Predictions & Data for this entry

Model: abj climate: MA, MB, MC migrate: phylum:
COMPLETE = 2.5 ecozone: MA food: biPz class:
MRE = 0.102 habitat: 0iMp gender: Hh order:
SMSE = 0.164 embryo: Mp reprod: O family:

Zero-variate data
ah1.5 1.554 (0.03577)dage at hatchPear1991
ab 3 2.702 (0.09921)dage at birthPear1991
tp 15 15.4 (0.0266)dtime since birth at pubertyguess
am730 734.8 (0.006546)dlife spanADW
Lh0.09 0.08558 (0.04913)cmtotal length at hatchPear1991
Lb0.13 0.1263 (0.02878)cmtotal length at birthPear1991
Lp0.76 0.7632 (0.004239)cmtotal length at pubertyReev1970
Li1.2 1.29 (0.07474)cmultimate total lengthBeer1964
Ri 34 32.88 (0.033)#/dmaximum reprod ratePear1991
JX850.64 0.6414 (0.002168)mg dry weight/dingestion rate at 0.85 cmReev1964
Uni-variate data
DatasetFigure(RE)Independent variableDependent variableReference
tL see Fig. 1 (0.02951)time since birthlengthReev1970
tW see Fig. 2 (0.8318)time since birthdry weightReev1970
Pseudo-data at Tref
DataGeneralised animalFerosagitta hispidaUnitDescription
v 0.02 0.01451cm/denergy conductance
kap 0.8 0.597-allocation fraction to soma
kap_R 0.95 0.475-reproduction efficiency
p_M 18 629.3J/^3vol-spec som maint
k_J 0.002 0.0021/dmaturity maint rate coefficient
kap_G 0.8 0.8013-growth efficiency


  • protandrous hermaphrodite (testes mature before ovaries); internal fertilisation (ref: Pear1991)
  • protandrous hermaphrodite (testes mature before ovaries); internal fertilisation (ref: Pear1991)


  • length-wet weight relationship: morphology suggests length : width : height = 1 : 0.1 : 0.02
  • so V = .002 L^3, probably an over-estimation
  • Ww_i = .002 1.2^3 = 8.6 mg; Wd_i = 0.1 mg
  • shape of tW-curve strongly suggests that gonads contribute to Wd
  • Reproduction efficiency kap_R has been set to 0.95/2 because the species is simultaneous hermaphroditic


  • [Wiki]
  • [ADW]
  • [Beer1964] J. R. Beers. Ammonia and inorganic phosphorus excretion by the planktonic chaetognath, Sagitta hispida Conant. J. Cons. int. Explor. Mer, 29(2):123--129, 1964.
  • [Kooy2010] S.A.L.M. Kooijman. Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge, 2010.
  • [Pear1991] S. Pearre. Growth and reproduction. In Q. Bone, H Kapp, and A. C. Pierrot-Bults, editors, The biology of Chaetognaths. Oxford Sci Publ., Oxford, 1991.
  • [Reev1964] M. R. Reeve. Feeding of zooplankton, with special reference to some experiments with Sagitta. Nature, 201:211--213, 1964.
  • [Reev1970] M. R. Reeve. The biology of Chaetognatha i. Quantitative aspects of growth and egg production in Sagitta hispida. In J. H. Steele, editor, Marine Food Chains. Univ. of California Press, Berkeley, 1970.
  • [ReevBake1975] M. R. Reeve and L. D. Baker. Production of two planktonic carnivores (chaetognath and ctenophore) in south Florida inshore waters. Fish. Bull. (Dublin), 73:238--248, 1975.

Bibtex file with references for this entry

Bas Kooijman, 2011/11/11 (last modified by Bas Kooijman 2016/10/16)

accepted: 2015/12/07

refer to this entry as: AmP Ferosagitta hispida version 2015/12/07