Improved survival, prey selectivity and diel feeding cycle of silver therapon Leiopotherapon plumbeus (Perciformes: Terapontidae) larvae reared in tanks with substrate

Aya, Frolan A.; Nillasca, Vicar Stella N.; Sayco, Mary Jane P.; Garcia, Luis Maria B.

doi:10.1007/s10228-018-0671-2

Cited by 8 publications

(9 citation statements)

References 30 publications

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“…Perhaps, too, the abrupt withdrawal of live food prey may not have been sufficient for early-stage silver therapon larvae to become familiar with the commercial powdered tilapia diet, such that as early as day 2 of feeding, already the survivorship of 8, 14 and 20 dph larvae began to decline until the end of the feeding period. In addition, the decline in survival rates among weaning age groups is attributed to cannibalistic behaviour as evident from the large variation in fish size, suggesting that the provision of physical substrate is necessary to potentially reduce or suppress aggression among large-size early silver therapon larvae (Aya et al, 2019;Näslund & Johnsson, 2016 Survival was improved when different weaning age groups of silver therapon larvae were subjected to different live co-feeding periods before being weaned to a commercial powdered prawn diet. This is in agreement with the study of García-Ortega et al, (2003), who observed that weaning of bullseye puffer Sphoeroides annulatus larvae from Artemia during a 5-day period provided time for the larvae to adapt to a new inert diet, resulting in reduced larval mortalities.…”

Section: Discussionmentioning

confidence: 99%

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Effects of weaning on survival and growth of silver therapon ( Leiopotherapon plumbeus ) larvae fed live and artificial diet

Aya

Nillasca

Garcia

2021

Aquaculture Research

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This study examined the effects of early weaning strategies on growth and survival of the silver therapon Leiopotherapon plumbeus larvae. In Trial 1, four larval age groups (8, 14, 20 and 26 days post-hatch (dph)) were abruptly weaned to commercial powdered tilapia diet and compared with wild copepod-fed group as the control. In Trial 2, another batch of three weaning age groups were subjected to gradual weaning (8 dph larvae with 8 days co-feeding, 14 dph larvae with 6 days co-feeding and 20 dph larvae with 4 days co-feeding) with Artemia nauplii prior to weaning on commercial powdered prawn diet and compared with a control group consisted of larvae fed exclusively on Artemia nauplii. Both weaning trials were conducted for 21 days. A gradual weaning strategy promoted better survival (22.2%-40.0%) among weaning age groups than the abrupt weaning strategy (2.2%-36.7%). Except for those weaned at 26 dph, abrupt weaning resulted in significantly poor growth and survival among all weaning age groups compared with the wild copepod-fed control group. The highest survival and growth were observed in 20 dph larvae with 4 days live food co-feeding, although the values were significantly lower than the Artemia-fed control group. These results suggest that abrupt weaning at 26 dph, and gradual weaning for 4 days from 20 dph promote successful rearing of silver therapon larvae and that a microparticulate diet specifically formulated for this species needs to be developed.

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Section: Discussionmentioning

confidence: 99%

“…Silver therapon larvae reared in outdoor tanks prey on diverse natural food items such as copepod nauplii, rotifers, copepods, insect larvae and ostracods during its early feeding stages (Aya et al, 2015(Aya et al, , 2019. Feeding of fish larvae in hatcheries still rely primarily on rotifers Brachionus sp.…”

Section: Introductionmentioning

confidence: 99%

Effects of weaning on survival and growth of silver therapon ( Leiopotherapon plumbeus ) larvae fed live and artificial diet

Aya

Nillasca

Garcia

2021

Aquaculture Research

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“…However, due to the declining state of its wild fishery stock, this fish species has been the subject of several studies in recent years. Studies have been focused on developing techniques for larval production in outdoor tanks (Aya et al., 2015, 2019; Aya & Garcia, 2016), providing solutions to critical bottlenecks impeding the viable growth and survival of silver therapon larvae reared in the hatchery. Rearing of silver therapon larvae at an initial density of 0.4 larvae/L and fed naturally grown food organisms in outdoor tanks has been successful (Aya & Garcia, 2016).…”

Section: Introductionmentioning

confidence: 99%

Optimum stocking density and feeding level for laboratory‐reared early‐stage silver therapon ( Leiopotherapon plumbeus ) larvae

2020

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Growth, survival and feeding of early‐stage silver therapon Leiopotherapon plumbeus larvae reared at different stocking densities and feeding levels were examined. Larvae (8 days post hatch (dph); 0.38–0.50 mg body weight (BW); 5.33–6.90 mm in total length (TL)) were stocked at densities of 5, 15, 25 and 35 larvae/L and co‐fed with live food (Brachionus rotundiformis and Artemia nauplii) and formulated microdiet or fed Artemia alone for 28 days. Another batch of 8 dph silver therapon larvae (0.65 mg BW; 9.47 mm TL) were stocked at 15 larvae/L and were fed 1, 2 or 5 Artemia nauplii/mL for 28 days. Survival at lower densities (5 and 15 larvae/L) was significantly improved than in high‐density reared larvae. Furthermore, larvae fed Artemia alone showed higher survival (20.4%–81.4%) than those offered live food and formulated microdiet combined (3.5%–32.9%) in each stocking density, indicating the suitability of Artemia for early‐stage silver therapon larvae. Growth parameters were significantly affected by stocking density in larvae fed Artemia alone but not in the live food and formulated microdiet co‐fed group. No significant differences in growth and survival were observed in silver therapon larvae reared on three feeding levels. However, higher feed intake at 5 nauplii/mL resulted in significantly higher body lipid contents than those fed 1 or 2 nauplii/mL. The results suggest that larvae held at stocking densities of 5 and 15 larvae/L and fed 5 Artemia nauplii/mL promote maximum growth, survival and higher feed intake of early‐stage silver therapon larvae under laboratory conditions.

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“…There were claims of the increased population of cultured fish in ponds by adding T. catappa leaves. Aya et al (2019) demonstrated that providing T. catappa leaves and allowing them to decompose in culture tanks resulted in 48% of survival rates of Silver therapon (Leiopotherapon plumbeus) larvae, compared to the culture tanks without the T. catappa leaves resulted in only 27% survival rates. The presence of T. catappa leaves would allow the colonisation of insect larvae and zooplankton on the leaf's surface which became food for the L. plumbeus larvae (Aya et al, 2019).…”

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Terminalia catappa Leaves Effects on Aquatic Primary Productivities

PAU¹,

ZAMRI

ZAINI

et al. 2022

BJRST

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Terminalia catappa leaf, also known as Ketapang leaf, is well known for its medicinal properties and long history of use in aquaculture. Studies on the effects of leaf extracts on fish productivity are scarce. This study performed a time-series observation of ground young and mature T. catapppa leaves on tropical phytoplankton productivity. The young and mature leaves were prepared as fine powder separately. For the time-series experiment, 10 grams of each ground leaf were added to 10 L of lake water containing phytoplankton and incubated at room temperature with ambient illumination. The chlorophyll a saturation optical density was quantified on alternate days using a spectrophotometer and the data were analysed using Origin 6.0 Software. On Day 11, the chlorophyll a percentage had decreased by 73% and 81% in the control and mature leave treatment carboys, respectively. Meanwhile, the sample treated with young leaves of T. catappa showed only a 29% decrease. The results have shown that phytoplankton treated with young T. catappa powder demonstrated a positive but weak correlation (R² = 0.123), represented by the chlorophyll saturations. This study supported the hypothesis that young T. catappa leaves sustained phytoplankton growth.

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Improved survival, prey selectivity and diel feeding cycle of silver therapon Leiopotherapon plumbeus (Perciformes: Terapontidae) larvae reared in tanks with substrate

Cited by 8 publications

References 30 publications

Effects of weaning on survival and growth of silver therapon ( Leiopotherapon plumbeus ) larvae fed live and artificial diet

Effects of weaning on survival and growth of silver therapon ( Leiopotherapon plumbeus ) larvae fed live and artificial diet

Optimum stocking density and feeding level for laboratory‐reared early‐stage silver therapon ( Leiopotherapon plumbeus ) larvae

Terminalia catappa Leaves Effects on Aquatic Primary Productivities

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