Francisco Rocha

Francisco Rocha
University of Vigo | UVIGO · Department of Ecology and Animal Biology

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100
Publications
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Publications

Publications (100)
Article
Full-text available
The Mayan octopus (Octopus maya) and the American octopus (O. americanus) are the two species that support the octopus fishery on the Campeche Bank. The large-scale fleet catches both species. However, landings are recorded as American octopus in the official statistics, and this causes a problem for the management of the fishery. The large-scale o...
Article
Full-text available
One of the major mechanisms responsible for the animals’ fitness dynamics is fecundity. Fecundity as a trait does not evolve independently, and rather interacts with other traits such as body and egg size. Here, our aim was to correctly infer the macroevolutionary trade-offs between body length, egg length, and potential fecundity, using cephalopod...
Data
The Canary Current Large Marine Ecosystem (CCLME) constitutes one of the four great marine systems of upwelling in the world, being the third in primary productivity and supporting the largest fisheries of the African coast, with an annual production of around 2-3 million tons (Valdés and Déniz-González, 2015). The cephalopod’s fauna of Northwest A...
Article
Full-text available
An extensive review of cephalopod fauna in the Central and North Atlantic coast of Africa was performed based on material collected during 10 research cruises in these waters. In the Canary Current Large Marine Ecosystem (CCLME) area, a total of 378,377 cephalopod specimens was collected from 1247 bottom trawl stations. Of those specimens, 300 were...
Article
Full-text available
A central question in the evolution of life-histories is whether organisms reproduce once or repeatedly. For cephalopods, the main differences between semelparous and iteroparous are based on ovulation pattern and spawning type. The different reproductive strategies in coleoid cephalopods could be related to the habitat in which the species dwell (...
Article
Cephalopods are a diverse group of species, with a high ecological and economic relevance. Despite this, its species diversity has been studied in few places at regional scale. We herein aim to update the current state of knowledge and diversity of cephalopods fauna of the Canary Islands. We carried out a systematic review of the available literatu...
Conference Paper
The Canary Current Large Marine Ecosystem (CCLME) constitutes one of the four great marine systems of upwelling in the world, being the third in primary productivity and supporting the largest fisheries of the African coast, with an annual production of around 2-3 million tons (Valdés and Déniz-González, 2015). The cephalopod’s fauna of Northwest A...
Article
Full-text available
Age and growth of Octopus vulgaris were estimated for the first time by using stylets of 200 specimens (97 males, 103 females) collected from the Tunisian southern coasts (the Gulf of Gabès), between June 2011 and May 2012. Females ranged in age from 215 days (7.5 months) to a maximum of 889 days (29.6 months), corresponding to weights of 380 to 58...
Article
Two octopod species are reported from the Canary Islands (eastern Atlantic Ocean) for the first time: the deep sea four-horn octopus, Pteroctopus tetracirrhus (Delle Chiaje, 1830) and the gelatinous giant octopus, Haliphron atlanticus Steenstrup, 1861. Both female specimens were caught in Tenerife. Haliphron atlanticus is described from fresh remai...
Article
This study reports a detailed anatomical and histological study of the digestive system of Octopus vulgaris. Emphasis was placed on characterising the glands and glandular cells and their distribution throughout the digestive tract. The use of classic histological and histochemical techniques revealed two morphological types of glandular cells: gra...
Chapter
Human activities in continental margins have progressively increased during the last decades, threatening vulnerablemarine ecosystems in many continental slopes, such as cold-water coral reefs, seamounts and canyons. In order to protect these ecosystems and ensure the sustainable management of resources, countries and organizations should endorse e...
Chapter
A total of 16,036 cephalopods belonging to 48 species were caught on the Mauritanian continental shelf and slope, between 80 and 2000 m depth, in November–December of 2007–2010 during the joint Spanish-Mauritanian surveys. Samples were collected using a commercial bottomtrawl. Ommastrephidae was the most abundant family (71.1%) in number and weight...
Article
Full-text available
Two well conserved female specimens of the uncommon soft-scaled squid Lepidoteuthis grimaldii Joubin, 1895 (Lepidoteuthidae, Oegopsida) were caught in Canary Island waters: a maturing female of 580 mm dorsal mantle length found dead on the surface at 27°38'N, 18°01'W (near El Hierro Island); an immature female of 350 mm dorsal mantle length capture...
Article
Full-text available
Octopus vulgaris aquaculture is limited due to poor biological knowledge of the paralarval stages (e.g., digestive system functionality), their nutritional requirements (e.g., adequate live diet) and standardization of rearing techniques. These factors are important in explaining the high mortality rate observed in this developmental stage under cu...
Conference Paper
Este trabajo reporta la primera cita de Abralia (Asteroteuthis) siedleckyi en aguas de Mauritania, ampliando la fauna teutológica en la región del Gran Ecosistema Marino de la Corriente de Canarias (CCLME). Este reporte forma parte de un estudio taxonómico y biogeográfico sobre los especímenes encontrados en las campañas oceanográficas llevadas a c...
Conference Paper
Full-text available
Cephalopods are highly carnivorous and voracious animals from the first day of life. They have a high metabolism and therefore require the addition of food daily. Among the cephalopod Octopus vulgaris is a species with high commercial value worldwide. In the last years there have been a lot of studies about the aquaculture of cephalopods. Despite o...
Poster
Full-text available
Trials were performer with ethanol in order to test their effect as anaesthetic in Octopus vulgaris paralarvae. Ethanol was an effective anaesthetic with limited toxic or stressing effect only at high concentrations (2-3%). Anesthetized specimens show relaxed musculature, non-active chromatophores and ausence of the respiratory processes. Specimens...
Conference Paper
Full-text available
The yolk utilization of Octopus vulgaris paralarvae during the embryonic development has been few studied and little is known about the yolk utilization at different temperatures. For this study we maintained strips of eggs at different temperatures (12, 16 y 18°C). The embryonic development, the total length and the yolk volume were monitored at e...
Poster
Full-text available
Oceanic cephalopods, especially squids, are one of the main animals in oceanic ecosystems and constitute a key group in marine food webs. Despite of their importance a small number of research cruises targeting on this group have been conducted in the Canary Islands. We report herein on the micronektonic component of the pelagic assemblage in the C...
Conference Paper
Full-text available
Cephalopods growth is highly influenced by different factors as the diet, age and temperature. Temperature is the external factor that has biggest influence in the growth of paralarvae. In organisms with planktonic larval period, as the common octopus, larval development and planktonic phase duration are strongly related with the temperature. Tempe...
Conference Paper
Full-text available
INTRODUCTION Oceanic cephalopods, especially squids, are one of the main animals in oceanic ecosystems and constitute a key group in marine food webs. Despite of their importance a small number of research cruises targeting on this group have been conducted in the Canary Islands. We report herein on the micronektonic component of the pelagic assemb...
Conference Paper
Full-text available
A total of 137 cephalopods collected during campaigns Bentart 1995, 2003 and 2006 were studied. Sampling was conducted using an Agassiz trawl (2.01 m wide and 1.12 m high, having a mesh size of 10 mm). The studied area corresponds to the north of Livingston Island and Bellingshausen Sea in the Antarctic Peninsula area. Samplings were made between 4...
Article
Full-text available
Several internal structures have been used to estimate age in the cephalopod Octopus vulgaris, but with limited accuracy. We estimated age by investigating growth increments (rings) in the upper beaks of octopus collected between 2003 and 2010 in the Bay of Naples, Italy (Mediterranean Sea). To validate the daily periodicity of ring deposition, 'th...
Article
Full-text available
The distribution of the common octopus (Octopus vulgaris) in the Mediterranean and Eastern Atlantic waters is evaluated using two presence-only analyses: The maximum entropy model (Maxent) and the ecological niche factor analysis (ENFA). Maxent predicts those geographical areas that satisfy the environmental or abiotic requirements of a species whi...
Article
Full-text available
The veined squid, Loligo forbesii, is found throughout the northeast Atlantic, including the waters off the Iberian Peninsula, and is a socio-economically important cephalopod species, sustaining several small-scale commercial and local artisanal fisheries. This study uses Iberian and Azorean trawl survey and fishery landings data from 1990 to 1992...
Article
Information regarding melatonin production in molluscs is very limited. In this study the presence and daily fluctuations of melatonin levels were investigated in hemolymph, retina and nervous system-related structures in the cephalopod Octopus vulgaris. Adult animals were maintained in captivity under natural photoperiod and killed at different ti...
Book
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Importante obra que sirve tanto como guía de identificación como manual sobre la historia natural de los Moluscos Marinos de Andalucía. Son dos volúmenes de tapa dura con más de 1200 especies de moluscos (con y sin concha) descritas e ilustradas a todo color, cubriendo todas las especies conocidas de la zona. También hay amplios capítulos introduct...
Article
Full-text available
Hermosilla, C. A., Rocha, F., Fiorito, G., González, Á. F., and Guerra, Á. 2010. Age validation in common octopus Octopus vulgaris using stylet increment analysis. – ICES Journal of Marine Science, 67: 1458–1463. Daily periodicity of growth increments in stylets was validated in wild-caught Octopus vulgaris maintained under controlled conditions. I...
Article
Full-text available
Daily periodicity of growth increments in stylets was validated in wild-caught Octopus vulgaris maintained under controlled conditions. It was corroborated by staining the stylets either with oxytetracycline (OTC) or tetracycline (TC), and comparing the number of rings produced with the number of days elapsed. In all, 19 animals (10 males and 9 fem...
Article
Full-text available
Amici Molluscarum 18: 7-11 (2010) 7 Historia Historia Historia Historia de las investigaciones científicas sobre de las investigaciones científicas sobre de las investigaciones científicas sobre de las investigaciones científicas sobre sistemática sistemática sistemática sistemática de de de de cefalópodos en Chile cefalópodos en Chile cefalópodos...
Article
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Cephalopods are increasingly acknowledged as an ecologically important group in Chilean ecosystems, but are also one of their less-known biogeographic components. Notably, this group is represented virtually exclusively by non-endemic species, although we hypothesized that their distribution over the coast should be constrained by similar physical...
Article
This study investigated 14 trace elements (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, V and Zn) in the tissues of the giant squid Architeuthis dux from the Mediterranean and Atlantic Spanish waters. As for other families of cephalopods, the digestive gland and the branchial hearts of Architeuthis showed the highest concentrations of Ag, Cd, Co...
Article
Full-text available
The presence of the non-indigenous species, the black-pygmy mussel Xenostrobus securis, is reported here for the first time in an intense shellfish farming area off Galicia (NW Spain). Very high concentrations of this mytilid bivalve have colonized estuarine waters located at the inner part of the Ria de Vigo. The invasive role of X. securis is dis...
Article
Full-text available
Se estudiaron un total de 28 ejemplares de octópodos en las islas Alejandro Selkirk y Robinson Crusoe, pertenecientes al archipiélago de Juan Fernández (Chile). Los ejemplares fueron identificados como pertenecientes a dos especies no descritas anteriormente (Octopus sp 1 y Octopus sp 2). Los ejemplares de Octopus sp 1 miden entre 117 y 76 mm de Lo...
Article
Full-text available
The small-scale cuttlefish (Sepia officinalis) fishery in Galician waters (NW Spain) was studied using a model based on data obtained from fishers. This model was applied using information obtained from the small-scale Galician fleet in 1998. A total of 139 personal interviews were carried out at 62 Galician ports. This information was used to esti...
Article
Full-text available
The small-scale cuttlefish (Sepia officinalis) fishery in Galician waters (NW Spain) was studied using a model based on data obtained from fishers. This model was applied using information obtained from the small-scale Galician fleet in 1998. A total of 139 personal interviews were carried out at 62 Galician ports. This information was used to esti...
Article
Full-text available
A visible pathological condition located in the arms and mantle of the Hubb octopus Octopus hubbsorum from the Northeast Pacific waters is described for the first time. Histological sections confirmed later stages (fibrosis) of a chronic inflammatory condition of unknown aetiology.
Article
Seasonal variation of octopus (Octopus vulgaris) lipid composition was investigated in four tissues: arm, mantle, ovary and digestive gland. A non-homogeneous fat distribution was observed, with the digestive gland exhibiting a higher (p <0.05) lipid content than the other tissues. The ovary showed a higher (p <0.05) fat content than both muscle ti...
Article
Full-text available
Two ongrowing experiments were conducted using a raft deployed for rearing mussels during summer and winter in the Ria of Vigo, Galicia, NW Spain. Two 3 m × 1.5 m × 6 m galvanized iron ongrowing cages were suspended from this platform, each equipped with dens constructed from PVC pipe. Small common octopus (Octopus vulgaris) were captured by the sm...
Article
Full-text available
The behavioural pattern of sand-covering is observed and described for the first time in the lesser octopus Eledone cirrhosa. The specimen developed a burrowing/burying behaviour which lasted approximately 50 seconds. The burrowing/burying continued until the animal was totally covered except for its eyes. This behavioural pattern is similar to the...
Poster
Full-text available
The aims of the present work are to propose a technique for extracting DNA from beaks and to offer preliminary phylogenetic relationships of T. danae based on DNA partial sequences of the mitochondrial genes cytochrome oxidase I and 16S rRNA.
Poster
Full-text available
The present study was conducted to determine the biochemical composition (DNA, RNA, protein and water content) in wild S. officinalis and its relationship with somatic growth, gonad development and environmental conditions in Ria de Arousa, NW Spain, in order to understand the biochemical variation of cuttlefishes during different seasons of the ye...
Article
Full-text available
The small-scale common octopus (Octopus vulgaris) fishery in Galician waters (NW Spain) was studied using a model based on information obtained from fishers. The Gómez-Muñoz model was applied using information obtained from the artisanal Galician fleet from 1998 to 2000. This information was used to estimate catches per unit of effort (CPUE) and to...
Article
Full-text available
El pulpo es un recurso pesquero tradicionalmente capturado en las costas españolas. Este molusco tiene gran importancia, sobre todo en las pesquerías artesanales, donde sus capturas representan una importante fracción de las ganancias de los pescadores. Sin embargo, y sobre todo este último año, el pulpo ha sido escaso y en algunas comunidades como...
Poster
Full-text available
In this study, we investigate the links between the physical forcing and their effects on the biomass changes in the common octopus population during the last decade. We use the North Atlantic Oscillation (NAO) as a proxy to the climate inter-annual changes at the Northeast Atlantic scale. We also test the responses of the abundance with the local...
Poster
Full-text available
We examined the relationships the recorded location of Architeuthis specimens from 1900 to 2004 and 13 topographical, hydrographical, ecological and Observational variables. A PCA was applied in order to find the set of variables high correlates with the presence of giant squid.
Conference Paper
Full-text available
This study evaluates for the first time the Prestige oil spill effect on the commercial population of the common octopus (octopus vulgaris) by means of changes in its reproductive potential. Specimens of two oil spill affected areas and one non-affected control area were sampled. Potential fecundity and several condition and reproductive indices we...
Conference Paper
Full-text available
This study evaluates the Prestige oil spill effect on the lipid content and composition of commercial population¡ of the€ common octopus (Octopus vulgaris) by means of different biochemical analysis ( total lipid content and different lipid classes) in order to evaluate consequences of hydrocarbons and derivate inputs to the organism This study is...
Conference Paper
Full-text available
This sludy deals with the popualion dynarnlc or a host-parasite system from the endemiotic geographic area affected by the spill oil from Prestige. Both, the infrapopulation dynamic of Aggregata octopiana (Protozoa: Apicomplexa) spoorocysts in fresh preparations and the observed life-cycle strategies in histological sections were studied in wild ma...
Presentation
Full-text available
The present paper analyzes seasonal changes in the lipid composition in several tissues of females Octopus vulgaris caught off Galicia (NW Spain). The analyses centered on the evaluation of total lipids and their classes, and the profiles of fatty acids in three distinct tissues: muscle (arm and mantle), ovary and digestive gland. The total lipid c...
Article
Full-text available
The variation of paralarval abundance in a region subjected to wind-driven upwelling (Ria of Vigo, northwestern Spain) was studied. Research cruises were undertaken during the favourable upwelling season (May to October) in 2000 and 2001. Each cruise included biological and hydrographic sampling and consisted of five stations in waters located to t...
Article
Full-text available
A review of the verified reports to date of Architeuthis spp. showed that 33·9% (115 specimens) of worldwide reports were derived from the north-eastern Atlantic. The sex of each specimen, nature of the report, as well as the season and area of collection are presented. Biological data are presented on the two first males of Architeuthis sp. captur...
Article
A model based on a short fishery statistics survey was applied to estimate catch and catch per unit effort (cpue) of the Galician monkfish (Lophius spp.) trawl fleet during 1998. In all, 35 interviews were conducted with fisheries personnel in ICES Divisions IXa, VIIIc, VIIId, and VIIIe (coastal offshore fishing grounds) and 44 in VIIb, VIIc, VIIj,...
Article
Full-text available
Three specimens of Taningia danae were captured in the northern Spanish (eastern Atlantic) waters in late 2000. The total weights of the animals, two females and one male, were 66, 124 and 19 kg, respectively. Both females were maturing with no trace of eggs in the oviduct. The potential fecundity of the largest female was close to 5 million oval-s...
Article
Full-text available
Three specimens of Taningia danae were captured in the northern Spanish (eastern Atlantic) waters in late 2000. The total weights of the animals, two females and one male, were 66, 124 and 19 kg, respectively. Both females were maturing with no trace of eggs in the oviduct. The potential fecundity of the largest female was close to 5 million oval-s...
Article
Full-text available
Egg masses of the loliginid squid Loligo vulgaris Lamarck, 1798 are attached to hard substratum or branched sessile organisms on the sea bottom. Embryonic development lasts from a few weeks to a few months, depending on the environmental water temperature. Because embryonic statolith growth of L. vulgaris is very sensitive to temperature under labo...
Article
This paper describes the history of cephalopod fisheries in Chile over the past 40 years. Continuous monitoring of three species was undertaken between 1978 and 1999: Loligo gahi, Dosidicus gigas and Octopus mimus. Total cephalopod catches increased from 69tonnes in 1978 (0.13% total mollusc catch) to 3503tonnes in 1996 (3.64%). A maximum haul of 1...
Article
Full-text available
The relationship between the increase of the sea surface temperature observed off the Galician coast and the appearance of a tropical poikilotherm species Argonauta argo in these coasts is discussed. This is the first record of Argonauta argo in the north-west Iberian Peninsula. A female of this species was captured alive near the surface at dusk o...