Inter-cohort growth for three tropical resources: tilapia, octopus and lobster

To select the model that allows the growth curves of juvenile and sub-adult shrimp to be described more accurately, a study was carried out in a coastal lagoon in the south of the Gulf of Mexico on the speciesFarfantepenaeus brasiliensis(Latreille, 1817) andFarfantepenaeus duorarum(Burkenroad, 1939). The data were obtained from 11 monthly samplings, taken between April 2011 and February 2012, applying the catch strategies used by the local fishermen, including the fishing gear used. The carapace length (CL)-total weight (TW) relationship was estimated for both species. Frequency analyses were performed in order to follow the best represented cohorts over time and fit three non-asymptotic growth models: Power, Generalised Schnute and the Indeterminate Tanaka model. The CL-TW relationship of juvenile and sub-adultF. brasiliensiswas TW = 3 × 10−5CL3.75and TW = 8 × 10−5CL3.50forF. duorarum, both of which presented positive allometric growth. In both species the Indeterminate Tanaka model proved to be the best fit to the modal groups of the juvenile and sub-adult shrimp due to its ability to describe the seasonal oscillations in shrimp growth.

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Model selection for determining the growth of juveniles and sub-adults of two species of shrimp (Decapoda, Penaeidae) in a tropical coastal lagoon

Monsreal-Vela

Velázquez‐Abunader

Poot-López

2016

Crustac

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Growth and Sex Ratio of Octopus Paroctopus Digueti (Perrier & Rochebrune, 1894) in a Wild Population

Granados-Alcantar

Escamilla-Montes

Diarte-Plata

et al. 2020

Croatian Journal of Fisheries

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AbstractIn Mexico, studies of octopus Paroctopus digueti are scarce, thus the objective of this research is to evaluate some of its biological aspects in Ohuira Bay, Ahome, Sinaloa, Mexico. From autumn 2016 to autumn 2017, a total of 217 organisms of P. digueti were collected, from which 166 were females, 31 ovigerous females and 20 males. The lengths of the mantle (ML), tentacles or arms (AL) and total length (TL) were recorded as well as the total weight (TW) of each organism. The software FiSAT II was used to obtain the growth parameters by mediating seasonal size frequencies. Considering both sexes, the average registered mantle length was 40.31±2.5 mm. For the analysis of ML-TL y ML-AL, the data were adjusted to a linear-type model. For the relationship between ML-TL, the minimum determination coefficient was observed during spring R2 = 0.335, and the highest was registered in winter R2 = 0.6452. With regards to the allometry coefficient (b), it was different among the 4 climatic seasons. The theoretical ML growth curve showed both sexes of ML∞= 73.50 mm, K = 1.30 year−1 and t0= 0.10. The estimated values from the growth equation revealed faster growth (ML∞= 63 mm) within the 1.2 years of their lives, reaching a maximum length at 2.5 years of age. The total weight growth curve of P. digueti octopus was formed by an exponential first stage up to six months and the second logarithmic stage from seven months to approximately 1.8 years. In the summer there were slightly lower coefficients and percentages of instantaneous growth coefficients (IGC) for the lengths and total weight of octopus P. digueti. The highest Fulton’s condition index (k) was recorded in winter. The sex ratio was significant in a proportion of 9.85 F:1 M.

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Inter-cohort growth for three tropical resources: tilapia, octopus and lobster

Cited by 2 publications

References 37 publications

Model selection for determining the growth of juveniles and sub-adults of two species of shrimp (Decapoda, Penaeidae) in a tropical coastal lagoon

Model selection for determining the growth of juveniles and sub-adults of two species of shrimp (Decapoda, Penaeidae) in a tropical coastal lagoon

Growth and Sex Ratio of Octopus Paroctopus Digueti (Perrier & Rochebrune, 1894) in a Wild Population

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