Is culture performance of juvenile sandfish, Holothuria scabra, in ocean-based nursery systems influenced by proximity to milkfish (Chanos chanos) farms and hapa net mesh size?

Gorospe, Jay R; Juinio‐Meñez, Marie Antonette; Southgate, Paul C.

doi:10.1016/j.aquaculture.2020.735812

Cited by 3 publications

(3 citation statements)

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“…These animals compete with juvenile sandfish for food and living space, negatively affecting growth performance of sandfish juveniles as demonstrated by data reported here for Maliwaliw during the first 30 days of rearing. The periphyton assemblages which provide the primary source of food for sandfish juveniles in the floating hapas typically begin to decline by day 20 (Gorospe et al., 2020, 2020). Thus, regular net change is necessary to ensure that food within the culture system is high and is always available to support growth of sandfish juveniles.…”

Section: Discussionmentioning

confidence: 99%

“…The periphyton assemblages which provide the primary source of food for sandfish juveniles in the floating hapas typically begin to decline by day 20 (Gorospe et al, 2020(Gorospe et al, , 2020. Thus, regular net change is necessary to ensure that food within the culture system is high and is always available to support growth of sandfish juveniles.…”

Section: Implications Of Potential Predators and Competitors On Sandf...mentioning

confidence: 99%

“…Post-settled sandfish juveniles are generally grazers and feed primarily on periphytic assemblages that develop on the inside surfaces of the hapa nets. These periphyton assemblages served as primary food source for sandfish juveniles throughout the 30-60-day ocean nursery culture period (Gorospe et al, 2020(Gorospe et al, , 2021Sinsona & Juinio-Meñez, 2019;Altamirano et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Census of potential predators and competitors of sandfish, Holothuria scabra, juveniles during floating hapa ocean nursery culture

Gorospe

Rescordado²,

Juinio‐Meñez

et al. 2023

Aquaculture Fish & Fisheries

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Predation and competition are among the most important factors affecting sandfish, Holothuria scabra, growth and survival in ocean‐based production systems. In this study, the potential predators and competitors of sandfish juveniles reared at two sites in the Philippines using the floating hapa ocean nursery system were assessed. A total of 26 species of potential predators and competitors from 16 different families of fishes, molluscs and crustaceans were recorded. These taxa were dominated by the opisthobranch Stylocheilus striatus at Bolinao (north–west Luzon) and the isopod Cymodoce sp. at Maliwaliw (eastern Visayas). Highest number of potential predators and competitors that recruited and/or migrated to the inside of floating hapa nets was recorded on day 23 at Bolinao and day 30 at Maliwaliw, then decreased over the 69‐day duration of the study. Mean length, absolute growth rates (AGRs) and survival of sandfish juveniles reared in floating hapas at the two sites varied during the study. AGRs were highest at 1.17 ± 0.06 mm day−1 at Bolinao, and 1 ± 0.08 mm day−1 at Maliwaliw, by days 23 and 60, respectively. Mean lengths of sandfish juveniles reared at Bolinao and Maliwaliw by the end of the study were 46.7 ± 0.15 and 58.8 ± 2.4 mm, respectively, and survival at both sites was high at 96% by the end of the study. Negative correlations were observed between the number of individual predators and competitors, and survival and growth rates of sandfish juveniles reared at Bolinao and Maliwaliw, respectively. Our results highlight the importance of predator and competitor management measures and appropriate site selection to optimize growth performance and survival of sandfish juveniles reared in ocean‐based culture production systems.

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Section: Discussionmentioning

confidence: 99%

Section: Implications Of Potential Predators and Competitors On Sandf...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Census of potential predators and competitors of sandfish, Holothuria scabra, juveniles during floating hapa ocean nursery culture

Gorospe

Rescordado²,

Juinio‐Meñez

et al. 2023

Aquaculture Fish & Fisheries

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Evolving governance structures in community-based sandfish mariculture and their interactions with livelihood outcomes: Evidence from the Philippines

Fabinyi

Gorospe²,

McClean³

et al. 2022

Front. Mar. Sci.

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Sea cucumber mariculture is an important emerging field of practice and applied research in the coastal tropics. This is due to the existing importance of tropical sea cucumber fisheries for wealth generation and poverty reduction, and the potential for mariculture to contribute to the longer term sustainability of these fisheries while generating benefits additional to those from wild caught sea cucumber. Understanding the optimal institutional arrangements for sea cucumber mariculture is an important area of focus in this field, with a variety of arrangements currently in place. This paper documents the establishment of a communal form of sea ranching in the Philippines, as a case study of community level institutional processes. It describes the background to establishment of the sea ranch in the community of Victory, challenges encountered and how these were managed, and the evolution of governance arrangements. In charting this process, we assess the impacts on livelihood outcomes, highlighting this as a crucial aspect influencing this evolution and the nature of community involvement in the sea ranch. While the sea ranching project generated a range of benefits for livelihoods, including possible spillover effects for the surrounding fishery, substantial economic returns from harvests did not occur. Thus, the system of governing the sea ranch evolved from a communal model to a more exclusive household model primarily to improve operational efficiency. In order for possible benefits of the sea ranch to be sustained and enhanced, greater integration with fisheries management and government support will be needed.

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Influence of intra- and interspecific competition on periphyton biomass and growth performance of Holothuria scabra juveniles

Gorospe

Juinio‐Meñez

Southgate

2021

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The effects of sea cucumber (Holothuria scabra) juvenile density and interspecific competition from the opisthobranch Stylocheilus striatus (SS) on periphyton biomass and growth performance of H. scabra (HS) were assessed. The number of H. scabra juveniles (15, 50, 100) in net enclosures (treatments HS15, HS50, and HS100) was varied and feeding activity of S. striatus was assessed at a density of 15 individuals per net enclosure (treatment SS15), and in co-culture with H. scabra (treatment HS15/SS15). A control treatment without H. scabra or S. striatus was included in the 28-d experiment. Highest and lowest growth rates of H. scabra occurred in the lowest (HS15) and highest (HS100) stocking density treatments, respectively, on days 14 and 28. Growth of H. scabra juveniles in the HS15 treatment was more than double that of those in the HS15/SS15 treatment. Juvenile survival was significantly higher in the HS15 treatment on days 14 and 28, but did not differ significantly from that of juveniles in the HS15/SS15 and HS50 treatments on day 14. Grazing activity of sea cucumber juveniles and S. striatus resulted in a decline in periphyton biomass (AFDW) after day 7. Differences in food consumption (based on faecal production) among treatments were significant only on days 1 and 21 with the greatest consumption (17.5 mg periphyton ind−1 d−1) by S. striatus in the SS15 treatment. Holothuria scabra juveniles in the HS15 treatment consumed 4.9 mg ind−1 d−1, while those in the HS100 treatment consumed only 1.8 mg ind−1 d−1 after 24 hrs.

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Is culture performance of juvenile sandfish, Holothuria scabra, in ocean-based nursery systems influenced by proximity to milkfish (Chanos chanos) farms and hapa net mesh size?

Cited by 3 publications

References 37 publications

Census of potential predators and competitors of sandfish, Holothuria scabra, juveniles during floating hapa ocean nursery culture

Census of potential predators and competitors of sandfish, Holothuria scabra, juveniles during floating hapa ocean nursery culture

Evolving governance structures in community-based sandfish mariculture and their interactions with livelihood outcomes: Evidence from the Philippines

Influence of intra- and interspecific competition on periphyton biomass and growth performance of Holothuria scabra juveniles

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