Article
Fisheries
Natalie Freret-Meurer, Tatiane C. Fernandez, Amanda C. Vaccani
Summary: One of the consequences of climate change is the increase in ocean temperature, which has a significant impact on biodiversity. This study investigates the variation in the population structure of H. reidi in the northern Guaiba Island area between 2015 and 2017, and suggests a potential relationship between this variation and the thermal anomaly associated with the El Nino phenomenon. The results show a positive correlation between seahorse density and water temperature, while the sex ratio and number of juveniles were not affected. The diversity of holdfasts used by seahorses increased over the study period and was inversely proportional to the thermal anomaly.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Fisheries
Jorgelia de Jesus Pinto Castro, Cristina Vaz Avelar de Carvalho, Gabriel Passini, Bethania Dal Col Lehrback, Cesar Alexandro da Silva, Renato Rodrigues Neto, Maik dos Santos Cividanes da Hora, Monica Yumi Tsuzuki
Summary: This study investigated the effects of feeding frequency on Hippocampus reidi broodstock, focusing on oocyte fatty acid profile, reproduction, and larval resistance to starvation. The results showed that feeding the broodstock three to four times per day promoted egg production and resulted in higher quality larvae, while feeding once a day had negative effects on weight gain and growth rates.
AQUACULTURE INTERNATIONAL
(2023)
Article
Fisheries
Miquel Planas
Summary: This study assessed the influence of pre-breeding diet on seahorse reproduction for the first time, showing that feeding a mixed diet (Artemia and mysidaceans) throughout the pre-breeding period can enhance breeding performance and newborn size and quality. Isotopic analysis revealed a stable state in newborn batches after the second month of the breeding period, highlighting the importance of pre-breeding diet on seahorse reproduction.
Article
Zoology
Paula Suarez-Bregua, Sofia Rosendo, Pilar Comesana, Lucia Sanchez-Ruiloba, Paloma Moran, Miquel Planas, Josep Rotllant
Summary: The DNA methylation profile of H. reidi differs significantly during postnatal development and settlement on demersal habitats. Gene expression analysis revealed up- and down-regulation of specific DNA methyltransferases (DNMTs) encoding genes. Epigenetic mechanisms may be necessary for seahorse settlement, but further investigation is needed to determine if these mechanisms are internally or externally initiated.
FRONTIERS IN ZOOLOGY
(2021)
Article
Agriculture, Dairy & Animal Science
Jorge Hernandez-Urcera, Mario Davi Dias Carneiro, Miquel Planas
Summary: The present study aims to investigate the effect of two feeding schedules on the early development and physiology of seahorse Hippocampus reidi juveniles. The results indicate that extending the feeding period on copepods improves the welfare and condition of juveniles. However, switching from copepods to Artemia nauplii at earlier developmental stages leads to lower growth rates and survival.
Article
Environmental Sciences
Miquel Planas, Ike Olivotto, Maria Jesus Gonzalez, Rosaria Laura, Carlo Angeletti, Adolfo Amici, Matteo Zarantoniello
Summary: The study evaluated the effects of two pre-breeding diets on newborn quality and viability in seahorses, showing that a high-quality diet can enhance reproductive success.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Ecology
Natalie Villar Freret-Meurer, Tatiane do Carmo Fernandez, Amanda do Carmo Vaccani
Summary: The study investigated the presence of seahorses in Araruama hypersaline lagoon using rapid assessment surveys and citizen science data. Transects were conducted at six study sites, and population parameters were recorded. Citizen scientists also provided valuable occurrence records through social media. Findings revealed a female-biased population of Hippocampus reidi in the lagoon, with high densities and attachment to artificial holdfasts. The study highlights the importance of citizen scientists in expanding ecological knowledge and provides insights into seahorses' adaptability to extreme conditions.
Article
Fisheries
Jorge Palma, Ricardo Lima, Jose Pedro Andrade, Maria Joao Lanca
Summary: This study aimed to determine a nutritionally adequate feeding protocol for Hippocampus hippocampus juveniles. The results suggest that feeding copepods during the first 7 days post-parturition promotes maturation of the digestive tract of juvenile seahorses, and the addition of a limited amount of copepods to the diet improves H. hippocampus juvenile growth performance.
Article
Biochemistry & Molecular Biology
M. D. Dias Carneiro, S. Garcia-Mesa, L. A. Sampaio, M. Planas
Summary: The study focused on the vulnerability of juvenile Seahorse Hippocampus reidi to acidic exposure in different salinity levels, with findings indicating higher cortisol levels in acidic conditions in brackish water and biochemical alterations at enzymatic level in seawater. Overall survival rates were above 90% and did not significantly differ among pH levels.
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
(2021)
Article
Agriculture, Dairy & Animal Science
Mario D. D. Carneiro, Sergio Garcia-Mesa, Luis A. Sampaio, Miquel Planas
Summary: This study investigated the effects of acidification and different salinity conditions on the growth and fitness of seahorse. The results showed that seahorse juveniles reared in seawater under acidic conditions had better overall performance and fitness compared to those reared in brackish water.
Article
Fisheries
Xin Liu, Xueling Li, Dong Zhang, Tingting Lin, Siping Li
Summary: A two-factorial experiment was conducted to evaluate the effects of different temperatures and diets on the biochemistry of juvenile lined seahorses. The results showed that temperature, diet, and their interaction significantly affected all components. The highest content of amino acids and fatty acids was found in juveniles fed with frozen Neomysis awatschensis (FNA) at 23 degrees C.
JOURNAL OF THE WORLD AQUACULTURE SOCIETY
(2023)
Article
Biodiversity Conservation
Roberto Schwarz Jr, Ana Cristina Novelino Penna Franco, Adauto de Souza Ribeiro, Marcel Andrade Martins, Marcelo Soeth, Olimpio Rafael Cardoso, Henry Louis Spach
Summary: The population structure of the longsnout seahorse Hippocampus reidi was evaluated in an estuarine system in northeastern Brazil. The study showed that the seahorses exhibit steeper growth during the first months of life, with growth stabilization after reaching a certain size and age. The seahorses were found to use mangrove roots as the main substrate for attachment and display well-defined ecological characteristics including habitat fidelity and highly structured social organization.
Article
Marine & Freshwater Biology
Tatiane Fernandez do Carmo, Luciano Neves dos Santos, Athila Andrade Bertoncini, Natalie Villar Freret-Meurer
Summary: This study evaluated and compared the seasonal variations of Hippocampus reidi population structures in two Brazilian coastal areas, and found similarities in population structures and seasonality between the two areas.
OCEAN AND COASTAL RESEARCH
(2022)
Article
Environmental Sciences
Karl F. W. Foley, Daniel Barnett, Deborah A. Cory-Slechta, Houhui Xia
Summary: Arsenic is a well-established carcinogen that can increase mortality, but its effects on the central nervous system, especially in early development, are not well understood. Research shows that exposure to arsenic early in life is associated with learning deficits and behavioral changes, affecting synaptic transmission and plasticity in the hippocampus.
Article
Biochemistry & Molecular Biology
Julia Heise, Thomas Schmitz, Christoph Buehrer, Stefanie Endesfelder
Summary: High-risk preterm infants are at risk of cognitive developmental deficits due to oxygen toxicity. Caffeine has a neuroprotective effect and can counteract the negative effects of oxygen insult on neuronal maturation in the hippocampus. Interestingly, caffeine inhibits the transcription of neuronal mediators in normoxia.