Jorge Palma

Jorge Palma
Centro de Ciências do Mar | CCMAR

PhD

About

47
Publications
9,163
Reads
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828
Citations
Citations since 2016
18 Research Items
452 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
Seahorse research. Evaluation of anthropogenic impacts using seahorses as flagship species to prevent the loss of biodiversity. Captive breeding seahorse program focused on nutrition and husbandry requirements as a tool for seahorse conservation.
Additional affiliations
January 2003 - March 2013
Universidade do Algarve
Position
  • Researcher

Publications

Publications (47)
Article
Full-text available
The global market of dried seahorses mainly supplies Traditional Chinese Medicine and still relies on blurry trade chains that often cover less sustainable practices targeting these pricey and endangered fish. As such, reliable tools that allow the enforcement of traceability, namely to confirm the geographic origin of traded seahorses, are urgentl...
Article
Full-text available
Genetic diversity is the raw foundation for evolutionary potential. When genetic diversity is significantly reduced, the risk of extinction is heightened considerably. The long-snouted seahorse ( Hippocampus guttulatus ) is one of two seahorse species occurring in the North-East Atlantic. The population living in the Ria Formosa (South Portugal) de...
Article
An 8-week growth trial was conducted to examine the efficacy of pineapple peel powder (PAPP) on growth rate and immunity of Nile tilapia, O. niloticus. Three hundred Nile tilapia (20.91 ± 0.11 g) were fed five diets containing different levels of PAPP at 0, 10, 20, 30 and 40 g kg-1 PAPP, respectively. After four and eight weeks of the feeding trial...
Article
Full-text available
Photo-identification has been proven to be a successful individual recognition tool in seahorse species (e.g., long-snout seahorse Hippocampus reidi (Ginsburg, 1933) and long-snouted seahorse Hippocam-pus guttulatus (Cuvier, 1829)). Its use was deemed valuable for the assessment of wild populations and to understand variations in abundance over tim...
Article
A feeding trial was conducted to assess the effect of dietary supplementation of sericite (silicate clay) on growth performance, digestive enzymes activity, immune parameters and gut microbiota, of Nile tilapia, Oreochromis niloticus (L.) fingerlings. Five isonitrogenous diets were formulated each diet supplemented with different levels of sericite...
Article
• This study evaluated the effects of underwater noise as a source of acoustic stress in the wild populations of Hippocampus guttulatus in the Ria Formosa, south Portugal. Two different scenarios of underwater noise were tested: transient motor boat sound (63.4–127.6 dB) and constant sound produced by the motor of the boat directly above the animal...
Article
Full-text available
Human activities such as trade and transport have increased considerably in the last decades, greatly facilitating the introduction and spread of non-native species at a global level. In the Iberian Peninsula, Fundulus heteroclitus , a small euryhaline coastal fish with short dispersal, was found for the first time in the mid-1970s. Since then, F....
Preprint
Full-text available
Human activities such as trade and transport have increased considerably in the last decades, greatly facilitating the introduction and spread of non-native species at a global level. In the Iberian Peninsula, Fundulus heteroclitus , a small euryhaline coastal fish with short dispersal, was found for the first time in the mid-1970s. Since then, F....
Preprint
Human activities such as trade and transport have increased considerably in the last decades, greatly facilitating the introduction and spread of non-native species at a global level. In the Iberian Peninsula, Fundulus heteroclitus , a small euryhaline coastal fish with short dispersal, was found for the first time in the mid-1970s. Since then, F....
Article
Full-text available
Recent findings reported a significant decrease in abundance of two seahorse species (Hippocampus guttulatus and H. hippocampus) in the Ria Formosa lagoon (South Portugal) and no direct causes have been, so far, clearly identified. This study aimed to describe fluctuations in the local seahorse populations through monthly surveys over a course of a...
Article
This work tested the effect of using different live and frozen feed on the growth performance of Syngnathus typhle. It was divided into two experiments. In Experiment I Artemia and Atlantic ditch shrimp (Palaemonetes varians) larvae were used as live diets, whilst in Experiment II frozen mysids Mesopodopsis slabberi and frozen P. varians were used....
Conference Paper
Full-text available
The deployment of Artificial Holdfast Units (AHU) has been demonstrated as an effective tool for creating holdfast and sheltering conditions for Hippocampus guttulatusin the Ria Formosa (South Portugal). Preliminary results obtained with a pilot-scale AHU showed a high settlement rate, with recorded densities of up to 13.1 individuals.m-2. With the...
Preprint
Full-text available
The deployment of Artificial Holdfast Units (AHU) has been demonstrated as an effective tool for creating holdfast and sheltering conditions for Hippocampus guttulatus in the Ria Formosa (South Portugal). Preliminary results obtained with a pilot-scale AHU showed a high settlement rate, with recorded densities of up to 13.1 individuals.m ⁻² . With...
Presentation
Full-text available
Identifying sources of marine population variability is a central goal in marine ecology and conservation, which requires long-term, repeated monitoring to assess whether there is cause for concern, particularly for species with vulnerable life history traits. Between 2001 and 2009 there were substantial declines in populations of two seahorse spec...
Poster
Full-text available
The deployment of Artificial Holdfast Units (AHU) has been demonstrated as an effective tool for creating holdfast and sheltering conditions for Hippocampus guttulatus in the Ria Formosa (South Portugal). Preliminary results obtained with a pilot-scale AHU showed a high settlement rate, with recorded densities of up to 13.1 individuals.m-2. With th...
Presentation
Full-text available
A significant decline in the seahorse populations in the Ria Formosa (south Portugal) was recently reported and holdfast availability suggested as a particularly important variable that influences the abundance of the long-snouted seahorse Hippocampus guttulatus and the short-snouted seahorse H. hippocampus. In order to test the usefulness of artif...
Article
This study investigated the effect of dietary astaxanthin supplementation on egg quality and juvenile growth of long snout seahorse (Hippocampus guttulatus). Captive breed seahorse broodstock were fed four diets composed of frozen shrimp [Atlantic ditch shrimp, Palaemonetes varians) used as a vector to deliver artificial diets with increasing level...
Article
Comparisons of three sets of surveys in the Ria Formosa Lagoon, Portugal, over a 13 year period (2001-2002, 2008-2009 and 2010-2013) revealed significant population fluctuations in at least one of the two seahorse (Hippocampinae) species living there, and that those fluctuations were potentially associated with habitat changes in the lagoon. After...
Poster
Full-text available
Identifying sources of marine population variability is a central goal in marine ecology and conservation, which requires long-term, repeated monitoring to assess whether there is cause for concern, particularly for species with vulnerable life history traits. Between 2001 and 2009 there were substantial declines in populations of two seahorse spec...
Poster
Full-text available
Two different Underwater Visual Census (UVC1 and UVC2) were performed at three sites in the Ria Formosa, using 30 meter transect belts, and compared for differences in seahorse density and holdfast availability. Each UVC differed in transect placement and total survey area coverage. The observed Hippocampus guttulatus density was significantly high...
Article
A significant decline in the seahorse populations in the Ria Formosa has been recently reported and holdfast availability suggested as a particularly important variable that influences the abundance of the long-snouted seahorse (Hippocampus guttulatus) and the short-snouted seahorse (H. hippocampus). In order to test the usefulness of artificial ho...
Article
Full-text available
In this study, the spot pattern in Hippocampus guttulatus was analysed using a computer programme algorithm that allowed individual comparison. This methodology was first tested in a controlled environment using 51 adult and 55 juvenile H. guttulatus. Positive matches were obtained in 86·3 and 83·6% of the adults and juveniles, respectively. In a s...
Article
This study was carried out to estimate lysine, methionine and arginine dietary requirements of juvenile Atlantic ditch shrimp, Palaemonetes varians. Three series of five isoproteic and isoenergetic diets [45% crude protein (CP), 14.7 MJ digestible energy (DE)/kg] were formulated to contain increasing levels of either lysine (1.2–2.8 g/100 g of diet...
Article
Full-text available
Ontogenetic development of the digestive tract and associated organs in long snout seahorse Hippocampus guttulatus juveniles was morphologically and histologically examined from the time of release from the male's pouch until 72 h after the first meal. When released from the male's pouch, juvenile seahorses are small adult replicates. This means th...
Article
Full-text available
The aim of this study was to determine suitable Artemia enrichment and feeding protocols for the rearing of juvenile long snout seahorse, Hippocampus guttulatus from birth. The first phase of the project, examined the effect of two different Artemia enrichments treatments (DHA-Selco®, and Chlorella sp.) on the growth performance and survival of ear...
Article
Artificial marking and tagging techniques have been used to study movement, population dynamics, behaviour, ecology, survival and growth of at least 25 syngnathid species. External necklace-style tags and injection of visible implant elastomer have been the most used techniques, uniquely identifying hundreds of individual syngnathids to study popul...
Article
Full-text available
This investigation examined the effects of temperature, density and early weaning on the survival and growth of Palaemonetes varians larvae. Survival of larvae raised at 17.5 °C was not significantly different (average + standard deviation) (94 ± 5%) from the survival of those raised at 19.5 °C (95 ± 5%) and at 21.5 °C (94 ± 4%). However, the durat...
Article
Full-text available
Variações Inter-anuais E Entre Colónias Na Dieta E Ecologia Alimentar De Adultos E Filhotes De Chilreta Em Portugal Neste trabalho foi estudada a dieta e ecologia alimentar de adultos e filhotes de Sterna albifrons no norte e no sul de Portugal, entre 2000 e 2004, a partir de egagrópilas e presas caídas perto dos ninhos. Foram comparadas as dietas...
Article
Full-text available
This investigation compared the effects of using two binders of no nutritional value, lignosol and agar, and the binding method, microbinding and microcoating, on the growth of juvenile Atlantic ditch shrimp, Palaemonetes varians, and rockpool prawn, Palaemon elegans. Shrimp were fed one basal diet which varied solely in binder type and method of i...
Article
Full-text available
This investigation examined the effect of using three different natural frozen diets; shrimp (Palaemonetes varians), mysids (Mesopodopsis slabberi) and adult Artemia on the fitness condition of adult long snout seahorse (Hippocampus guttulatus). At the end of the 12 week experimentation, significant differences on the final wet weight were found be...
Article
Full-text available
Spider crab (Maja squinado) is a species of high commercial interest. It inhabits the Northeast Atlantic (Kergariou 1984; Le Foll 1993) and Mediterranean Sea and its market is based solely on captures from the wild. Its production in captivity would be a step towards the diversification of aquaculture products and the protection of natural stocks....
Article
Full-text available
This investigation examined the effect of prey condition on the growth and survival of juvenile cuttlefish (Sepia officinalis). In the first group, cuttlefish were fed with daily captured live Palaeomonetes varians from the wild [daily prey (DP)], the second group was fed 5 days stocked and starved P. varians [starved prey (SP)], while in the third...
Article
Full-text available
Abstract This investigation examined the effects of live prey availability on growth and survival of Sepia officinalis. Two independent experiments, comprising two feed rations each, were performed, using adequate prey size. In the first experiment, cuttlefish hatchlings were fed live mysids, Paramysis nouvelli [(feed ratio I (fr I)], at 15% body w...
Article
Full-text available
We used pellets and prey dropped near nests to study the diet and feeding ecology of Little Tern (Sterna albifrons) adults and chicks in northern and southern Portugal during 2000–2004. We compared diets among study areas, years, and birds breeding in two main habitat types: sandy beaches and salinas (man-made salt-pans). We also sampled prey fish...
Article
Full-text available
Aims To describe diet and growth of Little Tern chicks, to examine the influence of tide and wind speed on food delivered to chicks in southern Portugal, and to determine whether diet and early chick growth parameters differed between birds breeding in natural (sandy beaches) and man-made alternative (salinas) habitats. Methods Nests were marked an...
Article
Full-text available
in food supply has a marked impact on breeding parameters and productivity of small seabirds such as terns (Monaghan et al. 1989), because they possess little spare capacity in their energy budgets and spend a larger proportion of their time foraging compared to other seabird species (Pearson 1968). Variation in food supply has been shown to influe...
Article
Sparids are a group of demersal perciform fish of high commercial value, which have experienced an extensive radiation, particularly in the Mediterranean, where they occupy a variety of different niches. The present study focuses on two species: Diplodus sargus and D. puntazzo, presenting a wide distribution from the Mediterranean to the eastern At...
Article
Full-text available
Morphometric measurements were collected on red porgy, Pagrus pagrus, red seabream, Pagellus bogaraveo, and common dentex, Dentex dentex samples, from four countries along the south European Atlantic coast and the Mediterranean Sea (Portugal, Spain, Italy and Greece). Multivariate statistical analysis was used to discriminate populations. Stepwise...
Article
An evaluation of flatfish discards from bivalve dredge fishing on the south coast of Portugal (Algarve) was undertaken through fishing surveys carried out on board a professional dredge fleet. Data collection of the dredge fishery was carried out between November 2000 and February 2002. The data were compared with information gathered from abundanc...
Article
Truss morphometric measurements were made on white seabream, Diplodus sargus, sharpsnout seabream, Diplodus puntazzo, and striped seabream, Lithognathus mormyrus from Portugal, Spain, Italy and Greece. Univariate and multivariate statistical analyses were used to discriminate populations. Stepwise discriminant analysis yielded a reduced variable se...
Article
Full-text available
The present study checks on the validity of the hypothesis that heterozygosity and the fluctuating asymmetry (FA), common measure of the developmental stability, are linked in populations of wild and cultured stocks of Sparus aurata from five countries. Muscle and liver samples were analysed for variation in 26 allozymes and three microsatellite lo...
Article
A morphometric comparison was made between Sparus aurata (n = 88), Pagrus pagrus (n = 38) and their hybrid S. aurata (female) x P. pagrus (male) (n = 81) using 15 morphometric characteristics. The morphometric characteristics of the hybrids were generally intermediate to those of the parental species. However, characteristics related to the body sh...
Article
Gastric evacuation rates of the gilthead sea bream, Sparus aurata, fed with commercial pelleted food and polychaetes (Nereis diversicolor) were determined under experimental conditions. The estimated gastric evacuation rate for pelleted food was 7.97% h–1, with a total time of digestion of approximately 9 h. The respective values for the natural fo...

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Project (1)
Project
The HIPPONUTRE project is the next, and necessary research step ahead to develop new and relevant information regarding the long snout seahorse, Hippocampus guttulatus aquaculture. This project was designed to detail the existing knowledge and to develop new and most needed technologies to render the long snout seahorse production in captivity viable at a commercial scale. It’s intended to gather valid information regarding the dietary requirements of both, breeding adults and juveniles, which can be readily transposed and used in the species feeding protocols as a means to improve grow and survival rates.