Indirect signals of spawning aggregations of three commercial reef fish species on the continental shelf of Bahia, east coast of Brazil

França, Aline Rocha; Olavo, George

doi:10.1590/s1679-87592015087506303

Cited by 15 publications

(11 citation statements)

References 10 publications

(14 reference statements)

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“…unicornis in new moon, and Chlorurus microrhinos in full moon). This could be related to reproductive cycles, and suggested the potential of identifying reproductive patterns from landings signals [ 62 ], or helping to guide sampling to determine reproductive cycles. In support, forktail rabbitfish, Siganus argenteus , had increased proportional contributions during the full moon phases, and supporting studies have confirmed the full moon corresponds with reproductive behavior [ 63 ].…”

Section: Discussionmentioning

confidence: 99%

Human and environmental gradients predict catch, effort, and species composition in a large Micronesian coral-reef fishery

et al. 2018

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The consistent supply of fresh fish to commercial markets may mask growing fishing footprints and localized depletions, as fishing expands to deeper/further reefs, smaller fish, and more resilient species. To test this hypothesis, species-based records and fisher interviews were gathered over one year within a large, demand-driven coral-reef fishery in Chuuk, Micronesia. We first assessed catch statistics with respect to high windspeeds and moon phases that are known to constrain both catch and effort. While lower daily catch success was predicted by higher windspeeds and greater lunar illumination, total daily landings fluctuated less than fishing success across environmental gradients. Instead, daily landings were mainly driven by the number of flights from Chuuk to Guam (i.e., international demand). Given that demand masked local drivers of overall catch volume, we further evaluated species-based indicators of fisheries exploitation. Most target species (75%) had either a positively skewed size distribution or proportional contributions that were dependent upon favorable conditions (i.e. season and moon phases). Skewed size distributions indicated truncated growth associated with fishing mortality, and in turn, suggested that size-based management policies may be most effective for these species. In contrast, environmentally-constrained catch success indicated species that may be more susceptible to growing fishing footprints and may respond better to gear/quota/area policies compared to size policies. Species-based responses offered a simplified means to combine species into fisheries management units. Finally, a comparison of commercial and subsistence landings showed higher vulnerability to fishing among species preferentially targeted by commercial fisheries, offering new insights into how commercial harvesting can disproportionately impact resources, despite having lower annual catch volumes.

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Section: Discussionmentioning

confidence: 99%

Human and environmental gradients predict catch, effort, and species composition in a large Micronesian coral-reef fishery

et al. 2018

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“…In the context of this study, outliers and far outliers represented fisheries that had excelled in a high CPUE. The spatial (site) and temporal (month) origins of those catches were identified and considered as sites and times of possible aggregations (França & Olavo, 2015).…”

Section: Exploratory Analysis Of Catch and Effort Datamentioning

confidence: 99%

“…This expected increase in catch (number/density), of up to four times (Domeier, 2012) or at least three times (Colin, Sadovy & Domeier, 2003) for PE/AL. Thus, in this study, we adopted as FSA indicators the presence of outliers and far outliers, which were usually much larger than four times the average calculated for each species (França & Olavo, 2015). This may be particularly useful in situations of depletion, when lower densities can make indicators of FSA sites less conspicuous.…”

Section: Fishing Catch and Effortmentioning

confidence: 99%

Spatio‐temporal distribution of mutton snapper and dog snapper spawning aggregations in the South‐west Atlantic

França

Olavo

Rezende

et al. 2021

Aquatic Conservation

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1. Sites and periods of spawning aggregations of two important fishery resources, the mutton snapper, Lutjanus analis, and the dog snapper, Lutjanus jocu, were identified and validated along the Brazilian north-east coast (latitude 8-15 S) using exploratory analysis of catch per unit effort (CPUE) data, gonadosomatic index analysis, and gonad histology.2. The CPUE analysis for both species allowed the identification of outliers and far outliers, representing fisheries with exceptional catches, which were used as proxies of possible aggregation.3. The presence of pre-spawning and recent spawning signs (hydrated oocytes and post-ovulatory follicles) in the ovary of females caught at sites with recurrent records of high CPUE allowed the validation of spawning activity at those specific sites for each species. All aggregation sites identified in this study were located on

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“…In this respect, L. analis and L. jocu share biological features that favor long-distance dispersal with others lutjanid species. Among these are included the relatively long pelagic larval phase of approximately one month (Lindeman et al, 2001), high dispersive potential of adult individuals, ontogenetic habitat variation with a direct relationship between body size and depth (Frédou and Ferreira, 2005), formation of reproductive aggregations (Paris et al, 2005, França andOlavo, 2015), long life, and delayed sexual development (Claro, 1981;Allen, 1985;Graham et al, 2008).…”

Section: Population Structure Of the Mutton And Dog Snappers In Brazimentioning

confidence: 99%

Phylogeography and Historical Demography of Two Sympatric Atlantic Snappers: Lutjanus analis and L. jocu

et al. 2019

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Lutjanus analis (mutton snapper) and Lutjanus jocu (dog snapper) are mesopredator species with extensive geographic distribution in the Atlantic Ocean. Although historically overfished, their genetic diversity, population structuring, and historical demography along the Brazilian coast are unknown. Here, we present genetic data for the hypervariable region 1 (HVR1) of the mtDNA control region of both L. jocu and L. analis, and for cytB of L. analis from distinct geographic regions. Phylogeographic analyses based on HVR1 sequences revealed no geographic structuring of mtDNA lineages for either species. The bimodal mismatch distribution plots of mutton and dog snapper populations implied that they might have experienced secondary contact. Historical demographic parameters estimated that population expansions ranged from 13,631 to 61,171 years before present (ybp) for L. analis and 36,783-55,577 ybp for L. jocu, associated with events that occurred at the end of the last glaciation period. Estimates of the average effective population size for L. jocu were higher than those for L. analis, with the largest population occupying the Brazilian northeastern region coast. High migration rates are maintained among the three northernmost locations, with a substantial decrease to the further southern region. Our study suggests that a tripartite interaction of larval dispersion and interregional adult movement (aggregate spawning), allied to historical contingencies, contributed to contemporary population genetic patterns of these species, and adds relevant information for conservation management of such vulnerable -and valuable -marine resources.

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Indirect signals of spawning aggregations of three commercial reef fish species on the continental shelf of Bahia, east coast of Brazil

Cited by 15 publications

References 10 publications

Human and environmental gradients predict catch, effort, and species composition in a large Micronesian coral-reef fishery

Human and environmental gradients predict catch, effort, and species composition in a large Micronesian coral-reef fishery

Spatio‐temporal distribution of mutton snapper and dog snapper spawning aggregations in the South‐west Atlantic

Phylogeography and Historical Demography of Two Sympatric Atlantic Snappers: Lutjanus analis and L. jocu

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