Reduced exploitation is associated with an altered sex ratio and larger length at maturity in southwest Pacific (east Australian) Pomatomus saltatrix

Published on May 1, 2019in Marine Environmental Research3.445
· DOI :10.1016/j.marenvres.2019.02.012
Hayden T. Schilling2
Estimated H-index: 2
(UNSW: University of New South Wales),
James A. Smith15
Estimated H-index: 15
(UNSW: University of New South Wales)
+ 3 AuthorsIain M. Suthers36
Estimated H-index: 36
(UNSW: University of New South Wales)
Pomatomus saltatrix is an important recreational fishing species with seven major populations worldwide. The reproductive biology of the southwest Pacific Ocean (east Australian) population is uncertain, with both an extended spawning and multiple spawning periods previously hypothesised. Here we demonstrate an altered sex ratio biased towards females and a larger length at 50% maturity (L) compared to those recorded for the population 40 years ago, before comprehensive management strategies were implemented. We also report a second, previously undescribed, late-summer spawning event which was identified by analysing patterns in a gonadosomatic index across the whole population and an historical larval fish database. P. saltatrix are capable of spawning multiple times per season with estimates of batch fecundity ranging from 99,488 to 1,424,425 eggs per fish. When combined with the length frequency distribution of the population, the majority of eggs (64%) were shown to be produced by fish ≤40 cm fork length (FL). L was estimated at 30.2 and 31.5 cm FL for male and female P. saltatrix respectively, 4 cm larger than 40 years ago. The sex ratio of the population was found to have significantly shifted over the last 40 years from an equal sex ratio to a female dominated population (1.58 females:1 male). These dramatic alterations to the sex ratio and L highlights the value of monitoring the reproductive biology of exploited fish populations to ensure that management plans remain appropriate.
  • References (64)
  • Citations (0)
📖 Papers frequently viewed together
20132.78PLOS ONE
43 Citations
4 Citations
11 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
#1James A. SmithH-Index: 15
Last. Iain M. SuthersH-Index: 36
view all 22 authors...
Larval fishes are a useful metric of marine ecosystem state and change, as well as species-specific patterns in phenology. The high level of taxonomic expertise required to identify larval fishes to species level, and the considerable effort required to collect samples, make these data very valuable. Here we collate 3178 samples of larval fish assemblages, from 12 research projects from 1983-present, from temperate and subtropical Australian pelagic waters. This forms a benchmark for the larval ...
3 CitationsSource
#1Stephanie Brodie (UNSW: University of New South Wales)H-Index: 7
#2L LitherlandH-Index: 1
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 6 authors...
Understanding the processes driving species distributions is a key question in ecology, yet obtaining pertinent data for many species can be challenging. Tag-recapture data from voluntary recreational fisheries programmes is an undervalued citizen science data resource and can provide valuable observation records for data-poor species. Here, we highlight the utility of such data by compiling four tag-recapture datasets (n = 20 878 tags) to describe the movements and distribution of a piscivorous...
3 CitationsSource
#1Diego R. Barneche (Monash University, Clayton campus)H-Index: 13
#2D. Ross Robertson (STRI: Smithsonian Tropical Research Institute)H-Index: 43
Last. Dustin J. Marshall (Monash University, Clayton campus)H-Index: 41
view all 4 authors...
Body size determines total reproductive-energy output. Most theories assume reproductive output is a fixed proportion of size, with respect to mass, but formal macroecological tests are lacking. Management based on that assumption risks underestimating the contribution of larger mothers to replenishment, hindering sustainable harvesting. We test this assumption in marine fishes with a phylogenetically controlled meta-analysis of the intraspecific mass scaling of reproductive-energy output. We sh...
52 CitationsSource
2 CitationsSource
#1Hayden T. Schilling (UNSW: University of New South Wales)H-Index: 2
#2Julian M. HughesH-Index: 8
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 6 authors...
Pelagic mesopredators are abundant in many marine ecosystems and exert strong top-down influence on food webs. We explored the dietary niche of Pomatomus saltatrix in eastern Australia, using a classification tree analysis to identify key factors driving diet variation. P. saltatrix was shown to be an opportunistic generalist predator which exhibited increased baitfish consumption, and decreased crustacean consumption, with increasing size. The classification tree analysis showed that body size ...
4 CitationsSource
#1Julian M. Hughes (UNSW: University of New South Wales)H-Index: 8
#2John Stewart (UTAS: University of Tasmania)H-Index: 13
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 5 authors...
Knowledge of the influence of both spatial and temporal environmental gradients on life history traits and population demographics is a critical requirement in the management of exploited fish populations. This study examined variation in the demographics of Arripis trutta, an economically-important pelagic fish species with a broad latitudinal distribution in the waters of coastal south-eastern (SE) Australia, a region dominated by the influence of the East Australian Current (EAC). A validated...
4 CitationsSource
#1George M. LeighH-Index: 6
#2Michael F. O'NeillH-Index: 7
Last. John StewartH-Index: 1
view all 3 authors...
Tailor is a highly migratory fish with an iconic, mainly beach-based fishery on the Australian east coast. There is a pronounced annual, close-inshore run of large schools of tailor from New South Wales, where the fishery peaks in April–June, to Queensland where the Fraser Island fishery at the northern end of the run peaks in August–September. The commercial sector of the fishery developed over the first half of the 20th century while the recreational beach line sector grew strongly from the la...
2 Citations
#1Adriana Vergés (UNSW: University of New South Wales)H-Index: 22
#2Christopher Doropoulos (UNSW: University of New South Wales)H-Index: 16
Last. Peter D. Steinberg (UNSW: University of New South Wales)H-Index: 64
view all 12 authors...
Abstract Some of the most profound effects of climate change on ecological communities are due to alterations in species interactions rather than direct physiological effects of changing environmental conditions. Empirical evidence of historical changes in species interactions within climate-impacted communities is, however, rare and difficult to obtain. Here, we demonstrate the recent disappearance of key habitat-forming kelp forests from a warming tropical–temperate transition zone in eastern ...
93 CitationsSource
#1Ashley M. Fowler (New South Wales Department of Primary Industries)H-Index: 14
#2Shannen M. Smith (UTS: University of Technology, Sydney)H-Index: 3
Last. John Stewart (New South Wales Department of Primary Industries)H-Index: 13
view all 4 authors...
Abstract Partial migration affects the ecology and evolution of animal populations, and is an important consideration for the management of harvested species, yet the phenomenon is understudied in fish. We provide the first insights into partially diadromous migration of grey mullet (Mugil cephalus) in Australia by examining the otolith chemistry of old individuals (aged 7–10 years) from two regions on the east coast. Strontium and Barium concentrations were measured across the otolith using las...
16 CitationsSource
#1Anna Kuparinen (UH: University of Helsinki)H-Index: 28
#2Alice BoitH-Index: 12
Last. Neo D. Martinez (UA: University of Arizona)H-Index: 10
view all 5 authors...
Fishing is widely known to magnify fluctuations in targeted populations. These fluctuations are correlated with population shifts towards young, small, and more quickly maturing individuals. However, the existence and nature of the mechanistic basis for these correlations and their potential ecosystem impacts remain highly uncertain. Here, we elucidate this basis and associated impacts by showing how fishing can increase fluctuations in fishes and their ecosystem, particularly when coupled with ...
24 CitationsSource
Cited By0
#1Hayden T. Schilling (UNSW: University of New South Wales)H-Index: 2
#2Jason D. Everett (UNSW: University of New South Wales)H-Index: 15
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 8 authors...
Abstract The narrow-barred Spanish mackerel (Scomberomorus commerson) is an economically important fish species in Taiwan. Nevertheless, its reproductive biology in the region is poorly understood. This study provides the first information on the reproductive biology of this species in the central Taiwan Strait. In total, 1031 specimens were collected from January 2016 through August 2017, and the sex ratio (0.55) was significantly different from 0.5 (p = 0.0016). On the basis of progressive cha...