Environmental conditions conducive to anchovy (<i>Engraulis encrasicolus</i>) spawning in the Adriatic Sea

Zorica, Barbara; Vilibić, Ivica; Keč, Vanja Čikeš; Šepić, Jadranka

doi:10.1111/fog.12002

Cited by 35 publications

(37 citation statements)

References 37 publications

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“…These factors have a strong influence upon adult populations, particularly upon place and timing of their reproduction (Lloret et al, 2004;Zorica et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Distribution and abundance of eggs and estimation of spawning stock biomass of anchovy,Engraulis encrasicolus(Linnaeus, 1758), in the south-eastern Adriatic Sea

Mandić¹,

Regner²,

Đurović³

et al. 2015

J. Mar. Biol. Ass.

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Seasonal distribution and abundance of anchovy eggs were analysed during three scientific cruises carried out from summer 2006 to summer 2007 in the Boka Kotorska Bay, and one cruise in July 2008 in the open waters of the south-eastern Adriatic Sea. Daily egg production method (DEPM) was applied for the first time for estimation of the anchovy spawning stock biomass in the south-eastern Adriatic Sea. The daily egg production was 13 -581 eggs day 21 within the bay, and 42 -110 eggs day 21 in the open waters. Anchovy egg abundance was highest in spring inside the Bay of Kotor (one of the innermost and eutrophic sub-bays of the Boka Kotorska Bay), which indicates that the conditions for anchovy spawning are very favourable in this part of the Adriatic Sea, even when temperatures are below the optimum. This study has shown that the Boka Kotorska Bay is an area of very intensive spawning of anchovy, and that small-size anchovies live and spawn in the bay, and after spawning migrate towards open waters. The length at which 50% of anchovy were mature (L50) was calculated as 9.28 for females and 9.02 for males. Spawning stock biomass was at a stable level during the period of investigation.

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“…These factors have a strong influence upon adult populations, particularly upon place and timing of their reproduction (Lloret et al, 2004;Zorica et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…The river runoff influences the spawning and the survival rate of anchovy in its early life stages which consequently affect recruitment (Lloret et al, 2004;Zorica et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Distribution and abundance of eggs and estimation of spawning stock biomass of anchovy,Engraulis encrasicolus(Linnaeus, 1758), in the south-eastern Adriatic Sea

Mandić¹,

Regner²,

Đurović³

et al. 2015

J. Mar. Biol. Ass.

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“…Anchovy is an euryhaline species widely spread over the entire basin (Sinovcic, 1978;Palomera et al, 2007;Morello and Arneri, 2009;Zorica et al, 2013). The spawning period goes from April to October (Regner, 1996), with two peaks in May-June and August-September (Regner, 1972;Sinovcic and Zorica, 2006;Morello and Arneri, 2009;Zorica et al, 2013).…”

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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“…They are serial batch spawners: the spawning takes place in the warmer months, between April and October (Regner 1996), with peaks in MayJune and August-September (Sinovčić and Zorica 2006, Morello and Arneri 2009, Zorica et al 2013. Recent surveys performed in the Adriatic Sea within the Sardone Project found larvae as early as February and as late as November, indicating an extension of the spawning season in the last few years (SARDONE 2010).…”

Section: Biologymentioning

confidence: 99%

A joint stock assessment for the anchovy stock of the northern and central Adriatic Sea: comparison of two catch-at-age models

Carpi¹,

Santojanni²,

Donato³

et al. 2015

Sci. Mar.

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Summary: Anchovy (Engraulis encrasicolus, L.) is one of the most important commercial species of the northern and central Adriatic Sea, as well as one of the most productive fisheries in the whole Mediterranean. In the Adriatic Sea the stock of anchovy is shared between Italy, Croatia and Slovenia. A joint stock assessment was carried out using catch data from all the fleets for the time interval . Analyses were performed using estimates of natural mortality at age obtained by means of two different methods and two population dynamics methods based on the analysis of catch-at-age data: LaurecSheperd virtual population analysis (VPA) and integrated catch-at-age (ICA), both tuned to acoustic estimates of abundance. Gislason's estimates for natural mortality appeared to be more realistic and were thus preferred for short-lived species. The general trend of biomass and fishing mortality is similar for the two models, highlighting the major collapse of the stock in 1987. Nevertheless, ICA has enough flexibility to combine all the data available without adding too much complexity in comparison with a VPA approach and seems to perform better in terms of the spawning stock biomass/recruitment relationship and diagnostics (i.e. the retrospective pattern). For the stock status, the exploitation rate from ICA is higher than the suggested threshold of 0.4 proposed by Patterson for small pelagic species.Keywords: Engraulis encrasicolus, Adriatic Sea, age-structured stock assessment, ICA, natural mortality, stock collapse.Evaluación conjunta de la población de la anchoa del Mar Adriático septentrional y central: comparación entre dos métodos de dinámica poblacional Resumen: La anchoa (Engraulis encrasicolus, L.) es una de las especies comerciales más importantes del mar Adriático central y septentrional, a la vez que es una de las actividades pesqueras más productivas en todo el Mediterráneo. La población de anchoa en el mar Adriático es compartida por Croacia, Italia y Eslovenia: una evaluación conjunta de la población fue realizada usando los datos de captura de todas las flotas para el periodo 1975-2009. Se efectuaron análisis usando estimaciones de la mortalidad natural por edad obtenidos mediante dos métodos diferentes y dos métodos de dinámica poblacional basados en el análisis de datos de captura por edad: Análisis de Población Virtual (VPA) de Laurec-Sheperd y Análisis de Captura Integrada por Edad (ICA), ambos acordados en las estimaciones acústicas de la abundancia. Las estimaciones de mortalidad natural de Gislason aparentaban ser más realísticas y por lo tanto daba preferencia a especies de vida corta. La tendencia general de la biomasa y de la mortalidad por pesca es similar en los dos modelos, destacando la fuerte disminución de la población en 1987. Sin embargo, ICA permite una flexibilidad suficiente para combinar todos los datos disponibles sin agregar excesivas complejidades con respecto al enfoque VPA y aparenta un mejor desempeño en términos de relación de SSB-R y en términos of diagnósticos (por ejemplo: ...

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Environmental conditions conducive to anchovy (Engraulis encrasicolus) spawning in the Adriatic Sea

Cited by 35 publications

References 37 publications

Distribution and abundance of eggs and estimation of spawning stock biomass of anchovy,Engraulis encrasicolus(Linnaeus, 1758), in the south-eastern Adriatic Sea

Distribution and abundance of eggs and estimation of spawning stock biomass of anchovy,Engraulis encrasicolus(Linnaeus, 1758), in the south-eastern Adriatic Sea

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

A joint stock assessment for the anchovy stock of the northern and central Adriatic Sea: comparison of two catch-at-age models

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