of subtropical Cladocera
                        <i>Diaphanosoma birgei</i> Korinek, 1981 fed with different
                    microalgal diets

Sipaúba-Tavares, LH.; Truzzi, BS.; Berchielli-Morais, FA.

doi:10.1590/1519-6984.12012

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Brazilian Journal of Biology

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Biology • Braz. J. Biol. 74 (2) • May 2014 • https://doi.org/10.1590/1519-6984.12012 copy

Growth and development time of subtropical Cladocera Diaphanosoma birgei Korinek, 1981 fed with different microalgal diets

Crescimento e tempo de desenvolvimento de uma espécie de Cladocera subtropical Diaphanosoma birgei Korinek, 1981 alimentada com dietas de microalgas.

Authorship SCIMAGO INSTITUTIONS RANKINGS

The aim of this work was to investigate the growth performance of Diaphanosoma birgei fed with two Chlorophyceae algae, Ankistrodesmus gracilis and Haematococcus pluvialis using monoalgal diets and simpler mixed diets. D. birgei was daily fed on four treatments: 1) 100% Ankistrodesmus gracilis (Ag); 2) 100% Haematoccocus pluvialis (Hp); 3) 25% A. gracilis + 75% H. pluvialis (Ag-25+Hp-75) and 4) 75% A. gracilis + 25% H. pluvialis (Ag-75+Hp-25). The fecundity curve of D. birgei showed that the mixed feed Ag-25+Hp-75 and temperature 24±2°C triggered fast fecundity at approximately two days. The fecundity was low when based only on H. pluvialis (Hp), albeit with greater longevity (19 days) and a higher number of broods (8). D. birgei fed on Ag and Ag-75+Hp-25 diets in this experiment sustained higher growth rate and higher lipid content in these treatments. The present study showed that A. gracilis diet and mixed microalgae diets tested were able to support the egg production and development of D. birgei.

Ankistrodesmus gracilis ; Haematococcus pluvialis ; monoalgal diets; mixed diets; growth rates

Life cycle characteristics	Diets
Life cycle characteristics	Ag	Hp	Ag-25+Hp-75	Ag-75+Hp-25
Intrinsic rate of increase (days)	0.20	0.11	0.19	0.21
Mean embryonic development time (hours)	47	33	33	33
Mean post-embryonic development time (days)	1.5	1.5	1.5	1.5
Mean fecundity (number of eggs per female)	15.7	5.35	14.2	11.8
Mean number of offspring per female	5.0	8.4	4.25	4.8
Longevity (days)	9.0	15.4	7.6	8.6
Mean length of neonate (µm)	403 (±61)^b	349 (±76)^c	414 (±77)^ab	440 (±44)^a
Mean length of primipara (µm)	439 (±74)^a	434 (±83)^a	491 (±99)^ab	517 (±59)^b
Mean length of adult (µm)	801 (±110)^b	690 (±158)^a	618 (±125)^c	739 (±65)^b
Dry weight of neonate (µg)	0.05	0.04	0.07	0.09
Dry weight of primipara (µg)	0.17	0.09	0.10	0.13
Dry weight of adult (µg)	0.26	0.35	1.2	0.38
Lipid (% dry weight)	7.02	5.58	5.28	7.31

Parameters	Diets
Parameters	Ag	Hp	Ag-25+Hp-75	Ag-75+Hp-25
pH	6.3 (±0.6)^a	6.3 (±0.5)^a	6.2 (±0.6)^a	6.2 (±0.6)^a
Conductivity (µS.cm^–1)	84 (±38)^a	86 (±38)^a	86 (±37)^a	90 (±45)^a
Dissolved Oxygen (mg.L^–1)	4.0 (±1.7)^a	6.4 (±2.4)^a	5.3 (±2.1)^a	4.9 (±1.6)^a
Ammonia (µg.L^–1)	173 (±8.3)^a	188 (±11)^a	185 (±20)^a	168 (±15)^a
Nitrate (µg.L^–1)	6.0 (±2.7)^a	4.5 (±2.1)^a	5.8 (±2.5)^a	6.2 (±2.5)^a
Nitrite (µg.L^–1)	6.0 (±2.9)^a	6.5 (±2.2)^a	6.7 (±2.2)^a	6.2 (±2.0)^a
Total Phosphorous (µg.L^–1)	41 (±13)^a	29 (±10)^a	32 (±7.5)^a	31 (±12)^a
Orthophosphate (µg.L^–1)	7.6 (±1.7)^a	6.7 (±2.1)^a	7.0 (±1.9)^a	6.7 (±2.2)^a
Chlorophyll-a (mg.L^–1)	52 (±25)^a	14 (±8.0)^b	21 (±8.1)^b	32 (±11)^ab

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