Stock discreteness in herrings: A conceptual revolution

Smith, Peter; Jamieson, Alan J.

doi:10.1016/0165-7836(86)90004-4

Cited by 72 publications

(47 citation statements)

References 38 publications

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“…Ryman et al 1984, Smith & Jamieson 1986, Hedgecock et al 1989, Kinsey et al 1994, Tudela 1999. None of these studies found any evidence of genetic differences among their samples.…”

Section: Discussionmentioning

confidence: 98%

Can otolith chemistry detect the population structure of the shad hilsa Tenualosa ilisha? Comparison with the results of genetic and morphological studies

Milton¹,

Chenery²

2001

Mar. Ecol. Prog. Ser.

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The stock structure of the valuable tropical shad Tenualosa ilisha ('hilsa') has been studied in Bangladesh and India by analysing morphometric and genetic data. However, these studies had a narrow geographic scope and their results conflict. We made a comprehensive study of the stock structure of hilsa with otolith microchemistry in conjunction with complementary genetic and morphometric studies of the same fish. We examined the trace-element composition of the otolith cores of hilsa with laser-ablation inductively coupled plasma mass spectrometry. The otoliths of fish from 19 collections at 13 sites in Bangladesh and 6 collections at 4 sites from elsewhere within the species' range (Kuwait, SE India, Myanmar and Sumatra) were analysed for 8 trace elements. Samples were collected from Bangladesh mainly during 2 comprehensive surveys (1996 and 1997). When these data were analysed separately, there were significant differences in otolith composition among sites. However, when both years' data were analysed together, there were few significant differences among sites, and some sites separated by hundreds of kilometres that were sampled in different seasons and years had very similar compositions. This was in spite of both large seasonal intra-site and between-site differences in water chemistry. Repeat samples from 5 sites (4 in Bangladesh) showed that differences in otolith composition at a single site were significant and of similar magnitude to that found among sites. Our results support the conclusion from allozyme studies that there is extensive movement and mixing of hilsa throughout Bangladesh, and therefore the population should be managed as a single stock. Genetic and otolith data both showed that hilsa from SE India and Myanmar were not significantly different from fish collected in coastal areas of Bangladesh, and suggest that hilsa in the Bay of Bengal were a single stock. Both methods also separated fish from Sumatra and Kuwait from other sites, providing strong evidence of separate stocks in those regions. In contrast, morphometric studies separate fish from several nearby sites in Bangladesh, but these differences are likely to be largely due to phenotypic variability and are unlikely to be geneticallybased. Our results suggest that otolith microchemistry may be a good proxy for genetic structure at large scales where differences in water chemistry are highly likely. However, for sedentary species and those without distinct spawning and non-breeding areas, it requires both comprehensive and repeated sampling at finer scales before any confidence should be placed in the results.

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“…Ryman et al 1984, Smith & Jamieson 1986, Hedgecock et al 1989, Kinsey et al 1994, Tudela 1999. None of these studies found any evidence of genetic differences among their samples.…”

Section: Discussionmentioning

confidence: 98%

Can otolith chemistry detect the population structure of the shad hilsa Tenualosa ilisha? Comparison with the results of genetic and morphological studies

Milton¹,

Chenery²

2001

Mar. Ecol. Prog. Ser.

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“…Thus, in a sense they are evolutionary 'losers' . On the other hand the dynamic balance population concept by SMITH & JAMIESON ( 1986) MCQUINN (1997) concluded that neither the discrete population concept nor the dynamic population concept adequately explains all data associated with herring population structure and dynamics . He found that the weakness in the dynamic balance population concept lies in the lack of an explanation for the temporal persistence and integrity of populations.…”

Section: State-dependent Migrations In Relation To Population Conceptsmentioning

confidence: 99%

“…Herring along the Pacific (HOURSTON 1982) and Atlantic (WHEELER & WINTERS 1984) coasts of the North-American continent have high return rates to specific spawning grounds, although there is no clear evidence for natal homing as in anadromous fish (HARDEN JONES 1968, NORTHCOTE 1984THORPE 1988). Based on observed geographical spawning distributions and data on return rates at spawning grounds, three possible population concepts have been proposed to describe the population dynamics of herring: the discrete population (ILES & SINCLAIR 1982, SINCLAIR 1988) the dynamic balance population (SMITH & JAMIESON 1986) and the metapopulation (MCQUINN 1997).…”

Section: State-dependent Migrations In Relation To Population Conceptsmentioning

confidence: 99%

Effects of fish length and condition on spawning migration in Norwegian spring spawning herring (Clupea harengusL.

Slotte¹

1999

Sarsia

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The photo on the front page is taken by Per Eide Samfoto, Oslo, Norway ISBN 82-7744-050-2 PREFACE The fishery and its management is like all other catch activities dependent on knowledge of the animal' s mode of living. The questions of where and when to find the fish have circulated for centuries. In earlier periods the fishermen were prevented from exploring the open seas, due to the condition of their boats and fishing equipment. Thus, during these periods it was particularly important for them to know the times and areas at which fish were occurring in coastal waters.Throughout centuries the coastal communities in Norway developed based on the knowledge of where and when the herring and other fish occurred along the coast. In general, the herring aggregated in certain areas along the Norwegian coast and at certain times of the year, especially in connection with the spawning in winter. However, the migration patterns of the herring was not always to be relied on, as indicated by the following quotations (after Rollefsen 1966 During the present century it was confirmed that the herring aggregating along the Norwegian coast in winter belong to the Norwegian spring spawning herring stock, which together with the Icelandic spring and summer spawners form the Atlanto-Scandian herring group. The Norwegian spring spawning herring is known as one of the largest fish stocks in the world, which may cover large parts of the north-eastern Atlantic migrating between nursery areas, feeding areas, wintering areas and spawning areas. However, the stock size has fluctuated and the migration pattern has varied over the years. One may say that this herring stock moves in mysterious ways. Despite extensive research efforts on this stock in the past, there exist no definite explanations to its migration behaviour. Thus, studies on the migrations of Norwegian spring spawning herring are still relevant, and will probably be so for many years ahead.In the present thesis I aim to increase the knowledge of factors influencing the spawning migration of Norwegian spring spawning herring. I hypothesise that both the time and location of spawning is influenced by the following aspects of population structure: the age and length composition, the composition with respect to nursery area of origin, and composition with respect to body condition (amount of energy reserves). The main period of my analyses is the 1990s, when spawning migration have commenced from the wintering area in the Vestfjord system, northern Norway (68°N), towards the spawning grounds situated between 58°and 70°N.

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“…There is a large body of literature related to the structure of fish populations and their degree of connectivity and whether they are structured into discrete populations as advocated by , as single panmixic units as advocated by Smith and Jamieson (1986), or as metapopulations as McQuinn (1997) argues (Fig. 2).…”

Section: Subspecies Structuringmentioning

confidence: 99%

A spatial approach to understanding herring population dynamics

Huse

2016

Can. J. Fish. Aquat. Sci.

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Johan Hjort's so-called second recruitment hypothesis addressed the fate of offspring that drift out of areas suitable for their survival. This hypothesis has forged the concept of a population as a closed life cycle, making countercurrent adult spawning migration a necessary mechanism in balancing larval drift. The Norwegian spring-spawning (NSS) herring stock (Clupea harengus), the object of much of Hjort's work, is spread over large areas in the Northeast Atlantic, with spawning along the Norwegian coast, nursery areas in the Barents Sea, feeding areas in the Norwegian Sea, and overwintering areas outside northern Norway. Understanding the spatial dynamics of highly migratory fish stocks such as the NSS herring, therefore, is critical to understanding their population dynamics. Here I review hypotheses on the spatial dynamics of fish focusing on NSS herring and discuss consequences for population dynamics and interactions with other ecosystem components. The results illustrate the key role that strong herring cohorts play both as predators in the Barents and Norwegian seas and as prey on the overwintering and spawning grounds along the Norwegian coast. It is advocated that spatial full life cycle models should be developed for key fish stocks as a meeting place for model assumptions and observations and as a test bed for a multiple hypothesis testing approach.Résumé : La thèse communément appelée « deuxième hypothèse de recrutement » de Johan Hjort abordait le destin de la progéniture qui dérive vers l'extérieur de zones convenables pour sa survie. Cette hypothèse est à la base du concept de la population comme cycle vital fermé, qui rend nécessaire la migration à contre-courant d'adultes en frai pour compenser la dérive des larves. Le stock de harengs (Clupea harengus) norvégiens frayant au printemps (NSS), l'objet d'une bonne partie des travaux de Hjort, couvre de vastes superficies dans le nord-est de l'Atlantique, dont des aires de frai le long des côtes norvégiennes, des aires d'alevinage dans la mer de Barents, des aires d'alimentation dans la mer de Norvège et des aires d'hivernage au large de la Norvège septentrionale. La compréhension de la dynamique spatiale de stocks de poissons hautement migrateurs comme les harengs NSS est donc d'importance clé pour la compréhension de la dynamique de leurs populations. J'examine les hypothèses touchant à la dynamique spatiale des poissons en mettant l'accent sur le hareng NSS et je discute des conséquences pour la dynamique des populations et les interactions avec d'autres composantes de l'écosystème. Les résultats illustrent le rôle clé que de fortes cohortes de harengs jouent aussi bien comme prédateurs, dans les mers de Barents et de Norvège, que comme proies, dans les aires d'hivernage et de frai le long des côtes norvégiennes. Il est recommandé que des modèles spatiaux de l'ensemble du cycle biologique soient élaborés pour des stocks de poissons clés, comme lieu de rencontre pour les hypothèses de modélisation et les observations et comme banc d'e...

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Stock discreteness in herrings: A conceptual revolution

Cited by 72 publications

References 38 publications

Can otolith chemistry detect the population structure of the shad hilsa Tenualosa ilisha? Comparison with the results of genetic and morphological studies

Can otolith chemistry detect the population structure of the shad hilsa Tenualosa ilisha? Comparison with the results of genetic and morphological studies

Effects of fish length and condition on spawning migration in Norwegian spring spawning herring (Clupea harengusL.

A spatial approach to understanding herring population dynamics

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