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Nauplius

On-line version ISSN 2358-2936

Nauplius vol.26  Cruz das Almas  2018  Epub June 04, 2018

http://dx.doi.org/10.1590/2358-2936e2018010 

Original Article

Growth of the burrowing crayfish Parastacus nicoleti (Philippi, 1882) (Crustacea, Decapoda, Parastacidae)

Miguel Yáñez-Alvarado 1   * 
http://orcid.org/0000-0001-5483-3428

Erich Rudolph-Latorre 2  
http://orcid.org/0000-0001-9337-5976

Jessica Orellana-Olave 1  
http://orcid.org/0000-0003-1189-4751

1 Departamento de Estadística, Universidad del Bío-Bío, Casilla 5-C, Concepción, Chile

2 Departamento de Ciencias Biológicas y Biodiversidad, Universidad de Los Lagos, Casilla 933, Osorno, Chile

ABSTRACT:

We examined the individual growth of the burrowing crayfish Parastacus nicoleti (Philippi, 1882) based on a sample of 1,425 specimens. Individuals were collected monthly from November 1981 to December 1982, in the marshy wetlands of the “Pangal” homestead in Reumen, southern Chile. The Cephalothorax Length (CL) and Body Weight (BW) were recorded for all specimens. The asymptotic length parameters (L ) and the growth coefficient (k) were established using the Gulland and Holt method (1959). The t 0 parameter was obtained through the inverse von Bertalanffy equation and the length-weight relationship was determined according to the equation proposed by Ricker (1975). The asymptotic size and weight were 45.754 mm and 18.50 g, respectively. The growth constant was 0.703/year. Estimated longevity was 4.32 years. We concluded that P. nicoleti is a relatively small species with poor growth indicators for size and weight and, consequently, is not an attractive species for commercial aquaculture purposes.

Key Words longevity; freshwater crayfish; growth parameters; asymptotic size and weight; southern Chile

INTRODUCTION

The burrowing crayfish Parastacus nicoleti (Philippi, 1882) inhabits underground waters from semimarshland areas of Chile (Rudolph, 2010; 2013). Its distribution ranges from the locality of Gorbea (39°05’S 72°38’W) (Araucanía Region) to the Chaqueihua River (41°26’S 73°06’W) (Los Lagos Region) in southern Chile (Rudolph, 2010; 2013). It burrows galleries of variable morphology in these terrains, which can reach depths of up to 2.0 m during the summer (Kilian, 1959). This species plays an important ecological role, as a keystone trophic regulator and ecological engineers in the marshy wetlands of the Cordillera de la Costa of the Los Rios and Los Lagos Regions (Rudolph and Almerão, 2015). Nevertheless, biological knowledge about this species is still scarce and fragmented. The few studies carried out have concentrated mainly on describing the burrowing behavior (Kilian, 1959), embryonic and early postembryonic development (Rudolph and Zapata, 1986), sexual system (Rudolph, 1995), burrow structure and associated physicochemical parameters (Rudolph, 1997). In spite of this lack of knowledge, some authors have classified this species according to the conservation categories established by the IUCN (2012) considering, for this purpose, the degradation of its natural environment due to anthropic action, as the main threat to its conservation. Thus, Bahamonde et al. (1998) and Rudolph and Crandall (2005; 2007) classified it as Vulnerable (VU); Buckup (2010) and Almerão et al. (2015) as Data deficient (DD); and the Ministerio del Medio Ambiente de Chile (MMA, 2013) (Ministry of the Environment), as Least Concern (LC). These different categorizations reveal the need for additional studies, especially with regard to the population ecology and reproductive biology in order to achieve a more precise evaluation. In this way, it will be facilitated the progress in terms of implementing efficient of conservation measures.

Knowledge about the individual growth of a species is of transcendental importance to estimate population size more accurately (Arreguín et al., 1991). Furthermore, it is indispensable when determining the commercial culture viability of a given species (Lobão et al. 1987), and fundamental to the design of opportune and efficient management, protection and conservation strategies (Rodríguez and Bahamonde, 1986; Wright-López et al., 2009). Taking this into account, the aim of study is to characterize the individual growth of P. nicoleti, based on measurements of length and weight, using the biological growth model of von Bertalanffy (1938).

MATERIALS AND METHODS

Sampling

The P. nicoleti specimens were collected with a manual suction pump applied directly over the entrances to their burrows in the marshy wetlands of the “Pangal” homestead (39°59’S 72°52’W), located in the locality of Reumén, province of Valdivia, Los Ríos region, southern Chile. Monthly samples were taken from November 1981 to December 1982, at 14 different points, one for each sampling. The animals captured were deposited in plastic bags and fixed in 70% ethanol for subsequent identification and analysis in the laboratory, using the morphological characters described by Ribeiro and Araujo (2017). The cephalothorax length (CL) of each specimen was measured in millimeters, from the distal end of the rostrum to the posterior margin of the carapace, and wet body weight (W) was recorded in grams, after leaving specimens to drain for three minutes on filter paper. In both types of recording, the sex of the individuals was indistinguishable, since P. nicoleti is a partial protandric hermaphrodite species with six gonopore patterns (Rudolph, 1995), making it difficult to distinguish the sex of its representatives externally.

Length-weight relationship

The length-weight relationship was determined applying the equation proposed by Ricker (1975): W = aL b where W is weight in grams, L is length of the cephalothorax in millimeters and b is the allometric growth constant. The parameters a and b were estimated by the weighted least squares (WLS) method using the SPSS v. 19 program, prior to linearization of the model through logarithmic transformation.

Growth parameters

Estimation of growth was based on analysis of the frequency distribution of cephalothorax length, identifying age groups using the Bhattacharya’s method (Bhattacharya, 1967) of the FiSATT II program (Gayanilo et al., 2005). First, the growth coefficient k and the asymptotic length (L ) were estimated using the Gulland and Holt (1959) method, that served as a basis for estimating theoretical age t o, according to the von Bertalanffy (1938) equation as follows:

ln(1LtL)=k t0+k t

The Taylor equation (1958) was used for calculation of longevity:

tmax=t0+3k , where t max is the maximum age or time required to reach 95% of the asymptotic length (L ). The asymptotic weight is estimated according to the expression proposed by Csirke (1980): W=aLb , where W is the asymptotic weight or average maximum weight.

Once the L , W , k and t 0 are estimated, the growth curves in length and in weight were determined, adjusted to the von Bertalanffy model (1938), according to the models

Lt=L(1ek(tt0)) and Wt=W(1ek(tt0))b , respectively.

RESULTS

A total of 1,425 individuals were collected; the CL of 1,178 specimens ranged from 2.4 to 46.0 mm (247 specimens were discarded because of fractures in their carapace) and the body weight of all 1,425 individuals ranged from 0.01 to 20.07g (Tabs, 1, 2). In Tab. 1, we observe that the relative dispersions in size of the specimens caught fall within a range of 0.278 to 0.421, where the lowest and highest relative dispersion is produced in those specimens caught in November 1981 and January 1982, respectively. On the other hand, in Tab. 2, the weights recorded during the study period exhibit high relative variability, presenting values that differ significantly from the averages. The asymptotic length estimated by the growth curve (45.75 mm) was very similar to the CL of the largest specimen measured (46.0 mm).

Table 1 Cephalotorax length (CL) monthly average (mm) of the Parastacus nicoleti specimens. 

Month Year n Min - Max Mean SD CV
November 1981 52 13.7 - 40.0 21.917 6.0868 0.278
December 1981 70 2.4 - 41.4 19.970 5.5975 0.280
January 1982 55 8.2 - 40.0 19.873 8.3750 0.421
February 1982 32 10.0 - 41.7 18.750 6.6005 0.352
March 1982 56 12.4 - 42.0 22.871 6.8950 0.301
April 1982 77 13.3 - 43.8 23.047 6.4920 0.282
May 1982 112 10.0 - 46.0 22.760 6.9150 0.304
June 1982 101 12.2 - 45.7 24.526 8.0336 0.328
July 1982 127 10.5 - 42.8 20.457 7.4319 0.363
August 1982 102 10.8 - 43.0 21.951 8.4211 0.384
September 1982 101 12.9 - 43.3 24.988 9.3646 0.375
October 1982 87 12.4 - 40.8 25.982 7.8921 0.304
November 1982 146 8.7 - 40.0 20.573 7.0924 0.345
December 1982 61 10.4 - 40.2 20.782 8.1874 0.394
Global 1,179 2.4 - 46.0 22.226 7.7610 0.349

SD= stardard deviation

CV= coefficient of variation

Table 2 Average monthly weight (g) of the Parastacus nicoleti specimens. 

Month Year n Min - Max Mean SD CV
November 1981 65 0.05 - 14.75 2.395 2.8008 >1
December 1981 116 0.03 - 14.30 1.465 2.0118 >1
January 1982 74 0.05 - 14.80 1.648 2.6334 >1
February 1982 33 0.19 - 15.48 2.000 2.8276 >1
March 1982 78 0.04 - 16.73 2.218 3.1371 >1
April 1982 89 0.04 - 17.03 2.672 3.3536 >1
May 1982 120 0.05 - 17.38 2.911 2.9965 >1
June 1982 108 0.02 - 20.07 3.485 3.7599 >1
July 1982 136 0.05 - 15.62 2.373 2.8642 >1
August 1982 138 0.01 - 16.33 2.587 3.4905 >1
September 1982 143 0.01 - 18.84 3.265 4.6800 >1
October 1982 83 0.39 - 15.15 5.019 4.0044 0.798
November 1982 174 0.05 - 12.86 2.055 2.7584 >1
December 1982 68 0.14 - 11.57 2.270 2.9365 >1
Global 1,425 0.01 - 20.07 2.614 3.3633 >1

SD= stardard deviation

CV= coefficient of variation

Length-weight relationship

The size-weight relationship can be observed in Fig. 1, showing greater concentration in the lower values. The intercept of the linearized model is statistically significant for this curve (| t | = 71.17; p < 0.01), as is the slope of the model (| t | = 76.51; p < 0.01); thus, the length-weight relationship is established as W=0.00021 L 2.97. The value of the slope (b = 2.97) indicates an approximately isometric growth (Hartnoll, 1982), denoting that, as the individuals grow, their body proportions are maintained.

Figure 1  Size-weight relationship of the burrowing crayfish Parastacus nicoleti

Growth parameters.

The asymptotic length and growth coefficient estimated according to the Gulland and Holt (1959) method were L = 45.754 mm and k = 0.703 /year, respectively. Subsequently the theoretical age obtained employing the von Bertalanffy method was t o= 0.055 years. The longevity or maximum age (t max) calculated was 4.32 years. The asymptotic weight (W ) was obtained using the estimated parameters of the size-weight relationship and the estimated asymptotic length (L ), obtaining the value of W = 18.50 grs.

The estimated models of size and weight were, respectively,

Lt=45.754(1e0.703(t0.055)) and Wt=18.50(1e0.703(t0.055))2.97 .

DISCUSSION

The estimated length-weight proportion indicated that growth ofP. nicoletiis isometric (b≈3.0). The same pattern was found for Parastacus pugnax (Poeppig, 1835) (b≈3.0) (Ibarra and Arana, 2012) and for males of Samastacus spinifrons (Philippi, 1882) (b=3.0) (Bocic et al., 1988). However, females of S. spinifrons showed negative allometry in growth (Bocic et al., 1988).   

The increase in length (K) estimated for P. nicoleti was higher than in other astacid and parastacid crayfishes from cold waters, except for Austropotamobius torrentium (Schrank, 1803) (see Tab. 3). In fact, this parameter is only comparable to the increase in length calculated for a species inhabiting warmer waters which has significant commercial importance, as the North American cambarid Procambarus clarkii (Girard, 1852)(Anastacio and Marques, 1995; Streissl and Hödl, 2002; Chiesa et al., 2006; Scalici and Gherardi, 2007). However, the value of the asymptotic cephalothorax length for P. nicoleti is below the value estimated for all the species of crayfish whose individual growth parameters are presented in Tab. 3, with the exception of Parastacus defossus Faxon, 1898 (Noro and Buckup, 2009) and P. brasiliensis (von Martens, 1869) (Fries, 1984). These data suggest that P. nicoleti would be a relatively small species, with a rapid increase in length, at least prior to reaching between 20 and 30 mm CL (Fig. 2). Within this size range, the reproductive processes of P. nicoleti females would begin and, consequently, energy is diverted towards these processes and somatic growth slows down. According to Rudolph (1995), the puberty moult in P. nicoleti would occur between 20 and 25 mm CL, sizes that would be reached - according to the growth model of this species - after a period of between 318.6 and 430.6 days. Furthermore, the smallest size recorded for an ovigerous female was 29.2 mm CL (Rudolph (1995).

Table 3  Individual growth parameters of some crayfish species.  

Family Specie L∞ (mm) K mm/year Sex Method References
Astacidae Aa 68.14 0.25 Both GHM Cukerzis (1979)
Aa 70.24 0.23 Both GHM Cukerzis (1989)
Ap 45.60 0.26 Female GHM Pratten (1980)
54.20 0.21 Male GHM
Ap 87.40 0.33 Female GHM Neveu (1996)
105.40 0.30 Male GHM
Ap 96.80 0.51 Female GHM Rallo and García-Arberas (2000)
201.40 0.47 Male GHM
At 88.60 0.84 Female GHM Streissl and Hödl (2002)
102.40 0.81 Male GHM
Cambaridae Pc 56.00 0.68 Both GM-MS Anastacio and Marques (1995)
Pc 62.00 0.23 Both GM-MS Fidalgo et al. (2001)
Pc 64.30 0.70 Female GM-MS Chiesa et al. (2006)
63.30 0.66 Male GM-MS
Pc 65.50 0.69 Female GM-MS Scalici and Gherardi (2007)
62.60 0.62 Male GM-MS
Pc 74.60 0.32 Female ELE Scalici et al. (2010)
68.30 0.33 Male ELE
Parastacidae Cq 66.70 0.27 Both GM-MS Beatty et al. (2005)
Pb 42.89 0.002 Both GM, LR Fries (1984)
Pb 57.37 0.23 Both GM-MS Fontoura and Buckup (1989)
Pd 30.98 0.0026 Both GM, LR Noro and Buckup (2009)
Pp 59.50 0.334 Both ELE-MR del Valle (2002)
Pp 55.90 0.35 Both GHM-MR Ibarra and Arana (2011)
Pp 55.30 0.23 Both MPA-MS Ibarra and Arana (2012)
Pn 45.75 0.703 Both GHM-MS In this study

Aa, Astacus astacus (Linnaeus, 1758); Ap, Austropotamobius pallipes (Lereboullet, 1858); At, Austropotamobius torremtium (Schrank, 1803); Pc, Procambarus clarkii (Girard, 1852); Cq, Cherax quinquecarinatus Gray, 1845; Pb, Parastacus brasiliensis (von Martens, 1869);Pd, Parastacus defossus Faxon, 1898; Pp, Parastacus pugnax (Poeppig, 1835); Pn, Parastacus nicoleti (Philippi, 1882). GM: Growth Model, MR: Mark-Recapture , LR: Laboratory rearing , MS: Monthly Samples, GHM: Gulland and Holt´s (1959) method, ELE: ELEFAN , MPA: Modal progression analysis.

Figure 2  Length growth curve of the burrowing crayfish Parastacus nicoleti adjusted to the von Bertalanffy (1938) model. 

Although the size and commercial weight of crayfish species that are successfully cultured worldwide vary considerably, in general, for a species to be considered attractive for human consumption, it must present a minimum size of 9 cm total length and weigh around 25 g (Huner and Lindqvist, 1995). The ideal weight should be around 40 g (Pérez et al., 1997). According to our results, P. nicoleti would not be considered an attractive species for commercial aquaculture purposes because it would take four years to reach a size of approximately 43 mm CL (which corresponds to 90 mm total length) and, even then, its total body weight would only be 15.3 g (Figs. 2, 3). These sizes and weights are reached by two, cold water species commonly cultured in Europe, Astacus astacus (Linnaeus, 1758) and Pacifastacus leniusculus (Dana, 1852), in only two years (Ackefors, 2000). Furthermore, two Chilean species with a certain degree of commercial potential, S. spinifrons and P. pugnax are capable to reach 30 g weight in 3 years (Rudolph et al., 2010; Ibarra and Arana, 2011).

Figure 3  Weight growth curve of the burrowing crayfish Parastacus nicoleti adjusted to the von Bertalanffy (1938) model. 

On comparing the growth parameters of the two Chilean species of Parastacus Huxley, 1879, it was verified that P. nicoleti reaches the asymptotic size in less time than P. pugnax. Furthermore, both species would reach 40 mm CL at approximately three years of age. However, from this size onwards, the increase in length of P. pugnax greatly exceeds that of P. nicoleti (Fig. 4). Furthermore, P. pugnax would reach a weight of approximately 20 g (age = 2.5 years) and of 40 g (age = 4 years). According to our results, P. nicoleti is not capable to reach these weights during its life cycle (Fig. 5).

Figure 4  Comparison between length growth curves of Parastacus nicoleti and Parastacus pugnax adjusted to the von Bertalanffy (1938) model. 

Figure 5  Comparison between weight growth curves of Parastacus nicoleti and Parastacus pugnax adjusted to the von Bertalanffy (1938) model. 

Our results suggest that P. nicoleti lives 4.32 years, similar to many other decapods (75.1%) whose life span fluctuates between 1 and 10 years (Vogt, 2012). Nevertheless, P. nicoleti longevity is relatively short when compared to many species of Parastacidae that inhabit cold waters within the galleries and reach an average maximum age of 25.6 years (McLay and van den Brink, 2016). Thus, the short life span of P. nicoleti appears somewhat enigmatic, since this species is also a primary burrower that inhabits cold waters with an average temperature of 12.1oC (maximum of 17.5oC; minimum of 8.5oC) (Rudolph, 1997). On the other hand, this concurs with the longevity estimated for other species of Parastacus, such as P. defossus and P. brasilensis (Tab. 4). Like P. nicoleti, these species are not subject to extraction for commercial purposes and occupy similar habitats with comparable life styles, although at lower geographic latitudes (Fries, 1984; Noro and Buckup, 2009).

Table 4 Longevity of some crayfish species. 

Family Species Longevity (years) References
Astacidae Al 7.4 Deval et al. (2007)
Aa > 10 Skurdal and Taugbol (2002)
Pl 16.7 Belchier et al. (1998)
Cambaridae Pc 1-1.5 Reynolds et al. (1992)
Cs 1.5 Walls (2009)
Cambaroididae Cj 11.0 Kawai et al. (1992)
Parastacidae Cqa 3.0 Sheehy (1992)
Pd 3.3 Noro and Buckup (2009)
Pn 4.3 In this study
Pb 4.3 Fries (1984)
Pp 8.9 Ibarra and Arana (2011)
13.6 Ibarra and Arana (2012)
Ag 60.0 Lukhaup and Pekny (2008)

Al, Astacus leptodactylus Eschscholtz, 1823; Pl, Pacifastacus leniusculus (Dana, 1852); Cs, Cambarellus shufeldtii (Faxon, 1884); Cj, Cambaroidesjaponicus (de Haan, 1841); Cqa, Cherax quadricarinatus (von Martens, 1868); Ag, Astacopsis gouldi Clark, 1936. Other abbreviations see Tab. 3.

The freshwater crayfish (Astacoidea and Parastacoidea) are characterized by their direct development, with incubation of large eggs, rich in vitellus, hatching at juvenile stage 1, parental care up to juvenile stage 2 and release in juvenile stage 3 (Vogt, 2013). Rudolph (1986) describes the external morphology of these three stages of early post embryonic development in P. nicoleti, and records their CL. Thus, the first juvenile measures on average 2.6 mm, the second 3.2 mm and the third 3.8 mm. If the growth model of this species is employed, estimated ages of the juveniles 1, 2 and 3 would be approximately 51, 58 and 65 days, respectively. These ages differ from the data provided by Rudolph (1986) who verified that, at water temperatures of between 6.0 y 18.0° C (x=13.9° C), hatching occurs 65 days after laying, juvenile 2 emerges after 110 days and juvenile 3 at 134 days. These differences can probably be attributed to the effect of temperature. There is a lot of evidence supporting the belief that growth of crustaceans is related to water temperature (Kawai et al., 1997; Hartnoll, 2001; Reynolds, 2002; McLay and van den Brink, 2016) and that there is a negative correlation between temperature and time taken to reach a given stage in the life cycle (Pinheiro and Taddei, 2005).

Finally, taking into account that P. nicoleti: 1. is a burrowing species with a poorly developed pleon and, consequently has a low meat yield; 2. presents low growth rates, we conclude that it would not be an attractive species for commercial aquaculture purposes.

ACKNOWLEDGEMENTS

We are grateful to the Vicerrectoría de Investigación y Postgrado of the Universidad de Los Lagos for financing the sampling process and to Susan Angus for translating the manuscript.

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1This article is part of the special series offered by the Brazilian Crustacean Society in honor to Ludwig Buckup in recognition of his dedication and contributions to the development of Carcinology

2Guest Editors: Alessandra Angélica de Pádua Bueno and Sandro Santos

Received: August 05, 2017; Accepted: February 21, 2018

*Corresponding author: Miguel Yáñez-Alvarado. E-mail: myanez@ubiobio.cl

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