Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil

Herbst, Dannieli Firme; Hanazaki, Natália

doi:10.1590/1982-0224-20130156

Cited by 43 publications

(14 citation statements)

References 21 publications

(32 reference statements)

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“…Even though different movement behaviors were observed for the studied mullet species, none of the patterns were specific of a studied area. This could be associated to the migratory capability of the species, but there is a need to revise more in depth the reproductive cycle of M. liza linked to the studied wetlands as it has been done for other areas preferred by this species like Lagoa dos Patos or Santa Catarina Region in Brazil (Herbst and Hanazaki, 2014;Viera, 1991). It is also important to consider that the low number of fish studied by area for life history patterns could be masking other patterns that could have been found with a more abundant otolith sample.…”

Section: Discussionmentioning

confidence: 99%

Identification of potential fish stocks and lifetime movement patterns of Mugil liza Valenciennes 1836 in the Southwestern Atlantic Ocean

et al. 2017

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The mullet Mugil liza is the Mugilidae that lives southernmost in the western Atlantic Ocean. Knowledge about migration, movements and identification of stocks of this important fishery resource is scarce. Thus, we aim to study movement patterns and to identify the presence of different fish stocks in the southwestern region of the Atlantic 2 Ocean, using cumulative otolith shape morphometric and microchemical analyses of sagittae otoliths. Specimens (n = 99) were obtained in four coastal areas: Paranaguá Bay in Brazil, Samborombón Bay, Mar Chiquita Coastal Lagoon, and San Blas Bay in Argentina. Otolith shape indices (Circularity, rectangularity, aspect ratio, percentage occupied by sulcus, ellipticity and form factor) were used for stock identification analysis; and otolith microchemistry using LA-ICP-MS (Sr/Ca and Ba/Ca ratios chronological variation) was used for both the analysis of movement behaviors and the identification of fish stocks (otolith edge ratios). Morphometrical indices did not revealed a clear separation among areas. San Blas bay individuals presented otoliths tending to be longer than wider, with a more elliptic shape than the otoliths from other studied areas; also, did not share individuals with the most northern one, Paranaguá Bay in Brazil. The analysis of microchemical lifetime profiles revealed three types of behavior pattern: Type I: most frequent use of estuarine environments; Type II: a fluctuating behavior between estuarine and sea/high salinity waters; Type III: most frequent use of sea/high salinity habitats. Otolith edge analysis did not reveal differences among Sr/Ca and Ba/Ca ratios for the different areas. Thus, it cannot be assured that there is more than one stock in the studied region. Mugil liza revealed different environmental migratory behaviors in the Southwestern Atlantic Ocean showing a facultative use of estuarine waters; hence, the species appears to be mostly coastal with the use of low estuaries, as seen also by the Sr/Ca otolith cores ratios; differing from the general mugilid behavior previoulsy described.

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Section: Discussionmentioning

confidence: 99%

Identification of potential fish stocks and lifetime movement patterns of Mugil liza Valenciennes 1836 in the Southwestern Atlantic Ocean

et al. 2017

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“…This migratory behavior from a freshwater environment to a saltwater environment is highlighted in the respondents reports, which they state influences the taste, which was also reported in other studies (Herbst and Hanazaki 2014; Murrieta 1998; Souza and Barrella 2001). The presence of this fish during the winter season generates much expectation in the coastal communities and involves a special organization of fishers (Herbst and Hanazaki 2014), leading to an increase in the consumption of this species during the winter season. The period when data was collected must have been influenced by this seasonality; and we have to consider that any sampling method carries inherent biases unless we could distribute the sampling effort including several conscutive days all over the year.…”

Section: Preferences and Dietary Restrictions Related To The Ichthyofmentioning

confidence: 99%

Trophic relationships between people and resources: fish consumption in an artisanal fishers neighborhood in Southern Brazil

Castro

Martins

Hanazaki³

2016

Ethnobio Conserv

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The study of dietary consumption is important to understanding the relationship between eating habits and natural resources, which may reflect adjustments and adaptations demanded by local environmental changes. This study aimed to understand the trophic relationships between the local families' diets and the ichthyofauna present in an urban neighborhood of artisanal fishers in southern Brazil (Tijucas, Santa Catarina). Data were collected through semi-structured interviews in 88 households who reported the consumption of 62 types of fish, where the most consumed were the mullet (Mugil spp.) and croaker (Micropogonias furnieri). Fish is still an important source of animal protein for local families. Preferences and aversions observed can be explained by the relationship between environmental factors and cultural aspects that relate to the economic and social context of the community. In the last decade fish consumption was affected by local immigration and by contextual changes affecting local fisheries.

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“…No significant seasonal variations of mullet abundance were observed. This is unusual because it is known that in periods of reproductive aggregation of M. liza the catches of artisanal fisheries increased notably (Vieira et al 2008, Herbst and Hanazaki 2014. This may be associated with the way cast nets operate and the fishing dynamics.…”

Section: Discussionmentioning

confidence: 96%

“…Only in summer the fishermen significantly catch larger mullets when bottlenose dolphins are present. This can be explained by the fact that after the reproductive period (autumn/winter) adult individuals of M. liza move from the marine environment to the estuaries and coastal region of southern Brazil in small and sporadic schools, mixing with juvenile individuals (Herbst andHanazaki 2014, Lemos et al 2014). In this work, the size analysis of individuals caught in summer showed a predominance of juveniles and the occurrence of few adults, only.…”

Section: Discussionmentioning

confidence: 99%

“…According to them, the decrease in water temperature and the increase in salinity in the estuaries, associated with the southern wind that promote the intrusion of marine water in estuaries during the austral autumn act as "triggers" for sexually mature individuals of M. liza runs to the ocean. In this reproductive migration period, called the 'corrida da tainha', artisanal fishermen intensify fishing efforts throughout the southern Brazilian coast, raising the quantities of mullets caught within the estuaries (Vieira et al 2008, Herbst and Hanazaki 2014, Lemos et al 2016, Sant'Ana et al 2017. Nevertheless, water temperature and salinity did not have representative effects on the explicability of the models of occurrence and abundance of mullet in the cast net fishery at TRE.…”

Section: Discussionmentioning

confidence: 99%

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No mullet, no gain: cooperation between dolphins and cast net fishermen in southern Brazil

Santos¹,

Lemos²,

Vieira³

2018

Zoologia

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We report on the interaction between common bottlenose dolphins, Tursiopstruncatus (Montagu, 1821) and cast net fishermen in southern coast of Brazil. The fishery was monitored in the mouth of the Tramandaí River Estuary to investigate the seasonality of catches and their relationships with a set of variables: presence/absence and number of bottlenose dolphins, fishing area, temperature, salinity, wind and water flow direction in the channel. The mullet, Mugilliza Valenciennes, 1836 is the target species and was the dominant fish in the catches (77% of total catch; 50% in frequency; 0.2 ind. x f-1). The use of GLM models helped to reveal that the number of the bottlenose dolphins, time of year (months) and spatial variation of fishing activity were the main factors explaining the presence and abundance of mullet in the fishermen’s catches. The presences of bottlenose dolphins in the fishing area raise the probability of fishermen catch larger number of mullets with smaller fishing effort. However, the size of the mullet is influenced basically by seasonality. The mullets are the “currency” of bottlenose dolphins and fishermen interaction. There are reasons for concern about the sustainability of the southern Brazilian M.liza stock, once the decrease of this fishing resource can lead this rare and traditional fishery to the extinction.

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Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil

Cited by 43 publications

References 21 publications

Identification of potential fish stocks and lifetime movement patterns of Mugil liza Valenciennes 1836 in the Southwestern Atlantic Ocean

Identification of potential fish stocks and lifetime movement patterns of Mugil liza Valenciennes 1836 in the Southwestern Atlantic Ocean

Trophic relationships between people and resources: fish consumption in an artisanal fishers neighborhood in Southern Brazil

No mullet, no gain: cooperation between dolphins and cast net fishermen in southern Brazil

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