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Notes on the Diet and Egg Clutches of the Pirate Perch (Aphredoderus Sayanus) from Central Arkansas
Malcolm L. McCallum

Southeastern Naturalist, Volume 11, Issue 3 (2012): 543–545

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Notes on the Diet and Egg Clutches of the Pirate Perch (Aphredoderus Sayanus) from Central Arkansas Malcolm L. McCallum* Abstract - Aphredoderus sayanus (Pirate Perch) is a widespread species whose life history is the subject of only a few studies. I recorded life-history data from a small sample of Pirate Perch collected from an intermittent stream in midcontinental highlands of Arkansas (Batesville, Independence County) on 30 June 2004. Our small sample suggests variation in prey consumption rates between sexes during the breeding season and in allocation to reproduction among females. Our survey confirmed that Pirate Perch from Arkansas have similar insectivorous diets to those reported from other regions. Information about the life histories of species provides vital information for their management and conservation (Bury 2006, McCallum 2003, McCallum and McCallum 2006). Life-history information is sparse for Aphredoderus sayanus (Gilliams) (Pirate Perch) in Arkansas (Robison 1988). I examined diets and reproductive traits from a sample of Pirate Perch from a small stream in central Arkansas. Generally, we expect geographical variation in life-history characteristics (Berven and Gill 1983), such that understanding of trait space requires examination across a species’ range. The Pirate Perch is a small, laterally compressed fish found in streams of the southern and central United States (Burr et al. 1991). This fish prefers sites with benthic debris along under-cut banks, especially in slow-flowing waters (Monzyk et al. 1997). Pirate Perch spawn in underwater root masses, and are not known to exhibit extensive parental care (Fletcher et al. 2004), despite previous studies that suggested that the species held eggs in the brachial chamber (Poly and Wetzel 2003). Spawning takes place in South Carolina from January–April (Rohde et al. 2009), May in Illinois (Forbes and Richardson 1920), and from February–March in Louisiana’s Atchafalaya River Basin (Fontenot and Rutherford 1999). The embryonic development was previously described by Martin and Hubbs (1973). In Arkansas, they breed from May–June, but little is known about its breeding ecology (Robison 1988). A study conducted in North Carolina showed that the lifespan of Pirate Perch is up to 4 years, and that there is no sexual dimorphism (i.e., for total length-weight relationships; Shepherd and Huish 1978). Dietary items in North Carolina included Cladocera, larval Diptera, Isopoda, and Amphipoda (Shepherd and Huish 1978). In Illinois, nearly half of dietary items were Chironomus and Corethra spp., with the remainder being nymphs of Ephemeroptera, aquatic Hemiptera, larval Coleoptera, aquatic Lumbriculus, Entomostraca, and occasional amphipods and isopods (Forbes and Richardson 1920). In Virginia, diets were also primarily composed of aquatic insects (Flemer and Woolcott 1966). A sample of nine Pirate Perch was collected with dipnets from a small, unnamed roadside intermittent stream on 30 June 2004 as part of a classroom exercise. Specimens were weighed, and dissected for sex determination. Ovaries and stomach contents were removed, weighed, and the eggs counted and measured with a micrometer. Fishes were aged via biochronology using scale annuli (Murphy and Willis 1996). Dietary items were identifi ed to the lowest possible taxonomic resolution and enumerated. *Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri at Kansas City, 5007 Rockhill Road, Kansas City, MO 64110; Notes of the Southeastern Nat u ral ist, Issue 11/3, 2012 543 544 Southeastern Naturalist Vol. 11, No. 3 There was little size difference between the males (n = 4) and females (n = 5), although females weighed slightly more than males (Table 1). Males had more food in their stomachs than females (Table 1), with 88.9% of the specimens having full stomachs. (Table 2). The mean mass of the stomach contents was 0.056 g (SE = 0.016). Palaemonetes paludosus (Gibbes) (Grass Shrimp) occurred in 67% of stomachs, and accounted for 28.5% of dietary items among individuals. Trichopterans were in 55.6% of stomachs and comprised 57.1% of dietary items identified. Chironomids were recovered from 22.2% of stomachs, and accounted for 4.8% of prey. We recovered one specimen each of Zygoptera, Amphipoda, and Odonata, and a fish scale (11.1% of stomachs). Body mass - age relationships matched those of previous studies. Dietary data for Pirate Perch in this study showed a diverse diet composed primarily of small benthic invertebrates, suggesting that the diets of Pirate Perch in central Arkansas are comparable to those observed in other regions. The only major difference was the large numbers of Grass Shrimp in my samples. These have not previously been reported in Pirate Perch, Table 1. Mean values for nine life-history and dietary traits with their accompanying standard error (±). Standard Total Body Mass of Mass of Egg Number of Mass of Age length length mass egg egg diameter eggs per stomach Sex (years) (mm) (mm) (g) Clutch (g) (g) (mm) clutch contents All 1.22 64.2 74.6 5.22 - - - - 0.056 (± 0.15) (± 2.2) (± 2.8) (± 0.72) (± 0.016) Males 1.0 62.3 72.0 5.34 - - - - 0.079 (± 0.0) (± 4.4) (± 6.0) (± 1.71) (± 0.035) Females 1.4 65.8 76.6 5.13 0.139 0.007 1.00 30.4 0.037 (± 0.25) (± 2.1) (± 1.9) (± 0.33) (± 0.054) (± 0.004) (± 0.21) (± 16.1) (± 0.007) Table 2. Dietary components observed in nine Pirate Perch from central Arkansas. Fish no. Dietary item Quantity % of total 1 Palaemonetes paludosus 1 100 2 Empty - - 3 Palaemonetes paludosus 1 100 4 Palaemonetes paludosus 3 100 5 Trichoptera 12 92.3 Zygoptera 1 7.7 6 Trichoptera 1 33.3 Chironomida 1 33.3 Fish scales 1 33.3 7 Trichoptera 5 83.3 Palaemonetes paludosus 1 1.7 8 Isopoda 4 57.1 Palaemonetes paludosus 1 14.2 Amphipoda 1 14.2 Trichoptera 1 14.2 9 Palaemonetes paludosus 5 41.7 Trichoptera 5 41.7 Chironomida 1 8.3 Odonata 1 8.3 Total 42 - 2012 Southeastern Naturalist Notes 545 despite the fact that Grass Shrimp and Pirate Perch co-occur. All females in this study had eggs, but the allocation to reproduction was varied. In the future, investigators should observe mating and nesting behavior for this solitary fish. I am hopeful that this limited dataset will fill in some missing links in the life history of this interesting species. Literature Cited Berven, K.A., and D.E. Gill. 1983. Interpreting geographic variation in life-history traits. Integrative and Comparative Biology 23(1):85–97. Burr, B.M., A. C. Pertschuk, L.M. Page, E.C. Beckham, W.N. Eschmeyer, and R.T. Peterson. 1991. A Field Guide to Freshwater Fishes: North America North of Mexico. Houghton Mifflin, Boston, MA. 432 pp. Bury, R.B. 2006. Natural history, field ecology, conservation biology, and wildlife management: Time to connect the dots. Herpetological Conservation and Biology 1(1):56−61. Flemmer, D.A., and W.S. Woolcott. 1966. Food habits and distribution of the fishes of Tuckahoe Creek, Virginia, with special emphasis on the Bluegill, Lepomis m. macrochirus Rafinesque. Chesapeake Science 7(2):75−89. Fletcher, D.E., E.E. Dakin, B.A. Porter, and J.C. Avise. 2004. Spawning behavior and genetic parentage in the Pirate Perch (Aphredoderus sayanus), a fish with an enigmatic reproductive morphology. Copeia 2004:1−10. Fontenot, Q.C., and D.A. Rutherford. 1999. Observations on the reproductive ecology of Pirate Perch Aphredoderus sayanus). Journal of Freshwater Ecology 14(4):545−550. Forbes, S.F., and R.E. Richardson. 1920. The Fishes of Illinois, 2nd Edition. State of Illinois, Division of the Natural History Survey, Urbana, IL. 357 pp. Martin, F.D., and C. Hubbs. 1973. Observations on the development of Pirate Perch, Aphredoderus sayanus (Pisces: Aphredoderidae), with comments on yolk circulation patterns as a possible taxonomic tool. Copeia 1973:377−379. McCallum, M.L. 2003. Reproductive ecology and taxonomic status of Acris crepitans blanchardi, with additional investigations on the Hamilton and Zuk hypothesis. Unpublished Ph.D. Dissertation. Arkasnas State University, Jonesboro, AR. 150 pp. McCallum, M.L., and J.L. McCallum. 2006. Publication trends of natural history and field studies in herpetology. Herpetological Conservation and Biology 1(1):62−67. Monzyk, F.R., W.E. Kelso, and D.A. Rutherford. 1997. Characteristics of woody cover used by Brown Madtoms and Pirate Perch in Coastal Plain streams. Transactions of the American Fisheries Society 126:655−675. Murphy, B.R., and D.W. Willis. 1996. Fisheries Techniques, 2nd Edition. American Fisheries Society, Bethesda, MD. 732 pp. Poly, W.J., and J.E. Wetzel. 2003. Transbranchioral spawning: Novel reproductive strategy observed for the Pirate Perch, Aphredoderus sayanus (Aphredoderidae). Ichthyological Exploration of Freshwaters 14(2):151−158. Robison, H.W. 1988. Fishes of Arkansas. University of Arkansas Press, Fayetteville, AR. 536 pp. Rohde, F.C., R.G. Arndt, and J.W. Foltz. 2009. Freshwater Fishes of South Carolina. University of South Carolina Press, Columbia, SC. 430 pp. Shepherd, M.E., and M.T. Huish. 1978. Age, growth, and diet of the Pirate Perch in a Coastal Plain Stream of North Carolina. Transactions of the American Fisheries Society 107:457−459.