IPMA - DMRM - Relatórios Científicos e Técnicos do IPMA
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- NUTRITIONAL VALUE OF CEPHALOPODS: A REVIEWPublication . Batista, Irineu; Pires, Carla; Instituto Português do Mar e da AtmosferaRecently there has been a growing demand for cephalopods (octopuses, squids, and cuttlefishes), as well as an increase in prices. Cephalopods consumption dates back to ancient times and still remained very popular in various regions of the world. However, lately cephalopods are often included on the menus of many restaurants and are used as ingredients in the preparation of many dishes. This worldwide demand for cephalopods and their high commercial value has led to thepublication of an increasing number of studies on the chemical composition and nutritional value of these species. Thus, this report is a literature review of works published worldwide since 2010.
- PONTO DE SITUAÇÃO DOS BANCOS DE BIVALVES NA COSTA SUL PORTUGUESAPublication . Gaspar, Miguel; Moura, Paula; Pereira, Fábio; Instituto Português do Mar e da AtmosferaA bivalve survey along the Portuguese south coast was carried out, between 2 and 12 of June 2014, aiming at assessing the status of the bivalve beds of the commercial species, namely the white clam (Spisula solida), striped venus (Chamelea gallina), razor clam (Ensis siliqua) and surf clam (Donax trunculus). The mean fishing yield observed for white clam, striped venus and surf clam showed a positive and highly significant evolution suggesting the possibility of increasing their daily quotas for both local and coastal vessel segments. On the contrary, for razor clam a significant decrease was observed and therefore the interdiction of its exploitation during the next two years is proposed.
- FIRST STEP FOR IMPLEMENTATION OF VISUAL ASSESSMENT OF THE MESENTERIC FAT CONTENT OF HORSE MACKEREL, TRACHURUS TRACHURUS (LINNAEUS, 1758), IN THE PORTUGUESE COASTPublication . Costa, Ana Maria; Instituto Português do Mar e da AtmosferaThe objective of this study was to visually obtain the amount of mesenteric fat content and its relationship with length and maturity cycle of horse mackerel in three different regions. Between January and December 2015, a total of 3124 individuals (1467 males, 1439 females and 218 unsexed or indeterminate) were collected at Matosinhos, Peniche and Portimão fish auctions, with total lengths between 11.1 and 43.9 cm. A sex ratio of 1:0.98 in favor of males was obtained, with small non-significant differences in fat content between sexes. A significant inverse relationship was found between the amount of mesenteric fat and the phase of the maturity cycle, corresponding also to a significantly relationship between fat and fish condition. During the spawning season, in the 1st quarter of the year, most of the fish had practically no mesenteric fat, whereas in the resting season, corresponding to the summer months, the individuals presented the highest fat content. During the summer months the leanest specimens were recovering, while the highest fat content was recorded in maturing individuals. These observations were common to the three zones studied. The visual assessment of the amount of mesenteric fat is a quick and easy technique, well-suited for use at sea, in opposition to the determination of lipid content, which is more expensive and time consuming.
- O LABORATÓRIO DE ESCLEROCRONOLOGIA E OS ESTUDOS DE IDADE E CRESCIMENTO DE RECURSOS DA PESCAPublication . Farias, Inês; Soares, Eduardo; Moreno, Ana; Ferreira, Ana Luísa; Silva, Andreia; Serra-Pereira, Bárbara; Dinis, David; Morais, Delfina; Silva, Dina; Santos, Eduardo; Meneses, Isabel; Ferreira, Maria João; Lagarto, Neide; Gonçalves, Patrícia; Alpoim, Ricardo; Dores, Sandra; Garrido, Susana; Moura, Teresa; Azevedo, Manuela; Figueiredo, Ivone; Instituto Português do Mar e da AtmosferaThe Laboratory of Sclerochronology and the age and growth studies of fishing resources A brief description of the growth studies developed by IPMA, I.P. is given in this report, with emphasis on the halieutic species currently studied both within the scope of the National Programme of Biological Sampling (under the EU/DG Fisheries’ Data Collection Framework (DCF)) as of other research projects and research lines of interest for the Institute. With the aim of disseminating the importance of the multiple growth studies and of their application to improve the knowledge on the biology and dynamics of the commercially exploited species, a summary of the techniques and methodologies applied in the Laboratory of eclerochronology is included.
- Modelação ecossistémica: o papel da sardinha no ecossistema IbéricoPublication . Dorota Szalaj; Wise, Laura; Silva, Alexandra; Garrido, Susana; Instituto Português do Mar e da AtmosferaThe national project SARDINHA2030, initiated in January 2024, aims to develop research that allows understanding and better predicting the pressures and impacts of various components of the pelagic ecosystem, contributing to the sustainability and resilience of the fisheries resources involved in purse seine fishery. Among other tasks, directly related to researching the dynamics of populations of target species in the fishery and the factors influencing their variability, it is intended to include ecosystem information in the development of harvest strategies for sustainable purse seine fishery’s management. To achieve this objective, it will be necessary to assess the impact of interspecific relationships and fishing on the combined dynamics of pelagic fish stocks, estimating trophic indicators and biological reference points that incorporate ecosystem dynamics. This document explores information regarding the role of sardine in the Atlantic Iberian ecosystem, using as basis the ecosystem models developed for the distribution area of the Iberian sardine. It compares the natural mortality assumed in the assessment model with the mortality estimated in the ecosystem model of the Portuguese continental shelf, evaluates the role of sardines as a key low trophic level species and estimates the value of sardine biomass that is needed to ensure the ecosystem sustainability. During the project, the ecosystem model will be updated, revising diet matrices to represent as faithfully as possible the diets of all ecosystem organisms, considering ontogenetic variations in diet for the most relevant ones, especially those transitioning from an exclusively planktivorous diet to a piscivorous diet. This ecosystem model will support the sustainable exploitation of the low trophic level species and contribute to ensuring that the impact of fishing on exploited species does not negatively affect the remaining components of the ecosystem.
- A review of the nutritional value of crustaceansPublication . Pires, Carla; Batista, Irineu; Instituto Português do Mar e da AtmosferaCrustaceans are among the most appreciated and valued fishery products. The extraordinary development of aquaculture production of crustaceans, particularly shrimp, surpassed, in 2014, the volume of catches. The wide availability of crustaceans on the world market has led to an increase in consumption representing 11 % (2.2 kg) of world per capita fish consumption, which reached 20.5 kg in 2019. This work presents a bibliographic review of the most relevant works, published in the 2010s, on the nutritional value of crustaceans. The muscle fraction of crustaceans has protein contents between 10.8 and 23.5 % and fat between 0.3 and 4.4 %. In some crab species, the hepatopancreas and roe are highly prized and have protein contents in the ranges of 7.6-20.1 % and 11.8-28.7 %, respectively. These tissues generally have fat contents in the range of 3.1-36.7 % in the hepatopancreas and 0.6-24.9 % in the roe. In general, the n-3/n-6 ratio in salt and brackish water crustaceans is greater than one. Crustaceans are also good or excellent sources of several elements, especially Cu, Zn and Se.
- Inquérito aos Pescadores Profissionais de Peixes Anádromos no Troço Internacional do Rio Minho/Miño: Considerações sobre o rio, a pesca e a sua gestãoPublication . Yorgos Stratoudakis; Carlos Antunes; Instituto Português do Mar e da AtmosferaThis report describes the fieldwork and summarizes the results of a questionnaire survey that was performed with fishers for anadromous species in the international segment of river Minho/Miño (TIRM) during 2021. The main survey objective was to obtain and systematize individual fisher opinions in relation to a proposal of spatial reorganization of the anadromous fishing activity in TIRM. It was also seen as an opportunity to listen to local fishers on other aspects of management and fishing in this river. The survey, based on a similar study performed in 2019 in the river Mondego, was performed by two members of the Portuguese delegation of the permanent international committee for river Minho (CPIRM), within the scope of their advisory function and with a mandate from CPIRM. Fieldwork was performed with the assistance of local fisher Associations (Portugal) and Confrarias (Spain). The publication of this report, after a presentation of early results to CPIRM and the fisher associations, allows free online consultation by interested stakeholders. It is worth noting that the results section aims to present exclusively a synthesis of aggregate fisher replies, while in the discussion some co-author opinions are also presented.
- Relatório da Campanha de Mar “SAT_UHRS_2022”Publication . Brito, Pedro; Noiva, João; Rosa, Marcos; Batista, Luís; Terrinha, Pedro; Instituto Português do Mar e da AtmosferaThis report describes the activities of the SAT_UHRS_2022 sea campaign carried out from May 10 to 15, 2022, aboard the RV Diplodus, operating from the port of Sesimbra. The main objective of this campaign was to carry out sea acceptance tests (SAT) for new components that were recently integrated into the ultra-high resolution seismic (UHRS) reflection data acquisition system of the Marine Geophysics Laboratory (SeisLab) of the Division of Marine Geology and Georesources (DivGM) of IPMA. Additionally, it aimed at: 1) evaluating the hypothesis of the Minitrace II to operate as a trigger controller of the multibeam and Topas systems in order to minimize acoustic interference; 2) evaluating whether the anomalous operation of the multibeam detected in the last campaigns can be related to its joint assembly with the TOPAS transducer and 3) testing data acquisition simultaneously with the Topas system and the new UHRS equipment. During the campaign, about 63 km of data were acquired (including the 3 systems: single-channel, multi-channel and Topas), corresponding to about 17 km of multi-channel lines, 41 km of single-channel lines (including the 2 streamers) and 4 km of parametric echosounder lines (Topas).
- A review of the nutritional value of bivalve molluscs and gastropodsPublication . Batista, Irineu; Pires, Carla; Instituto Português do Mar e da AtmosferaIn the 2010s, world bivalve molluscs production experienced rapid growth, with a mean increasing rate of 277 thousand tonnes per year during this decade. In addition to the high significance of bivalve molluscs consumption at local or regional level, there was also a significant volume of transactions whose share was about 3.1 % of total international exports of fishery products in 2019. Bivalve molluscs and gastropods are highly appreciated in particular for their sensory characteristics (taste and texture). Fat content of bivalve molluscs varies between 0.1 and 3.3 % and protein content ranges between 7.3 and 17.9 % while fat content of gastropods may attain 9.0 % and protein content between 11.2 and 23.2 %. Furthermore, the free amino acids of these molluscs give them unique taste characteristics. This report presents a bibliographic review of worldwide published work on the nutritional value of bivalve molluscs and gastropods in the 2010s.
- Validation of the macroscopic maturity stages for blue jack mackerel, Trachurus picturatus (Bowdich, 1825), according to histological examinationPublication . Feijó, Diana; Silva, Carmo Nunes; Correia, Georgina; Inácio, Mónica; Abreu, Paula; Costa, Ana Maria; Instituto Português do Mar e da AtmosferaThe assessment of fisheries resources requires the correct identification of fish maturity stages. The methodologies applied should be standardised and all uncertainty regarding macroscopic identification should be validated by microscopic observation. This work proposes a microscopic maturity scale for the blue jack mackerel (Trachurus picturatus, Bowdich, 1825), based on individuals collected by commercial bottom trawl in northern Portugal. After assigning the macroscopic maturity stage, the gonads were processed for histological observation. The slides were observed and the gonads were classified into 6 stages according to Walsh et al. (1990). The corresponding macroscopic and microscopic maturity stages were described. The correspondence to the new maturity scale presented at WKASMSF (ICES, 2018) is also presented, which is mandatory when reporting maturity data to ICES databases (since the 1st. January 2020).