scholarly journals Survival and growth of the Caribbean scallops, Argopecten nucleus and Nodipecten nodosus, in suspended systems at different culture depths and net replacement frequencies

2019 ◽  
Vol 11 ◽  
pp. 537-549 ◽  
Author(s):  
LA Velasco ◽  
J Barros
Keyword(s):  
Survival And Growth ◽  
The Caribbean ◽  
Net Replacement ◽  
Nodipecten Nodosus

scholarly journals REMOTE SETTING OF Nodipecten nodosus (Linnaeus 1758) LARVAE

2020 ◽  
Vol 46 (3) ◽  
pp. 1-8
Author(s):  
Robson Cardoso COSTA ◽  
◽  
Gilberto Caetano MANZONI ◽  
Francisco Carlos da SILVA ◽  
Carlos Henrique Araújo de Miranda GOMES ◽  
...  
Keyword(s):  
Statistical Difference ◽  
Larval Survival ◽  
Control Treatment ◽  
Settlement System ◽  
Growth And Survival ◽  
Controlled Conditions ◽  
Place Of Origin ◽  
Survival And Growth ◽  
Remote Setting ◽  
Nodipecten Nodosus

The present study aimed to evaluate the growth and survival of Nodipecten nodosus larvae grown in a remote settlement system. Two forms of transport were tested, one in a humid/wet, environment and one submerged in seawater, with a control treatment maintained at the Laboratory of Marine Mollusks (LMM). After transport treatments, individuals were populated simultaneously inside floating boxes directly at sea and in containers under controlled conditions in the Laboratory of the Experimental Center for Mariculture (CEMAR). No statistical differences were observed in larval survival relative to the method of transport in the different experiments. However, statistical differences were observed in evaluation 1 (EVA1) for the survival and growth of larvae transported in submerged seawater and settled in the laboratory. No statistical difference was observed between the control and either wet/humid or submerged treatments in EVA2. The survival values in the control treatment in EVA3 were higher (p<0.05) in relation to the wet and submerged treatments cultivated in the laboratory. It was not possible to observe the presence of pre-seeds in treatments grown at sea. Is possible to transport larvae for 6 hours of travel to be settled in controlled conditions far from their place of origin.

scholarly journals Isolation, culture and evaluation of Chaetoceros muelleri from the Caribbean as food for the native scallops, Argopecten nucleus and Nodipecten nodosus

2017 ◽  
Vol 44 (3) ◽  
pp. 557-568
Author(s):  
Luz Adriana Velasco ◽  
Silvia Carrera ◽  
Judith Barros
Keyword(s):  
Culture Media ◽  
Organic Fertilizer ◽  
Ammonia Excretion ◽  
Local Strain ◽  
Organic Content ◽  
Chaetoceros Muelleri ◽  
Scope For Growth ◽  
Physiological Variables ◽  
The Caribbean ◽  
Nodipecten Nodosus

The potential of the Caribbean strain Chaetoceros muelleri (CHA-C-04) to be produced and used as diet of two commercially important native scallops (Argopecten nucleus and Nodipecten nodosus) was assessed, using the non-indigenous Chaetoceros calcitrans strain, as a control. Growth and biomass of both diatoms were compared under different culture environments (indoor and outdoor) and culture media (F/2, organic fertilizer triple 15 and humus extract). In addition, their bromatological composition and effect on the physiological condition of the scallops fed with both diatoms were compared. The growth and biomass production of C. muelleri and C. calcitrans were higher under indoor conditions and using the F/2 media. Although the content of proteins, lipids and energy was higher in C. muelleri than in C. calcitrans, its size, organic content, growth and biomass values were not different. Scallops fed with both diatoms strains shows similar values for all of the physiological variables measured, including rates of absorption, oxygen consumption, ammonia excretion and scope for growth. Results suggest that the local strain C. muelleri can be successfully produced and used in the diet of A. nucleus and N. nodosus, but do not offer productive advantages.

scholarly journals Early Life-History Dynamics of Caribbean Octocorals: The Critical Role of Larval Supply and Partial Mortality

2021 ◽  
Vol 8 ◽  
Author(s):  
Ángela Martínez-Quintana ◽  
Howard R. Lasker
Keyword(s):  
Life History ◽  
Early Life ◽  
Critical Role ◽  
Early Life History ◽  
Larval Supply ◽  
Partial Mortality ◽  
Potential Growth ◽  
Survival And Growth ◽  
The Caribbean

Recruitment is a key demographic process for maintenance of local populations and recovery following disturbance. For marine invertebrates, distribution and abundances of recruits are impacted by spatiotemporal variation in larval supply, settlement rates and post-settlement survival. However, for colonial and modular organisms, differences in survival and growth between settlers and colonial recruits may also affect recruitment patterns. In the Caribbean, shifts in the benthic community structure favoring octocoral’s have been detected, and recruitment has been suggested as key for octocoral’s resilience. Hence, we studied octocoral recruitment dynamics, and evaluated the role of pre-settlement, settlement and post-settlement processes in recruit’s densities. We performed the study at two sites with different octocoral densities, on the south coast of St. John, United States Virgin Islands, and distinguished between processes occurring to recently settled polyps and to colonial recruits. At both sites, we monitored P. homomalla settlers on settlement tiles for 3 months, and colonial recruits of two of the most abundant genera (Eunicea and Pseudoplexaura) for 3 years. In addition, we assessed whether recruits morphological traits affected recruitment and divided recruits of the genus Eunicea based on the presence of large calyces. The major contributor to both, single-polyps and colonial recruit densities was larval supply. Single-polyp densities were not limited by the availability of space, settlement cues, or early post-settlement survival. Height was the only predictor of survival and growth of colonial recruits, with potential growth rates increasing with height. However, large recruits suffered partial mortality often, distorting the relationship between recruit age and size, and causing most recruits to remain in the recruit size class (≤5 cm) longer than a year. Octocorals have been resilient to the conditions that have driven the decline of scleractinian corals throughout the Caribbean, and recruitment has been key to that success. Our results are crucial to understand early life history dynamics of Caribbean octocorals, and highlights the need to standardize the definition of recruit among colonial and modular taxa to facilitate inter-specific comparisons, and to understand future changes in coral reef community assemblages.

scholarly journals The Effects of Depth-Related Environmental Factors on Traits in Acropora cervicornis Raised in Nurseries

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 212
Author(s):  
Claudia Patricia Ruiz-Diaz ◽  
Carlos Toledo-Hernández ◽  
Juan Luis Sánchez-González ◽  
Brenda Betancourt
Keyword(s):  
Global Climate Change ◽  
Global Climate ◽  
Seawater Temperature ◽  
The Other ◽  
Acropora Cervicornis ◽  
Light Levels ◽  
Survival And Growth ◽  
The Caribbean ◽  
Slight Advantage

Populations of Acropora cervicornis, one of the most important reef-building corals in the Caribbean, have been declining due to human activities and global climate change. This has prompted the development of strategies such as coral farms, aimed at improving the long-term viability of this coral across its geographical range. This study focuses on comprehending how seawater temperature (ST), and light levels (LL) affect the survival and growth of A. cervicornis fragments collected from three reefs in Culebra, Puerto Rico. These individuals were fragmented into three pieces of the similar sizes and placed in farms at 5, 8, and 12 m depth. The fragments, ST and LL were monitored for 11 months. Results show that fragments from shallow farms exhibit significantly higher mortalities when compared to the other two depths. Yet, growth at shallow farms was nearly 24% higher than at the other two depths. Corals grew fastest during winter, when temperature and LL were lowest, regardless of the water depth. Fragment mortality and growth origin were also influenced by reef origin. We conclude that under the current conditions, shallow farms may offer a slight advantage over deep ones provided the higher growth rate at shallow farms and the high fragment survival at all depths.

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