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Protracted volitional spawning of pinfish Lagodon rhomboides and changes in egg quality and fatty‐acid composition throughout the spawning season
Authors:J. S. Broach  C. L. Ohs  N. E. Breen
Affiliation:1. Program of Fisheries and Aquatic Sciences, School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida, 7922 NW 71st St, Gainesville, FL 32653, U.S.A.;2. Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, 2199 South Rock Rd, Fort Pierce, FL 34945, U.S.A.;3. Department of Chemistry, Roger Williams University, One Old Ferry Road, Bristol, RI 02809, U.S.A.
Abstract:Spawning performance of pinfish Lagodon rhomboides without use of hormonal aids was monitored over an extended season. Nearly three million eggs were obtained from 75 spawns collected over a 90‐day consecutive period from a single population of four brood fish (1M:1F). A mean ± s.d. batch fecundity of 30·27 ± 22·64 eggs g?1 female was estimated with 98·0 ± 0·06% of the batch composed of floating eggs which were 1·04 ± 0·04 mm in diameter and 85·71 ± 27·59% fertile. Floating eggs successfully hatched 54·65 ± 29·13% of the time which yielded larvae that were 2·59 ± 0·24 mm in length. Fatty acids within floating eggs were largely represented by polyunsaturated fatty acids (45·30 ± 2·14% of total fatty acids) of which linoleic acid [(c18:2n‐6cis) 3·49 ± 1·69% trifluoroacetic acid (TFA)] and docosahexaenoic acid (DHA) [(c22:6n‐3) 28·47 ± 1·48% TFA] represented the majority of fatty acids for n‐6 and n‐3 polyunsaturated fatty acids, respectively. The strongest correlations between fatty acids and hatching success and larval survival to first feeding were observed for the DHA:EPA (eicosapentaenoic acid; c20:5n‐3) ratio and total n‐6 polyunsaturated fatty‐acids levels, respectively. These data demonstrate potential for producers to rely on natural spawns for extensive egg production and provide a baseline for future development of natural spawning protocols of captive L. rhomboides.
Keywords:baitfish  fecundity  hatchery  lipids  marine  reproduction
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