Jose Antonio Hernando

Universidad de Cádiz | UCA · Department of Biology

Early development of the Adriatic sturgeon Acipenser naccarii from its free embryo after hatching (stage 36), until late embryo stage, when the transition to exogenous feeding starts (stage 45) is described. Special emphasis is given to morphological development and description of the different structures that are formed at each life stage. After h...

The use of different trawl nets is a factor to be considered when analysing historical swept-area research surveys aimed to characterize temporal variations in the relative abundance of demersal resources. If factors that may affect the performance of the bottom trawls were considered, more reliable temporal trends could be established. Due to the...

The sequence and timing of the embryonic development of Adriatic sturgeon (Acipenser naccarii) are described at a constant temperature (17 ± 1 °C), from fertilisation to hatch in a hatchery. Fertilised eggs, obtained from one female and two males, were held in a flow-through system. On the first day, embryos were sampled every 20 min during the fir...

En la zona ístmica de la Ciudad Autónoma de Ceuta se realizó una actividad arqueológica preventiva en el año 2006, en el solar situado en la plaza de África no 3, que deparó una interesante secuencia de época romana, tardorromana, medieval y moderna. Los restos de época preislámica se vinculan a contextos relacionados con el procesado de los recurs...

Las zonas intermareales rocosas tienen un alto grado de variabilidad, tanto por cambios hidrodinámicos en los ciclos mareales, como por la presión de predación y competencia con especies de la zona submareal y del hábitat terrestre. Caracterizar las comunidades biológicas, diversidad, composición y variaciones, así como conocer la influencia de los...

Scorpaena porcus (Scorpaenidae) fue capturada en 3 zonas de intermareal rocoso del litoral gaditano. La ausencia en las capturas de ejemplares maduros sexualmente a lo largo de todo el estudio indica que no utiliza el intermareal rocoso como zona de puesta. Sin embargo, debido a su presencia mantenida en el tiempo consideramos a esta especie como r...

The regulation of minimum legal size (MLS) of catches is a tool widely applied in the management of fisheries resources, although the MLS does not always coincide with the length at first maturity (LFM). The optimization of this management tool requires a series of quality control in fish markets and transportation. A software application has been...

Abstract The performance of robust principal component analysis (RPCA), detrended correspondence analysis (DCA) and non-metric multidimensional scaling (NMDS) with two demersal fish data sets were assessed in terms of their stability to bootstrap-generated sample variation and the method’s ability to reflect a well-known depth gradient. Stability w...

The Strait of Gibraltar is a geographic region between the south of Europe and the north of Africa. On the basis of the geological, geographical and ecological evidence, this is considered a historical region. Prehistoric societies that lived during the Pleistocene and Holocene on both sides of the Strait left behind very similar archaeological rec...

a b s t r a c t The regulation of minimum legal size (MLS) of catches is a tool widely applied in the management of fisheries resources, although the MLS does not always coincide with the length at first maturity (LFM). The optimization of this management tool requires a series of quality control in fish markets and transportation. A software appli...

The reproductive biology of chub mackerel, Scomber japonicus (Houttuyn, 1782) was studied for the first time in Larache coast from January to December 2005. Using gonadosomatic index (GSI) and gonad macroscopic observation, spawning season was estimated to be from December to March and in June and July with a peak in January. The mean total length...

Many species of littoral fish that live in rocky substrates are syntopic, sharing the same coastal habitat. They have similar feeding behaviours and use small hollows as places to hide and spawn. In the present study, we identified a total of 16 resident fish species in a rockpool assemblage in the Gulf of Cádiz and studied their patterns of co-occ...

Size selectivity of the deep water longline used in the black spot seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar was studied with data of four sizes of hooks. Logistic (classic) and Artificial Neural Networks (heuristic) selectivity models were fitted for two experimental fishing trials. Logistic selectivity model was adequate fo...

The Strait of Gibraltar is a geographic region between the south of Europe and the north of Africa. On the basis of the geological, geographical and ecological evidence, this is considered a historical region. Prehistoric societies that lived during the Pleistocene and Holocene on both sides of the Strait left behind very similar archaeological rec...

From so-called Social Archaeology boarded an analysis of the exploitation of marine resources for hunter-gatherer-shellfish and tribal community mode social formations in the historic region of the Gibraltar Strait. His analysis brings us closer to the lifestyles and ways of working of the societies from the Medium Pleistocene to the Early Holocene...

This paper presents the SAGENA Archaeological Research Project, supported by the Regional Ministry of Innovation, Science and Business of Andalusia, through its Excellence programme funds (2008-2011). The main aim of the project is to implement a research agenda on fishing equipment in the ancient world, a subject which has been much neglected in A...

The European Water Framework Directive (WFD; 2000/60/EC) establishes a framework for the protection of all waters. Transitional waters are functional units with fluctuating and unstable dynamics, which leads to a high abundance and species diversity. The reference condition for a water body is the description of the biological quality elements that...

Species and size selectivity of the deep water longline traditionally used in commercial fishing of the black spot seabream (Pagellus bogaraveo) were studied in the Strait of Gibraltar with four sizes of hooks. Black spot seabream contributed up to 88% of the catch by number. Catch and by-catch rates differed for the different hooks and fishing tri...

Analysing historical citations and the specimens preserved in museums, as well as zoological collections in France, Portugal, Spain, and Italy, the historical and current distributions of sturgeons in southern Europe have been studied, using morphological and genetic techniques. Errors were found in the classification of specimens of non-Adriatic o...

Sturgeons are considered "living fossils", sharing many morphological and biological features with ancestral fish. Furthermore, sturgeons are of the utmost interest from an economic perspective, not only for the caviar but for flesh, too. However, the wild populations of the majority of the species are at serious risk of extinction all over the wor...

Background. The deep-water longline fishery of the blackspot seabream, Pagellus bogaraveo, is an economically important fishery in the Strait of Gibraltar, which is a very complex transition ecosystem between the Mediterranean Sea and the Atlantic Ocean with an extreme spatial and temporal variability. This paper presents a series of morphometric r...

Trammel net discards in four southern European areas were considerable, with a total of 137 species (79.7% of the total) discarded 65, 105, 46 and 32 species in the Basque country (Spain), Algarve (Portugal), Gulf of Cadiz (Spain) and Cyclades islands (Greece), respectively. The overall discard rate in terms of catch numbers ranged from 15% for the...

In the present paper, two univariate forecasting techniques were tested to evaluate the short-term CPUE capacity forecast for Pacific halibut, Hippoglossus stenolepis (Pleuronectidae). The first methodology, based on the Box–Jenkins approach (autoregressive integrated moving average models [ARIMA models]), assumes a linear relationship between the...

We quantified the ecosystem effects of small-scale gears operating in southern European waters (Portugal, Spain, Greece), based on a widely accepted ecosystem measure and indicator, the trophic level (TL). We used data from experimental fishing trials during 1997 to 2000. We studied a wide range of gear types and sizes: (1) gill nets of 8 mesh size...

The estuarine fish community index described here is based on data that was collected within Atlantic Andalusian estuaries from several studies (Arias & Drake, 1990; Hernando & Soriguer, 1992; Garrido-Ramos et al., 1997; Hernando et al., 1997; De Sousa, 2002). The metrics were chose base partially on a review of measures included in other estuarine...

Trammel net size selectivity was studied for the most important métiers in four southern European areas: the Cantabrian Sea (Atlantic, Basque Country, Spain), the Algarve (Atlantic, southern Portugal), the Gulf of Cádiz (Atlantic, Spain) and the Cyclades Islands (Mediterranean, Aegean Sea, Greece). These métiers were: cuttlefish (Sepia officinalis)...

1. Age, growth and reproduction in an Atlantic population of the small fish, Aphanius iberus (Cuv. & Val., 1846), from the estuary of the Guadalquivir river were studied. 2. The growth period was from April to September and the annulus on the scales was formed in April. 3. The life-span was short with a winter age-structure of 95.9% 0+ fish, 3.9% 1...

This study was based on examination of 1476 barbels from a first-order stream located in the Guadalquivir River basin (38°N, 4°43′W). This stock comprised nine age groups of male and 11 of females. No growth was recorded between October and March, most occurring in April–June and, to a lesser extent, in July–September. A classification analysis rev...

A total of 1068 eels were examined from a population located in the Guadalquivir river estuary (37°N, 6°25′W). Maximum ages recorded were 4 + (males) and 7+ (females), and maximum lengths were 39-1 cm (males) and 54.1 cm (females). No growth was recorded between November and April, most occurring in May and, to a lesser extent, in June-October. Fem...

The objective of these experiments was to determine juvenile sturgeon ( Acipenser naccarii) ability to capture live prey as well as to determine their feeding preferences when born and raised in captivity and fed on manufactured feeds until the commencement of the experiment. The purpose was to improve their nutrition and to aid in the development...

The relationship between flooding and changes in the size distribution of fish populations in the Palancar stream confirms observations in other rivers. On average, density decreased by 36.2 % and biomass increased by 14.5 %, passing from a period of severe drought to one of heavier than normal rains. Precipitation is the most important of the many...

A total sample of 99 specimens of the vulnerable fish species Cobitis paludica(de Buen, 1930), was collected on a monthly basis from a tributary of the River Guadalquivir between September 1990 and September 1991. Female longevity was 1 year longer than that of males, the former reaching age-class 5+. The diet of C. paludicaconsisted mainly of Ostr...

This paper describes and compares the different reproductive strategies of two cyprinid species, Barbus sclateri (GUNTHER 1868), barbel, and Leuciscus pyrenaicus (GUNTHER 1868), Iberian chub, in the Palancar Stream, SW Spain. B. sclateri only spawns once per year, during June. Intermediate age classes contribute most to the fecundity of the populat...

A study has been carried out of the fisheries of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicholus) of the Iberian South Atlantic region, specifically the Gulf of Cádiz and the Algarve. The perspectives of the study are both biological and socioeconomic, with the starting point being actual catches landed at the various ports of the...

This work presents a method for estimating the significance level of the capture probability when the capture removal method is used in riverine fish populations. The method is based on adjustment of the linear relationship between capture probability and an index of capture efficacy. With this method the population size, the statistic χ2 and the s...

The main objective of this study was to analyse differences and similarities in morphometric characteristics among specimens of the same year class of Acipenser naccarii (Bonaparte, 1836), comparing fish raised either in Italy or Spain. All specimens were Fl of captive broodstock in Italy. Fifteen biometric variables were measured, and three derive...

The aim of this study was to describe meristic characters of hybrid Acipenser naccarii×A. baeri, to be used as the basis for characterizing hybrid specimens in a complementary manner to as described for,4. naccarii by Hernando et al. (1999). Thirty 2+ and 3+ year class individuals from the Region of Lombardy (Italy) were analysed for eight morpholo...

We undertook a systematic evaluation of the lipid, protein, calorie, and fatty acid composition in 35 species of fish, shellfish and molluscs commonly consumed throughout the four seasons of the year in Andalusia, Spain. Using a portion of muscle tissue the following were measured in each study unit: total lipids (extraction using Folch's method an...

Morphometric and genetic methods were used to identify two sturgeon species, Acipenser naccarii Bonaparte, 1836, and A. sturio Linnaeus, 1758, captured in some of the principal rivers of the Iberian Peninsula, including the Guadalquivir. After measuring 25 Iberian specimens from a fishery and several Spanish and Portuguese museums and applying step...

To evaluate in a systematic manner, the fat, protein, caloric, and fatty acids contents of 35 species of fish, seafood and mollusks, usually consumed in Andalucía (Spain). 35 different species, representative of those usually consumed in Andalucía in the course of the four seasons of the year, are studied. In all units of the study, in a portion of...

The age, growth and reproduction of an Atlantic population of Atherina boyeri is discussed on the basis of an examination of 2510 specimens from the Guadalquivir river (37°N, 6°25′W). The life-span was short with a winter age structure of 80·4% in 0+ group, 13·2% in 1 + group and 6·4% in 2+ group. Growth was continuous throughout the year except at...

Radio telemetry was used to study the movements of European eels,Anguilla anguilla, in a small (1.2 ha) lake in southwestern Spain in March and April, 1985. Observations were taken on the locations of 7 eels at least once each 2 h for a combined total of 1713 h. The size of individual activity regions varied from 2700 to 1300 m2. Eels covered a lar...

The recording of the frequency of social behaviour of 6 adult males, 6 adult females anf 4 juveniles of the mosquitofish Gambusia affinis living in captivity showed a circadian rythm for the activities: Gonopodium Erection, Courtship and Aggressive Chase and Threat. The higher level of occurrences was shown between hour 23 of one day and hour 13 of...

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