Rapid Reproductive Analysis and Length-Dependent Relationships of <i>Lutjanus biguttatus</i> (Perciformes: Lutjanidae) from Papua New Guinea

Longenecker, Ken; Langston, Ross; Bolick, Holly

doi:10.2984/67.2.11

Cited by 7 publications

(14 citation statements)

References 7 publications

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“…Our macroscopic evaluations were incorrect (wrong sex and/or reproductive status) for 62.6% of N. isacanthus specimens examined. Similar differences between histological and macroscopic results have been reported previously (Vitale et al 2006, Grandcourt et al 2011, Longenecker et al 2013a, 2013c. Although Mackie and Lewis (2001) report that accuracy of macroscopic staging improves as personnel gain experience, they also state that misclassification rate exceeds 40% for many gonad stages, even when workers are experienced.…”

Section: Discussionsupporting

confidence: 55%

“…We used methods modified from Longenecker et al (2013a) to describe length-weight relations, size-atmaturity, sexual pattern, sex-ratios, and length-batch fecundity relations * . The modifications were designed to decrease the total volume of fixative used in histological processing and greatly decrease the time necessary for fecundity estimates.…”

Section: Methodsmentioning

confidence: 99%

“…Visual (macroscopic) examination of gonads results in misclassification of sex and/or reproductive status in 43%-47% of specimens (Longenecker et al 2013a(Longenecker et al , 2013c. These misclassifications tend to overestimate the number of mature females (Longenecker et al 2013a(Longenecker et al , 2013c, underestimate female size-at-maturity (Grandcourt et al 2006(Grandcourt et al , 2011, and overestimate female spawning biomass (Vitale et al 2006). Additionally, histological analysis is required to diagnose sex change (Sadovy and Shapiro 1987).…”

Section: Introductionmentioning

confidence: 99%

“…The FishBase life history tool (Froese and Pauly 2016), built on the empirical relations of Froese and Binohlan (2000), increasingly overestimates female size-at-maturity as the maximum size of a species increases (Longenecker et al, 2013b, Longenecker and. Visual (macroscopic) examination of gonads results in misclassification of sex and/or reproductive status in 43%-47% of specimens (Longenecker et al 2013a(Longenecker et al , 2013c. These misclassifications tend to overestimate the number of mature females (Longenecker et al 2013a(Longenecker et al , 2013c, underestimate female size-at-maturity (Grandcourt et al 2006(Grandcourt et al , 2011, and overestimate female spawning biomass (Vitale et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…To address these challenges, Longenecker et al (2013a) developed a method for rapid, low-cost, onsite, histology-based reproductive analysis that requires minimal research infrastructure. The method has since earned the appellation "Jungle Histology", which describes the environment for which the method was developed and hints at the "guerrilla" nature of the approach.…”

Section: Introductionmentioning

confidence: 99%

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Rapid reproductive analysis and length–weight relations for five species of coral-reef fishes (Actinopterygii) from Papua New Guinea: Nemipterus isacanthus, Parupeneus barberinus, Kyphosus cinerascens, Ctenochaetus striatus (Perciformes), and Balistapus undulatus (Tetraodontiformes)

Longenecker¹,

Langston²,

Bolick³

et al. 2017

Acta Ichthyol. Piscat.

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T. 2017. Rapid reproductive analysis and length-weight relations for five species of coral-reef fishes (Actinopterygii) from Papua New Guinea: Nemipterus isacanthus, Parupeneus barberinus, Kyphosus cinerascens, Ctenochaetus striatus (Perciformes), and Balistapus undulatus (Tetraodontiformes). Acta Ichthyol. Piscat. 47 (2): 107-124.Background. We present length-weight relations (LWR) and describe the reproductive biology of five species of coral reef fishes from Papua New Guinea (PNG). Each of these species are targeted by artisanal-and smallscale commercial fisheries throughout the country. As such the purpose of this study was to provide baseline reproductive information that can be used for future evaluation and management of the fishery. Materials and methods. We used recently developed methods for rapid, low-cost, on-site, histology-based reproductive analysis that requires minimal research infrastructure. These methods use standard techniques (e.g., plastic embedding) that have been modified such that work can be conducted in remote field settings without electrical service. We studied the following fish species: the teardrop threadfin bream, Nemipterus isacanthus (Bleeker, 1873); the dash-and-dot goatfish, Parupeneus barberinus (Lacepède, 1801); the blue sea chub, Kyphosus cinerascens (Forsskål, 1775); the striated surgeonfish, Ctenochaetus striatus (Quoy et Gaimard, 1825); and the orange-lined triggerfish, Balistapus undulatus (Park, 1797). Results. In all species, length was an approximately cubic function of weight. Female B. undulatus mature at a smaller size than males; in the other four species males mature at a smaller size. Nemipterus isacanthus, K. cinerascens, C. striatus, and B. undulatus are gonochores. Females are rare or absent in the largest size classes of N. isacanthus, P. barberinus, C. striatus, and B. undulatus. For P. barberinus and B. undulatus, size classes well below maximum observed size are responsible for the majority of egg production. Conclusion. Our results differed markedly from those of macroscopic and data-deficient approaches and may help to avoid unnecessary management actions. Further, an emergent pattern challenges a current paradigm in reef-fish conservation and management; contrary to a general assumption for many reef-fish species, the largest ACTA ICHTHYOLOGICA ET PISCATORIA (2017) 47 (2): 107-124

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Section: Discussionsupporting

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rapid reproductive analysis and length–weight relations for five species of coral-reef fishes (Actinopterygii) from Papua New Guinea: Nemipterus isacanthus, Parupeneus barberinus, Kyphosus cinerascens, Ctenochaetus striatus (Perciformes), and Balistapus undulatus (Tetraodontiformes)

Longenecker¹,

Langston²,

Bolick³

et al. 2017

Acta Ichthyol. Piscat.

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Reproductive Traits of Five-Line Snapper, Lutjanus quinquelineatus (Bloch, 1790) (Actinopterygii: Perciformes: Lutjanidae), from Southern South China Sea, Malaysia

Seah,

Rahman,

Ariffin

et al. 2024

Thalassas

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Errors in estimating reproductive parameters with macroscopic methods: a case study on the protogynous blacktip grouper Epinephelus fasciatus (Forsskål 1775)

Longenecker,

Langston,

Mamesah

et al. 2024

Journal of Fish Biology

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A size‐based, histological analysis of the reproductive life history of the blacktip grouper, Epinephelus fasciatus (Forsskål 1775), was conducted in Indonesia to evaluate the error rate associated with macroscopic reproductive analysis. Histological results indicated that E. fasciatus was protogynous with female L50 at 13.4 cm total length (LT) and a size at sexual transition of 22.0 cm LT. The weight–length relationship for the species was W = 0.011 L3.13. Overall sex ratios were significantly female biased, operational sex ratios were significantly male biased, and sex ratios of mature individuals varied predictably with length from female to male dominance as size increased. No significant relationship between length and batch fecundity was found. The population has a spawning period from February to August. Overall, 54.4% of macroscopic evaluations were incorrect compared to histological results. Of the errors, 14.8% were a failure to detect ovotestes, 12.7% were classifying non‐gonadal tissue as ovary or testis, 12.2% were misclassifying sex, and 12.7% were misclassifying maturity status. However, the largest source of error (47.7%) was from misclassifying both sex and maturity status. Of these, 92.9% were macroscopically classified as immature females, but were histologically confirmed to be mature males. Compared to histological results, the only accurate macroscopic results were the absence of a sex‐based difference in weight–length relationship and spawning seasonality estimated by a gonadosomatic index (February–June). The use of macroscopic methods to estimate reproductive life‐history parameters for sex‐changing reefes fish may introduce significant inaccuracies and misinterpretations. Of the parameters estimated by histological methods, size at maturity, size‐specific sex ratios, and spawning seasonality have the greatest potential to inform local fishery management policy.

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Rapid Reproductive Analysis and Length-Dependent Relationships of Lutjanus biguttatus (Perciformes: Lutjanidae) from Papua New Guinea

Cited by 7 publications

References 7 publications

Rapid reproductive analysis and length–weight relations for five species of coral-reef fishes (Actinopterygii) from Papua New Guinea: Nemipterus isacanthus, Parupeneus barberinus, Kyphosus cinerascens, Ctenochaetus striatus (Perciformes), and Balistapus undulatus (Tetraodontiformes)

Rapid reproductive analysis and length–weight relations for five species of coral-reef fishes (Actinopterygii) from Papua New Guinea: Nemipterus isacanthus, Parupeneus barberinus, Kyphosus cinerascens, Ctenochaetus striatus (Perciformes), and Balistapus undulatus (Tetraodontiformes)

Reproductive Traits of Five-Line Snapper, Lutjanus quinquelineatus (Bloch, 1790) (Actinopterygii: Perciformes: Lutjanidae), from Southern South China Sea, Malaysia

Errors in estimating reproductive parameters with macroscopic methods: a case study on the protogynous blacktip grouper Epinephelus fasciatus (Forsskål 1775)

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