Giant trevally spawning aggregation highlights importance of community fisheries management no-take zone

Silva, Isabel Marques da; Hempson, Tessa N.; Hussey, Nigel E.

doi:10.1007/s12526-014-0235-2

“…Previous passive tracking studies indicate that giant trevally exhibit site fidelity to specific reefs over relativity long time scales (i.e., 1 to 2 years), but abandon their home ranges seasonally to undertake long distance and in some cases inter-island movements, to discrete aggregation sites presumably for reproduction (Meyer et al 2007b;Lédée et al 2015;Filous et al 2017a). Although we were unable to observe these spawning related movements in our study, giant trevally are known to form large spawning aggregations (Meyer et al 2007b;da Silva et al 2015) and the efficacy of MPA's for this species can be enhanced by incorporating these aggregation sites within their boundaries (De Mitcheson and Erisman 2012;Russell et al 2012). Collectively, this body of evidence suggests that the utility of spatial protections for giant trevally is dependent on the scale of protection and conservation objectives of the management entity.…”

Section: Discussionmentioning

confidence: 58%

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

Filous¹,

Lennox²,

Danylchuk³

et al. 2019

Preprint

0

View full text Add to dashboard Cite

<div>Giant trevally (<i>Caranx ignobilis</i>) are important predators on the reefs of the tropical Indo-Pacific and research into their spatial ecology is needed to improve our understanding of their behavior and assist fisheries management. We used active acoustic telemetry to describe the fine-scale movements of giant trevally at Tetiaroa Atoll, including their home range, site fidelity, habitat use and spatial overlap with a small (21 km2) Marine Protected Area (MPA). The home ranges of giant trevally were small but varied among individuals (Minimum Convex Polygon 𝑋𝑋 = 3.2 ± 2.5 km2). All giant trevally exhibited site fidelity to their respective home ranges with a 31% average overlap in daily space use, but there was limited overlap in home ranges among individuals, with intra-individual spatial overlap significantly greater than inter-individual overlap (t = -4.93, df = 16.87, p-value = <0.001). There was only modest overlap (19 ± 19%) of giant trevally home ranges within the MPA and high spatial overlap of home ranges with deep lagoon habitats (90 ± 0.09 %). Our results indicate that MPAs could be an effective tool for the conservation of this species if they are implemented on an atoll-wide scale. However, in the case of managing recreational catch-and-release fisheries, rotational smallscale temporal closures could be effective in regulating the angling pressure imposed upon giant trevally, provided post-release mortality is minimized. The results of this study provide the first detailed account of habitat use in this species and highlight the need for additional research on the factors contributing to the survival of caught-and-released giant trevally in predator dominated atolls, especially as their popularity as a target of recreational fisheries continues to grow, and fishing operations and agencies are faced with the need to manage their fisheries.</div>

show abstract

“…Previous passive tracking studies indicate that giant trevally exhibit site fidelity to specific reefs over relativity long time scales (i.e., 1 to 2 years), but abandon their home ranges seasonally to undertake long distance and in some cases inter-island movements, to discrete aggregation sites presumably for reproduction (Meyer et al 2007b;Lédée et al 2015;Filous et al 2017a). Although we were unable to observe these spawning related movements in our study, giant trevally are known to form large spawning aggregations (Meyer et al 2007b;da Silva et al 2015) and the efficacy of MPA's for this species can be enhanced by incorporating these aggregation sites within their boundaries (De Mitcheson and Erisman 2012; Russell et al 2012). Collectively, this body of evidence suggests that the utility of spatial protections for giant trevally is dependent on the scale of protection and conservation objectives of the management entity.…”

Section: Discussionmentioning

confidence: 64%

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

Filous¹,

Lennox²,

Danylchuk³

et al. 2019

Preprint

1

0

View full text Add to dashboard Cite

<div>Giant trevally (<i>Caranx ignobilis</i>) are important predators on the reefs of the tropical Indo-Pacific and research into their spatial ecology is needed to improve our understanding of their behavior and assist fisheries management. We used active acoustic telemetry to describe the fine-scale movements of giant trevally at Tetiaroa Atoll, including their home range, site fidelity, habitat use and spatial overlap with a small (21 km2) Marine Protected Area (MPA). The home ranges of giant trevally were small but varied among individuals (Minimum Convex Polygon 𝑋𝑋 = 3.2 ± 2.5 km2). All giant trevally exhibited site fidelity to their respective home ranges with a 31% average overlap in daily space use, but there was limited overlap in home ranges among individuals, with intra-individual spatial overlap significantly greater than inter-individual overlap (t = -4.93, df = 16.87, p-value = <0.001). There was only modest overlap (19 ± 19%) of giant trevally home ranges within the MPA and high spatial overlap of home ranges with deep lagoon habitats (90 ± 0.09 %). Our results indicate that MPAs could be an effective tool for the conservation of this species if they are implemented on an atoll-wide scale. However, in the case of managing recreational catch-and-release fisheries, rotational smallscale temporal closures could be effective in regulating the angling pressure imposed upon giant trevally, provided post-release mortality is minimized. The results of this study provide the first detailed account of habitat use in this species and highlight the need for additional research on the factors contributing to the survival of caught-and-released giant trevally in predator dominated atolls, especially as their popularity as a target of recreational fisheries continues to grow, and fishing operations and agencies are faced with the need to manage their fisheries.</div>

show abstract

“…Ages at first maturity of giant trevally and bluefin trevally were estimated at 3.5 years (~60 cm SL) and 2 years (~35 cm SL), respectively (Sudekum et al 1991). In the wild, giant trevally form seasonal mating aggregations with a peak spawning period during the summer months (Sudekum et al 1991;Meyer et al 2007;da Silva et al 2014;Daly et al 2018). Studies suggest that these spawning aggregations are influenced by lunar cycles (Johannes 1978;Meyer et al 2007;da Silva et al 2014;Daly et al 2018).…”

Section: Sexual Maturity and Reproductive Cyclesmentioning

confidence: 99%

“…In the wild, giant trevally form seasonal mating aggregations with a peak spawning period during the summer months (Sudekum et al 1991;Meyer et al 2007;da Silva et al 2014;Daly et al 2018). Studies suggest that these spawning aggregations are influenced by lunar cycles (Johannes 1978;Meyer et al 2007;da Silva et al 2014;Daly et al 2018). In spawning aggregations of giant trevally observed in the Western Indian Ocean during mid-December (da Silva et al 2014), more than 1000 fish were observed two days before the full moon.…”

Section: Sexual Maturity and Reproductive Cyclesmentioning

confidence: 99%

Reproduction of greater amberjack (Seriola dumerili) and other members of the family Carangidae

Corriero

¹

,

Wylie

²

,

Nyuji

³

et al. 2021

Reviews in Aquaculture

View full text Add to dashboard Cite

The family Carangidae contains several species of aquaculture interest, including the amberjacks, yellowtails and trevallies. Among them, the greater amberjack (Seriola dumerili), the Japanese amberjack or yellowtail (Seriola quinqueradiata) and the yellowtail kingfish (Seriola lalandi) are considered the species with the highest potential for commercial aquaculture. Understanding the reproductive physiology-biology, spawning kinetics and production characteristics in captivity are of utmost importance for the domestication of any animal, and developing broodstock management methods and therapies to optimize egg production and overcome potential reproductive dysfunctions are essential. The present article reviews the available literature on the reproductive biology of the Carangidae species of interest for the aquaculture industry, both in the wild and under farming conditions. The reproductive traits of wild and farmed fish, whenever available, were compared in order to improve the understanding of the reproductive dysfunctions occurring in captivity. Finally, the hormonal maturation and spawning induction protocols examined so far to ameliorate the reproductive dysfunctions and obtain fertile gametes are summarized, and their effectiveness in the different rearing conditions is discussed.

show abstract

Giant trevally spawning aggregation highlights importance of community fisheries management no-take zone

Cited by 7 publications

References 3 publications

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

Reproduction of greater amberjack (Seriola dumerili) and other members of the family Carangidae

Contact Info

Product

Resources

About