Gallardo Ojeda, Pablo Rodrigo

Nombre preferido

Nombre completo

Gallardo Ojeda, Pablo Rodrigo

Afiliación principal

Departamento de Ciencias Agropecuarias y Acuícolas

pablo.gallardo@umag.cl

ORCID

0000-0002-8368-9055

Jerarquía académica

Prof. Titular

Línea de investigación

Ciencia Antartica y Subantartica

Buscar

Publicaciones

Mostrando 1 - 6 de 6

Some of the metrics are blocked by your
consent settings
DOI 10.1016/j.heliyon.2023.e16336
Economic and financial risks of commercial tilapia cage culture in a neotropical reservoir
2023-06
Brande, Maicon da Rocha
;
Santos, David Ferreira Lopes
;
Fialho, Naor Silveira
;
Proenca, Danilo Cintra
;
Gallardo Ojeda, Pablo Rodrigo
;
Godoi, Flavia C. M.
;
Roubach, Rodrigo
;
Bueno, Guilherme Wolff
The aim of this study was to analyze the financial and economic risks of tilapia cage culture across different production water volumes (m3). The production water volumes evaluated were 10 to 50 thousand m3 (Small Volume, SV), 51 to 150 thousand m3 (Medium Volume, MV), 151 to 300 thousand m3 (Large Volume, LV), and >301 thousand m3 (Extra-Large Volume, ELV). Produc-tivity and economic data were obtained from a commercial Nile tilapia cage farm with 232 net cages installed in a neotropical reservoir, in Brazil, from 2017 to 2019. Cost and profitability analyses, economic feasibility, and risk and sensitivity analyses were performed using a Monte Carlo simulation. The implementation of commercial tilapia cage farming relies mainly on feed prices. The initial investment demand is proportional to the size of the farms. On the other hand, MV, LV, and ELV tilapia farms showed the lowest financial risks despite the higher investments. These farms presented a medium-low risk at&AP;39% probability, whereas the SV farm presented a medium to medium-high risk at 51.17% probability. Thus, fish farms with a production volume above 51 thousand m3 tend to be more profitable and have a&AP;36% probability of low financial and economic risk with a Payback period of fewer than 10 years, mainly due to the lower feed costs per mass of fish produced. This study assists investors in choosing a better path toward a more viable and profitable activity.
Some of the metrics are blocked by your
consent settings
DOI 10.1016/j.heliyon.2023.e16336
Economic and financial risks of commercial tilapia cage culture in a neotropical reservoir
2023-06
Brande, Maicon da Rocha
;
Santos, David Ferreira Lopes
;
Fialho, Naor Silveira
;
Proenca, Danilo Cintra
;
Gallardo Ojeda, Pablo Rodrigo
;
Godoi, Flavia C. M.
;
Roubach, Rodrigo
;
Bueno, Guilherme Wolff
The aim of this study was to analyze the financial and economic risks of tilapia cage culture across different production water volumes (m3). The production water volumes evaluated were 10 to 50 thousand m3 (Small Volume, SV), 51 to 150 thousand m3 (Medium Volume, MV), 151 to 300 thousand m3 (Large Volume, LV), and >301 thousand m3 (Extra-Large Volume, ELV). Produc-tivity and economic data were obtained from a commercial Nile tilapia cage farm with 232 net cages installed in a neotropical reservoir, in Brazil, from 2017 to 2019. Cost and profitability analyses, economic feasibility, and risk and sensitivity analyses were performed using a Monte Carlo simulation. The implementation of commercial tilapia cage farming relies mainly on feed prices. The initial investment demand is proportional to the size of the farms. On the other hand, MV, LV, and ELV tilapia farms showed the lowest financial risks despite the higher investments. These farms presented a medium-low risk at&AP;39% probability, whereas the SV farm presented a medium to medium-high risk at 51.17% probability. Thus, fish farms with a production volume above 51 thousand m3 tend to be more profitable and have a&AP;36% probability of low financial and economic risk with a Payback period of fewer than 10 years, mainly due to the lower feed costs per mass of fish produced. This study assists investors in choosing a better path toward a more viable and profitable activity.
Scopus© Citations 7 2
Some of the metrics are blocked by your
consent settings
DOI 10.1016/j.scitotenv.2020.142448
Evaluating the effects of ocean warming and freshening on the physiological energetics and transcriptomic response of the Antarctic limpet Nacella concinna
2020-12-15
Navarro, Jorge M.
;
Detree, Camille
;
Morley, Simon A.
;
Cardenas, Leyla
;
Ortiz, Alejandro
;
Vargas-Chacoff, Luis
;
Paschke, Kurt
;
Gallardo Ojeda, Pablo Rodrigo
;
Guillemin, Marie-Laure
;
Gonzalez-Wevar, Claudio
In the Southern Ocean, warming and freshening are expected to be prominent signals of climate change and the reduced ability of Antarctic marine organisms to cope with changing environmental conditions could challenge their future survival. The Antarctic limpet Nacella concinna is amacroinvertebrate of rocky ecosystems, which occurs in high densities in the shallow subtidal zone. Subtidal individuals were exposed to a combination of temperatures (1, 4, 8, 11, 14 degrees C) and salinities ( 20 and 30 psu) for a 60-day period. A drastic increment in mortality was observed with seawater warming, showing that N. concinna is highly stenothermal, with limited ability to survive at temperatures warmer than 4 degrees C, although there was some degree of acclimation at 4 degrees C and ambient salinity (30 psu). This study confirmed the stenohaline characteristic of this species, with mortality reaching 50% and lower scope for growth at low salinity (20 psu) even at the control temperature (1 degrees C). At the sub-cellular level, limpets' lowtolerance to out-of range salinity is illustrated by the activation of cell remodelling processes whereas the down-regulation of chaperones proteins and plasma membrane ATPase suggest that under the combination of warming and freshening N. concinna experiences a severe level of stress and devote much of its energy to somatic maintenance and survival. The drastic effect observed can be explained by its subtidal origin, an environmentwith more stable conditions. The surviving individuals at 1 degrees C and lowered salinity (20 psu) were either more tolerant or showing signs of acclimation after 60 days, but the combination of warming and freshening have a greater combined stress. Projections of climate change for end of the century for this part of the Antarctic can, therefore, result in a significant diminution of the subtidal population of N. concinna, affecting ecological interactions and diversity of the food web. (c) 2020 Elsevier B.V. All rights reserved.
Scopus© Citations 18 1
Some of the metrics are blocked by your
consent settings
DOI 10.4067/s0719-56052019000100257
Voces que construyen memoria colectiva. La dimensión inmaterial del patrimonio industrial en la Población Obrera Sociedad Explotadora de Tierra del Fuego, Punta Arenas, Chile
2019-06-01
Rodrigo Ojeda
;
Ambrosetti Garrido, Daniela Loredanna
;
Cvitanic Diaz, Boris Alejandro
La construcciÃ³n de la PoblaciÃ³n Obrera Sociedad Explotadora de Tierra del Fuego, en la dÃ©cada de 1950 en la ciudad de Punta Arenas, significÃ³, ademÃ¡s de una manifestaciÃ³n de las lÃ³gicas del paternalismo industrial en la zona, la consolidaciÃ³n de una comunidad de vecinos que afianzÃ³ un fuerte lazo entre sÃ. Una vez que la industria ganadera se desprendiÃ³ de las viviendas, en la antesala de su desapariciÃ³n, aquella comunidad comenzÃ³ a disgregarse. El siguiente artÃculo explora en torno a la memoria colectiva que ha sobrevivido a aquel proceso de disociaciÃ³n, en tanto forma que busca evitar su desapariciÃ³n y reivindicar un legado en el que se funden elementos arquitectÃ³nicos con dimensiones socioculturales.
Some of the metrics are blocked by your
consent settings
DOI 10.4067/s0719-56052019000100257
Voces que construyen memoria colectiva. La dimensión inmaterial del patrimonio industrial en la Población Obrera Sociedad Explotadora de Tierra del Fuego, Punta Arenas, Chile
2019-06-01
Rodrigo Ojeda
;
Ambrosetti Garrido, Daniela Loredanna
;
Cvitanic Diaz, Boris Alejandro
La construcciÃ³n de la PoblaciÃ³n Obrera Sociedad Explotadora de Tierra del Fuego, en la dÃ©cada de 1950 en la ciudad de Punta Arenas, significÃ³, ademÃ¡s de una manifestaciÃ³n de las lÃ³gicas del paternalismo industrial en la zona, la consolidaciÃ³n de una comunidad de vecinos que afianzÃ³ un fuerte lazo entre sÃ. Una vez que la industria ganadera se desprendiÃ³ de las viviendas, en la antesala de su desapariciÃ³n, aquella comunidad comenzÃ³ a disgregarse. El siguiente artÃculo explora en torno a la memoria colectiva que ha sobrevivido a aquel proceso de disociaciÃ³n, en tanto forma que busca evitar su desapariciÃ³n y reivindicar un legado en el que se funden elementos arquitectÃ³nicos con dimensiones socioculturales.
2
Some of the metrics are blocked by your
consent settings
DOI 10.1016/j.aqrep.2021.100958
Status of Atlantic halibut (Hippoglossus hippoglossus) aquaculture production technology in Chile
2022-2
Gallardo Ojeda, Pablo Rodrigo
;
Bueno, Guilherme Wolff
;
Araneda, Cristian
;
Benfey, Tillmann
The European aquaculture industry began to undertake Atlantic halibut (Hippoglossus hippoglossus) aquaculture in the 1980s due to the favorable growth rate and high market value of this cold-water marine fish. Atlantic halibut cultivation began in Chile in 1996 in the Magallanes region (53S). Chilean aquaculture facilities were finally equipped to begin rearing Atlantic halibut after 12 years and a total investment of $ 2 million USD. Infrastructure is now in place to manage the entire production cycle, including broodstock rearing, egg incubation, larval rearing (yolk-sac stage, first-feeding), weaning, the nursery stage, on-growing in land-based tanks, harvest, and marketing. The hatchery phase to produce 10-g juveniles requires 10-12 months, followed by an approximately 30-month grow-out phase in land-based tanks to produce 3-kg fish. Further research and development are being performed in nutrition (diet formulation), genetics (selection for disease resistance and growth rate), fish health, and environmental issues to support the development of a sustainable marine aquaculture industry for this species.
Scopus© Citations 6 1

Gallardo Ojeda, Pablo Rodrigo

Buscar

Ajustes

Filtrar por:

Ajustes

Publicaciones