Effects of environmental variables on recruitment of anchovy in the Adriatic Sea

Santojanni, Alberto; Arneri, Enrico; Bernardini, Valeria; Cingolani, Nando; Marco, Mirco Di; Russo, Aniello

doi:10.3354/cr031181

Cited by 74 publications

(68 citation statements)

References 31 publications

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“…Cingolani et al (1996) documented much higher anchovy biomass for the period 1976-1984 than for the period 1987-1992. Santojanni et al (2006) connected these variations with different atmospheric and hydrological variables, but we believe that a coincidence of high primary production between 1980 and 1996, anchovy collapse between 1985 and 1997 and recovery after that, and nutrient changes observed in the Adriatic are connected, which should be carefully investigated in the future.…”

Section: Impact On the Higher Trophic Organismsmentioning

confidence: 99%

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

et al. 2012

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Abstract. Long-term time series of physical and chemical parameters collected between 1960 and 2010 along the Palagruža Sill transect, Middle Adriatic Sea, have been investigated in terms of average water properties and their variability. Nutrients, especially orthophosphates, reached rather high levels of concentration below the euphotic zone between 1991 and 1998, the highest levels in the investigated period. Simultaneously, the N:P ratio, which is normally higher than 25:1, decreased to values less than 16:1 in the euphotic zone, indicating a switch from typical phosphorus to nitrogen-limited preconditioning for the primary production. Higher-than-usual nutrient levels peaking in the mid1990s, coupled with lower-than-usual temperature, salinity, dissolved oxygen and pH values, are presumably related to the flow of the nutrient richer Western Mediterranean waters to the Adriatic below the euphotic layer. These waters, which keep their footprint in the N:P ratio, enter the Adriatic during the anticyclonic phase of the Bimodal Adriatic-Ionian Oscillation (BiOS), which has been uniquely strengthened by the Eastern Mediterranean Transient occurring in the early 1990s. This hypothesis should be confirmed through targeted research and modelling exercises, as it is highly relevant for the biogeochemistry of the Adriatic Sea.

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Section: Impact On the Higher Trophic Organismsmentioning

confidence: 99%

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

et al. 2012

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“…The importance of the correlation between anchovy abundance and recruitment with river freshwater output has already been proved by previous studies (e.g. Lloret al, 2004;Santojanni et al, 2006) and river effects can be also noticeable in semi-enclosed basins (Daskalov, 1999). In order to analyse the relationship between CPUE and river discharge, the spreading of fresh water and the location of haline fronts, the spatial and temporal resolution of CPUE data should probably be different, and greater, compared to that used in the present study.…”

Section: Discussionmentioning

confidence: 74%

“…Evidence from assessments suggests that the collapse was caused by very low recruitment. This was probably due to environmental factors determining the level of recruitment (Cingolani et al, 1996;Santojanni et al, 2006). Since then, total annual catches of anchovy has increased but a complete recovery did not occur.…”

Section: Anchovy Fishery In the Adriatic Seamentioning

confidence: 99%

An observing system for the collection of fishery and oceanographic data

et al. 2007

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Abstract. Fishery Observing System (FOS) was developed as a first and basic step towards fish stock abundance nowcasting/forecasting within the framework of the EU research program Mediterranean Forecasting System: Toward an Environmental Prediction (MFSTEP). The study of the relationship between abundance and environmental parameters also represents a crucial point towards forecasting. Eight fishing vessels were progressively equipped with FOS instrumentation to collect fishery and oceanographic data. The vessels belonged to different harbours of the Central and Northern Adriatic Sea. For this pilot application, anchovy (Engraulis encrasicolus, L.) was chosen as the target species. Geo-referenced catch data, associated with in-situ temperature and depth, were the FOS products but other parameters were associated with catch data as well. MFSTEP numerical circulation models provide many of these data. In particular, salinity was extracted from re-analysis data of numerical circulation models. Satellite-derived sea surface temperature (SST) and chlorophyll were also used as independent variables. Catch and effort data were used to estimate an abundance index (CPUE -Catch per Unit of Effort). Considering that catch records were gathered by different fishing vessels with different technical characteristics and operating on different fish densities, a standardized value of CPUE was calculated. A spatial and temporal average CPUE map was obtained together with a monthly mean time series in order to characterise the variability of anchovy abundance during the period of observation (October 2003-August 2005. In order to study the relationship between abundance and oceanographic parameters, Generalized Additive Models (GAM) were used. Preliminary results revealed a complex scenario: the southern sector of the domain is characterised by a stronger relationship than the central and northern sector where the interactions between the environment and the anCorrespondence to: P. Falco (p.falco@ismar.cnr.it) chovy distribution are hidden by a higher percentage of variability within the system which is still unexplained.GAM analysis showed that increasing the number of explanatory variables also increased the portion of variance explained by the model. Data exchange and interdisciplinary efforts will therefore be crucial for the success of this research activity.

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“…Landings of anchovy have followed cyclic fluctuations over the years, with very high values in the late 1970s-early 1980s, partly attributed to the availability of subsidies from the European Community, and again in the late 2000s; both peaks were followed by a more or less marked decline (Carpi et al, 2015). The first, dramatic collapse was recorded in 1987 and has been attributed primarily to 2 years of very low recruitment, result of adverse environmental conditions: the fishery might have played a role in the disruption of the stock, nevertheless, the decrease in biomass started well before relevant changes in fishing effort were recorded (Santojanni et al, 2006). Sardine landings, on the other hand, after enormous values at the beginning of the eighties around 90,000 tons, decreased dramatically until 2005, when they reached the historical minimum of 1,900 tons.…”

Section: Small Pelagics: Anchovy and Sardinementioning

confidence: 99%

The Saga of the Management of Fisheries in the Adriatic Sea: History, Flaws, Difficulties, and Successes toward the Application of the Common Fisheries Policy in the Mediterranean

2017

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In the past 40 years, the fishery in the Mediterranean Sea has seen numerous changes in technology, fleet composition, effort allocation, and management strategies. In this paper, our aim is to summarize the improvements, and highlight the flaws and difficulties that have characterized fisheries management in the Mediterranean Sea in the past decades. We (the authors) advocate the importance of the regionalization of the Common Fisheries Policy (CFP) in the Mediterranean. We focussed on the Adriatic Sea, with two case studies-the fishery for sardine and anchovy, and the fishery for Nephrops. The former is emblematic as it is one of the most valuable and well-studied fisheries in the Mediterranean but it is also an example of a management process that is slowly bearing fruit. Nephrops, on the other hand, has been facing the same destiny as other stocks in the Mediterranean; namely, its peculiar biology, a complex fishery, a poorly tailored data collection and inadequate assessments, have delayed action until very recent times. We use these examples to cover several aspects of Mediterranean fisheries management: (i) a historical overview of the development of these fisheries and their management; (ii) an overview of the main players involved in the scientific analysis and management process and their current and ideal roles; (iii) the flaws of the current stock assessment system; and (iv) recent developments and potential solutions to comply with the latest reform of the CFP before 2020. We argue that to align Mediterranean management with the CFP and achieve MSY targets, the lack of coordination and definition of roles between the General Fisheries Commission for the Mediterranean, the European Commission Directorate-General for Maritime Affairs and Fisheries, the Scientific, Technical and Economic Committee for Fisheries and the Joint Research Centre need to be resolved. There is a need for adequate assessment models and Carpi et al.CFP Application in the Mediterranean data to answer increasingly complex management questions, as well as regular external review of the stock assessment models to assure their quality. Finally, the need for the implementation of a TAC system as an effective tool for Mediterranean fisheries to achieve sustainability is discussed and advocated.

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Effects of environmental variables on recruitment of anchovy in the Adriatic Sea

Cited by 74 publications

References 31 publications

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

An observing system for the collection of fishery and oceanographic data

The Saga of the Management of Fisheries in the Adriatic Sea: History, Flaws, Difficulties, and Successes toward the Application of the Common Fisheries Policy in the Mediterranean

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